Well, damn... an $80 amp that slays | Fosi Audio TB10D review
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- Опубліковано 31 січ 2025
- We’re checking out the new and improved Fosi Audio TB10D 2-channel, Class D amp. This is an upgrade to the previous model, which by many accounts was not great. What is a Class D amp? I explain that in the video as well.
Purchase link: www.fosiaudio....
Promo code: TB10DP15YTB (for $15 off)
NOTE: I don't get any sort of kickback or monetary gain from sales of the amp.
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Fosi is certainly and up and coming company with lots of affordable amps (including models with subwoofer outputs) and the company has even revised and improved previous models based on former reviews, so it's great when a company takes reviews/criticisms seriously to upgrade its products as well as the overall customer experience.
I'm still amazing at how much power can be packed into a small box nowadays...
@@Channel33RPM Yeah, those small amps really pack a punch and are an excellent value, especially for anyone starting out on their musical or record collecting journey or for the home office, garage, home theatre, etc. as you stated in your video. :)
I bought the Fosi Audio Phono amp to compare it to the one with my entry level AT player and I was blown away. I’ll upgrade one day but it does the job for now. Keep on spinnin’.
Great video, Frank!
I love seeing your reviews on gear as well as music. Not everyone can afford expensive pieces of equipment. Im sure lots of students with limited experience, funds and space might scoop this up.
Keep on spinning, Frank!!👍
Love these information videos. Always learn something new. Appreciate you sharing knowledge Frank.
Umm... Class D is not analog. It's a PWM (pulse width modulation) amp. Neither digital nor analog. I have a Fosi amp that I use with my gaming/video editing/audio editing rig. Class D can sound harsh, but if it does its because it's not being done correctly. Class D can sound really good, if done correctly.
Hi Frank, I bought one of these last year to go with my Pre Amped Turntable and a pair of Q Accoustic Bookshelf speakers and it sounds great as a second player in my lounge area.
Could be a good alternative for some. Thanks for sharing Frank!🎧
I bought a fosi BT30Dpro. it has bluetooth. very happy with it. honestly, i wouldnt buy one of these without bluetooth, its just too convenient. thanks for the review.
Just so everyone knows, this amp has been measured as 50wpc@8ohms, and 85wpc@4ohms just before clipping, with included 32v5A power adapter. Since Class D amps tend to lack fullness, the tone controls might help with the balance. