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ZeroZone TPA3255 separate mono speaker amplifier set - surprise, surprise!

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Summary

Core Theme

This review details the Zero Zone TPA5255-based monoblock amplifiers, highlighting their exceptional sound quality, surprising power efficiency, and impressive performance, especially considering their affordable price point.

Mind Map

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คลิกเพื่อสำรวจ Mind Map แบบอินเตอร์แอคทีฟฉบับเต็ม

hi guys today I wanted to tell you about zeroone

zeroone

monoblock d-class TPA based TPA

5255 uh based uh monoblocks uh with

dedicated power supply uh that I got a

few weeks ago uh before I'll go into the

SPs uh just a short story why these ones

uh well I was exchanging messages with

the guys I got um my dzil clone from uh

and later on I also got by their

recommendation musical Fidelity A1 clone

uh and I was wondering uh if there is uh

any kind of amplifier that would be not

an obvious choice because of the brand

of the Clone uh that they would

recommend something that they know that

just sounds good something that they

would recommend uh to their friends

their family or something like that uh

and uh Kevin from fenya told me about

this small gem uh small because it

weighs only 5 kilos in total uh these

are two monoblocks and dedicated power

supply uh these are produced by Zero

Zone uh sometimes called I don't know

why but uh the name also um happens to

be in the AliExpress uh offers uh gzl

O Zone gzl Zone Zone I don't know but

the pcbs are branded Zero Zone uh this

brand from what I've seen produces

mostly uh do it yourself stuff uh like

uh PCB boards like do to yourself kits for

for

amplifiers uh like uh some pre-made um

power supplies etc etc uh

so uh they weren't exactly cheap but

they weren't also expensive they were

$400 delivered uh here to Europe and uh

they had this very strong recommendation

so I decided to beat the bullet and just

buy them uh okay

so uh let's start with the specs uh

these are as I said Texas Instruments uh TPA

TPA

5255 based monoblocks uh

50255 is working in BTL mode here and

according to the specification they are

able to reach uh 300 watts per channel

into 4 Ohms yes uh or 180 watts into 8

ohms uh what was very interesting for me

because you know I'm still looking for

the amplifiers that uh will be able to

uh drive my Martin Logans best uh these

are also supposed to be able to deliver

600 watts into two ohms uh these two

ohms are interesting for me because

Martin Logan asked and one electrostat

speakers uh in the trouble region are

dropping uh to as low as 1.2 uh oh so

they are quite difficult load uh okay uh

these two have dedicated power supply

and dedicated power supply is said to be

able to deliver a watts of power this is

a switching power supply it's not linear

power supply uh but uh the producer uh

said that this one uh is the best uh

matching uh

monoo um okay I won't uh tell you about

uh I won't tell you and I won't show you

the box it comes in in a usual cardboard

box uh with generous amount of phone

inside uh I've read a story

uh because these are basically offered

by just three shops on AliExpress uh and

in two of them uh there's a story

telling that the designer from zerozone

went to Hong Kong Hong Kong audio for a

couple of years ago and then he heard

the digital amplifier that costed

something like

$111,000 and this digital amplifier uh

didn't sound digital at all uh so he

decided to try to design something

similar uh back home and uh apparently

at least that's what they say they

contacted uh local branch of Texas

Instruments and uh they decided to use

52 uh

5255 uh integrated declass amplifier but

the uh schematics the PCB are not uh

following uh the recommendations these

are not the stock designs from Texas

Instruments that you can find in uh 5255 white

white

papers uh okay uh since left and right

channels are exactly the same I move one

to the

side and uh I'll tell you what's inside

of each of these boxes uh the amplifiers

are coming with set of uh power cables uh

because starting from the

power supply the power supply is using

Automotive 24 volts uh connectors so

you're getting two wires to connect two

channels to your power

source uh on the outside we have a power

socket we have integrated fuse

compartment here and we have two

connectors for left and right channels

as you can see you can get this one into

two flavors for 115 volts uh and

230 volts uh in the front of the power

supply we have only the power on button

the button uh lights up in Blue uh when

the um Power is switched on uh the case

the case is solid

aluminum it's pretty thick as you can

see yeah that was nice uh all three

cases are exactly the same size so they

match properly and you can stack them or

place them side by side and they look

very nice and what do we have uh inside

we have a switching power supply uh we

have capacitors for the power switching

power supply these are nepon chemical uh

capacitors so uh not the best uh not the

worst just fine for the power supply

though there is a room for improvement

you can uh replace them with something

better if you like in a

future uh other than that nothing uh

special to uh mention just a regular

switching power supply although as you

can see uh they've paid attention to

rooting the wires there is no mess

inside it's everything cleanly and

neatly connected and

placed um you can get this uh power

supply board separately in a few of uh

AliExpress shops km p800 version

1.3 okay that's there is a sign I don't

know if that's the brand name it says

calming calming like km probably

probably

um okay that's it about uh the power

supply now let's talk about the

monoblocks in front of each one of them

you have a power Le indicating the

status of the applifier and there's also

a print on the case stating that these

are TPA 5255 mono split class D digital power

power

amplifiers uh on the back on the back

there is a few interesting things

happening uh the first one is exceler

inputs uh these are available in FCA and

XLR input flavors uh when ordering you

have to specify whenever you want

single-ended or balanced uh version uh

the speaker

terminals as you can see these are not

your regular small and cheap uh speaker

terminals that you can find on uh 99% of

TPA based uh

amplifiers uh though again there's still

some room for

improvement for replacing them with uh

pure copper ones or something like that

that

inside what we can see

here uh starting from this way up okay

again we see nepon chemical uh

capacitors as a power reserve for the

power amplifier uh these are uh 300 yes 3,00

3,00

300 uh microfarads each they are rated

for 50 volts uh and uh yes I think I

will be replacing them with something

better though the rest of the capacitors

here are really really nice these are

nichon Muse and nichon gold cious uh

electrolytic capacitors so quite nice um

the stock configuration of this power

amplifiers uh includes Texas

Instruments uh NE

5552 operational amplifiers uh but

that's basically the first thing I

always replace with something better uh

I will tell you uh more about opam

selection for these amplifiers a little

bit later on as you can see the PCB is

marked with Zero Zone Zero Zone and the

note in circle logo and it says 300 wats

power amp

uh another interesting thing here is

that if you take a look if you can see

that uh the balanced connection all

three uh wires from balanced connections

Balan collection are soldier at here

into the input of the amplifier and uh

as you'll follow the tracks and the

elements on the PCB uh you'll see that

this is basically fully balanced

construction the input from XLR uh is

not converted to

single-ended uh which is good and that's

why I would recommend you always to go

with XLR

version uh then we have a very nice blue

heat syn over the amplifier chip uh we

won't be able to see the amplifier chip

underneath this head syn uh when I was

doing my listening sessions the heat

sync was better

warm to the touch so I didn't bother to

measure the temperature with my laser

meter uh because it was barely warm it

was like I don't know 20° centigrate

most uh then we are able to see some

very nice a core inductors and some fite

cord I thinks I think inductors and we

have some

capacitors and uh there also there's

also one thing maybe worth mentioning um

the brand of the XLR connector I don't

know if you can spot that you can see

that this is uh made by Aran Aran is

supposed to be uh doter brand of notri

Cheaper brand than notri but they are

still producing uh quality connectors uh

I know about them because uh I'm usually

using uh

um either n rink or ran or anel

connectors in my do it yourself uh

interconnects uh for my systems or headphone

headphone

cables uh so again internal very neat

and very clean build uh what the

producer is uh mentioning on their page

uh is that uh the speaker cables

inside uh are supposed to be produced by

um UK based company pisan and they are solid

solid

core uh they are very thick and uh very

nice speaker

cables okay anything I forgot to mention

from my notes uh yeah uh one thing to uh

mention here is that as you can see

these do not have any kind of subwoofer

output uh these are full range uh

speaker tabs uh so uh if you're going to

be using uh subwoofer you need to uh use

your Source like digital to analog

converter to provide signal and with

volume regulation uh to your subwoofer

or maybe your preamplifier whatever but

you won't be able to connect subwoofer

these uh okay I've told you about the uh

temperature I've measured uh one thing

uh more that I've measured during my

tests uh I'm not using a very precise

parameter I'm using a smart plug uh

compatible with tuya uh which is

basically good enough for my needs and

uh this stya monitoring smart plug told

me that uh the full setup both

monoblocks and the power amplifier when

I was doing my listening test tests were

using something like uh a little bit

more than 14 watts of power which is

absolutely ridiculous and minuscule

amount of uh Power so very very

eco-friendly uh construction using uh

very small amounts of energy which was

very surprising to me because uh during

my test I've connected uh and I've

tested these monol blocks uh with my

electrostat speakers

and these are difficult load but still

the power

consumption uh went from 14.0 to 14.7 I

think uh and that was it uh so some some

amazing uh results here uh okay now

about my test setup uh it's the usual

test setup uh for uh all of the

amplifiers and preamplifiers and digital

T converters that I'm using so basically

uh no free tickets uh it has to play by

the same rules as the big boys uh so

htpc uh completely passive htpc running

Fubar uh 2K uh the latest version of

Fubar uh the source wereare files DSD

and lless files on my collection uh the

htpc is feeding uh sinks su6 uh digital

to digital converter and uh outputs from

DDC uh are connected via I SS cables to

my gastard x26 Pro and my Asahi Cas

4499 ex based semi da50 uh digital to

analog converter so two digital to

analog converters were used for the

testing purposes why because Gart is

based on saber and Sami is based on uh

top of the

Sak uh so uh then uh the outputs both

digital toal converters provide uh fully

balanced outputs so I was using my audio

Quest Dragon fake dragon uh XLR

interconnects uh to connect the

amplifiers uh the power supply was

connected with also fake uh audio Quest

Dragon uh Power and the speaker cables

that that I was using during my tests

were again all fakes uh redon uh nust

red D fakes speaker cables and two fake

models of audio quests uh k2s and again

dragons uh funny fact is that though

these cables are

fake almost each one of them is more

expensive than the whole set of uh these uh

monoblocks and they are also very very good

good

uh yeah the speaker cables already had

the review and the power cables will

have review uh sometimes soon um okay so

that's about the test setups the

speakers the speakers themselves uh I've

used my collection of Martin Logan

speakers uh precisely uh my Martin Logan

15s uh Martin sorry Martin Logan motion

15s Martin Logan motion 35 FDI and my

start Martin Lan and one speakers I've

also used my uh di icons mark one and my

D Opticon mark one uh for testing

purposes I was too lazy to bring up here

my worldd uh Diamond uh 12.3 uh Tower

speakers okay so that's about the test

setup I've told you the source were DSD

and lless files uh so let's now move to

the sound qualities of this nice

construction uh by the way I really dig

the look of these These are simple and

they have nice industrial look on them

uh the miniature for this video uh will

present all of them in powered on state

with this nice blue LS uh light up so

okay the sound qualities the base the

base is very accurate it's fast and precise

precise

uh it reminds me very much of the

planner base uh I mean it uh it prefers

the quality over quantity uh so I would

use subwoofer with the this set of uh

Power amplifiers but the bass is very

well controlled it's um it's conveying a

lot of good textures uh and it's very

easy to follow bus lines it's a really

nice thing to be able to precisely

follow bus guitar lines

uh you may miss some rumble though if

you're not using uh subwoofer uh the MS

the MS have very nice Clarity and

transparency they are very engaging and

musical they do not sound th that's the

first thing that I've noticed that uh

you basically every almost everyone

sorry almost every other TPA uh or

basically d-class amplifier that I've

tested so far uh usually had this th

sound quality to it uh they were all

precise they were better or worse but uh

you can almost immediately tell that

this a d class amplifier uh The Only

Exception is IMA a70 that I tested last

time uh which is uh I think three times

more than three times cheaper because

this one you can get for as I said for1

so you could have free IM a70 for that

uh okay but getting back to the

uh they are natural they do not sound th

they are full bodies full bodied uh and

they have very good

detail um some I know you'll be asking

about that you surely be asking about

the comparation to clones yes some

clones had better Meats Class A clones

had better Ms like musical Fidelity A1

clone had better me but these were just

exceptional and the MS here are very

very very good uh okay moving to the

treble a very good extension the treble

is very delicate and very melodic uh it

doesn't sound metallic and it doesn't

has this artificial shine that you can

sometimes hear in other d-class

amplifiers uh so uh all in all I I

wasn't able to tell by the sound of the

Ms and treble that this is actually a

declass amp um okay what else about the

treble uh very nice strings because of

all the detail very nice brass

instruments again because of all of the

detail available here um the treble was

very relaxing very Musical and very

clear for example uh I don't know if

you're familiar if you're not try to be

familiar uh with great set of recordings

by London fi harmonic Orchestra uh

that's a set of recordings were guys

from philarmonic Ora recorded at the

music teams from uh modern games so uh

try to look and listen for the beginning

of Call of Duty 2 Team uh you can

clearly hear all of the nice details in

the orchestra when they are starting to

play when uh instrument by instrument is

joining the music so that was something

amazing for me uh and forget completely

forget about the ciance no races of

Cilan nether in Ms neither inter here uh

so again no metallic shine no C Lance

very very good uh moving from treble to

detail uh I've already mentioned that

treble meets and base had great detail

but now focusing on the uh detail itself

um very large amount ount of background

Sounds here uh especially in live

recordings uh if you have something that

was uh recorded live some kind of uh

venue some kind of concert you'll be

able to hear all the detail of the

audience clapping uh screaming uh

talking uh which is a very nice thing

because when you're listening to that

kind of live recording it builds this

feeling of being there uh some of the

amplifiers uh also most not all but most

of the Clones that I have reviewed so

far in that kind of situation would be

focusing on the front stage I mean you

would be able to hear the things

happening around the the stage around

the scene uh but they wouldn't uh be

provided with such Clarity like here uh

so in this regard it's actually better

than some of the Clones uh so very good

good and nice feeling with live

recordings uh for example here don't go

uh everyone knows the song everyone

beats this song to death by testing uh

equipment with it but just uh listen to

the beginning listen to the audience

screaming and shouting in the background

you'll be able to clearly hear what they

are saying and what they are shouting so

very nice background detail

and uh this song Keep It on go uh also

uh moves us to the scene Imaging

um Jesus uh part of the uh review uh

because uh in this song you'll be able

to clearly hear not only what they are

shouting but you'll also be able to

pinpoint the location of the people

screaming and shouting uh to the stage

some of them are in the front some of

them are in the back you'll be able to

hear if they are closer to you on or

further away from you and you'll be able

to position them on left uh and right

sides um very good separation from the

speakers I know it's uh very often used

in reg but these amplifiers are able to

move the sound away from the speaker and

create the scene in front of the

speakers and behind the speakers so

you're not able to hear the speakers if

you close your eyes you won't be able

unless you remember where they are

standing you won't be able to point your

fingers to the speakers it's not to

speakers playing it's just a whole

complete scene u in front of you so very

clear planes very clear PLS of Music

layer it from Front to the back uh you

can easily hear the depth

information the height not so

much but uh that's also because I don't

have many uh recordings that uh have uh

very big differences in height however for

for example

example

uh what was this called

uh uh just a

second there's a recording of Pink Floyd

concert I think it was uh taken live in

G City and uh it was uh very well

recorded and mastered and you'll be able

to clearly hear uh that the guars the

leading gar and the second guitar are

not only placed one behind another and

one is to the left the other one's to

the right but also the front one is

higher than the back one you can clearly

hear that and that's also another great

example of uh good life

recording okay

so we've covered almost all uh parts of

the sound description uh Just One Thing

Remains the timber the sound is very

full bodied uh it's striking the right

balance between being th and too fat uh

it doesn't sound th at all it doesn't

sound uh like theclass at all but it's

also not fat uh it doesn't CL sound like

uh some of the

analog amplifiers because theclass are

basically gel amplifiers uh it doesn't

sound uh analog in a bad way when every

instrument is big and fat and when

you're listening to basically anything

you're feeling like like you would be

listening to your music uh in a crowded

elevator uh with that ventilation so

basically all of the parts of your truck

are there but they are crowded no

nothing like that here

very good balance very right balance

between thin and fat just right uh again

doesn't sound uh like d-class at all

all

um okay uh what else about the timber uh

quite natural I love the guitars uh

though uh some of the acoustic guitars

could sound a little bit more organic uh

but that that's just me picking up on on

some things because I've heard um very

good class A clones uh okay now

now

uh some te tech

technical uh okay so these have uh as

you've seen replaceable operational amplifiers

amplifiers

integrated I integrated operational

amplifiers my best recommendation for

this the best paying would be Opa 828 uh

that you can see here or op7

e627 uh that I've also tried Opa 627 uh

will lose some details very small amount

details compared to Opa

828 uh but we'll have a slightly better

B uh but uh as usual the recommendation

uh for opms for operational amplifiers

for d-class amplifiers uh goes to the

discrete Class A operational

amplifiers and what do we have here so

sets these ones are statos statos will

have their own review very soon they are

very great very analog sounding they are

pure Class A and they fit inside like a

glove uh you have pin one marking here

and yeah sorry Jacob I just noticed the

Mark here

so and that's it you said uh how do they

sound very analog uh they even further

move away the sound of this these monol

blocks uh from digital

domain um they give you organic uh

Timber of uh instruments though uh they

will make you lose some of the finest

detail these are not as precise as Opa

CVS integrated operational amplifiers

but that's normal that's Class E Class A

uh so highly recommend that piring

is lc5s or LC 2s uh this basically sound

the same uh however there's one

problem you won't be able to feed them

like that

because they are stopping on the

capacitors but let me share with you the

trick of the Elders of the tribe given

me by the vinor himself

12 deep sockets deep eight sockets you

can use them as extensions like that and

now you'll be able to

place LC tws and LC fivs inside just

fine uh

okay where are these legs are the legs like

that okay uh what these bring to the

table uh a little more

airiness uh than statos but uh a little

less organic Timber uh my recommendation

is to try both of them if possible

because they are bringing different

flavors uh I can't say which one is

better and which one is worse this one

is warmer more intimate more analog

sounding this one is also analog

sounding but a bit less form and with a

bit more air so the great thing is to be

able to choose from both of them and

just to compare them in specific

equipment uh

so in this case if you would be choosing

between both of them my personal

recommendation here in this particular

amplifier would go for stakato because

it gives this more uh analog more warm

feeling and it f without additional deep

sockets just like

that yep and it's

done okay

so I've told you that I tested uh these

uh amplifiers these monol blocks uh with

my selection of speakers the last set of

speakers that I was using for my test

are my electrostat speakers because

these are always the hardest to drive uh

and uh I've learned not to expect much

from different types of amplifiers when

connecting them to

electrostats uh but I was very

positively surprised what uh was the

signature sound of the combination of

these uh DPA 52 55 uh mon monoblock uh

set with my electrostat Martin Logan

asent one speakers it was like turbo

transparency boost uh the electrostats

are very precise and they Cal image the

3D imaging is out of this world uh this

combination was like turbo boosting uh

transparency 3D and uh depth

information uh what amazed me uh was

that it was able to achieve that uh

using just uh 0.7 of watts of additional

power I was

expecting that them uh to be uh more

demanding uh but these were able to

drive them properly uh and uh with very

good TR extension and detail basically

the problem with the electr side

speakers is that if the amplifier cannot

provide uh enough current and uh if they

are too difficult load the first symptom

symptom that you'll hear is that these

will like uh not this these speakers

they will lack Trel extension uh they

will be fog the sound will be muddy and

there will be no highest Trel extension

that you can hear this was not the case

with this two they were working properly

actually they were working very very

good and uh what I've noticed uh I

actually wrote that down because I you

know um I'm testing the equipment the

critical listening sessions always take

place uh in the night uh because that's

the time when I have the most clear

background sound background there is no

sound pollution coming from the streets

from from the building itself and uh

this allows me to be able to discern the

fine details of the sound uh so what

I've noted is my wife shouting from

downstairs that maybe I should think

about lowering the volume uh a little

because people are sleeping around here

uh well the idea was that uh the this

combination of this set and Martin Logan

electr set speakers uh wanted make made

me want to go louder and louder so I was

moving the volume up and up and up step

by step uh because uh it sounded better

it seems that these have a very low

total Harmony

Distortion uh when used with Martin

Logans so I've never felt that the sound

is too loud I've never found found and

I've never um heard the sound to be

fatiguing I just wanted to raise the Vol

to be able to get more of that life

feeling more of that fluid of the

details and the scene around me so

that's something uh very amazing

um spoilers uh I'll do the summary at

the end of the video but the spoilers

this set regardless of the outcome of my

clone race uh this D Set uh these two

mon blocks and this power source will

remain with

me okay some additional random notes

that I took during my tests uh the sound

is very precise it's near warm or cold

it's highly neutral and transparent the

transparency is actually amazing I wrote

that again with underscore makes you

want to go louder and louder uh okay so

that's the I that's something I thought

uh yes it doesn't sound like typical DCL

class at all uh there's one idea that I

have in my mind uh you know my local

friends have no idea that I'm recording

videos on YouTube so uh the idea is to

use these amplifiers to make pranks on

them uh do not show them what's in side

do not show them the boxes connect them

and ask them what's this what do they

think uh what kind of amplifier makes

the sound and make them guess uh make

them guess the price that's that's the

IDE idea for

PL um okay uh another thing uh as for

the sound I have no idea uh what other

amplifier I could

compare to the sound of these these do

not sound like d class at all but they

do not sound like Class A at all they do

not sound like CL class AB at all the

closest thing that comes to my mind is

actually dzil clone because dzil clone

in a way is very brutal it's very raw

and it's very wild and it's also very

precise and this this is something maybe

not close but something that Mak makes

you think about that Zeal the similar in

a way maybe similar sound signature

maybe similar feeling that you're

getting when you're listening to your

music uh I think I could compare this to

a very honest magnifying glass uh if the

recording is uh well made uh you'll be

uh very happy uh you'll be you'll be

blown away by the quality of the sound

if the recording is badly made made

you'll be able to hear all the

deficiency for the deficiencies of the

sound it doesn't color the sound it

doesn't mask anything it doesn't have

any sweet uh coloration it doesn't have

any uh sweet and romantic uh taste to the

the

music uh for example uh another great

recording another great Coral recording

uh dragon born from Skyrim soundtrack uh

the track called burn uh is a piece of

it's a it's a it's a track uh with a

very low and very wild recording of cor

it uh with this with this set when I was

listening to this track it actually made

the hair on my neck race so that was

amazing and that was very very emotional

and the track the track itself made you

want to join them and scream with them

the same text that they are

singing uh so that's very high price uh

so I've never heard uh d-class and I

never heard 50 to 55 sound like that uh

I IMA

a70 may be getting close to that uh

because it also doesn't sound like DCL

class so it doesn't sound like TPA 5255

but it's more warm and it's more relaxed

this is just a low wildness in free black

black

boxes okay the summary absolutely great

and stunning amplifier

$400 and this will be yours uh as I said

regardless of the Clone race these will

stay with me they have some modding

potential uh I want to replace the

capacitors here I will be replacing uh

the operational amplifiers here

uh what

else maybe I'll get the second power

supply because since these are

completely separate you can use two

power supplies you don't have to use one

power supply and if you luse two of them

you'll have completely separated mono

setup uh but uh there's no har with that

because uh the SPs say that this is good

up to 800 watts maybe I don't know but

throughout throughout my testing uh

these were using uh 14 let's say 15

generously say 15 wats of power so

there's very very uh big uh difference

between uh possibilities of this power

source power supply and the power

requirements of these two uh okay again

because I need to tell you this again it

doesn't sound like theclass at all not

at all uh highly

recommended uh I'll post the link uh to

the shop I got this from uh in the video

description uh if I forgot anything just

ask me in the comments and as usually if

you found that video helpful uh

interesting if it helped you uh to make

a decision or buying or not buying the

equipment you're more than welcome to

buy me a beer I a beer fan uh I love

selection of local beers and I love

different viewers from all over the

world maybe I'll do a video on that

someday ah we see about that anyway

thanks for watching again that was a

very long video 43 minutes and running

thank you if you have any questions if I

forgot about anything please do not

hesitate ask me in the comments see you

next time guys with the review of

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https://www.youtube.com/watch?v=UF8uR6Z6KLc

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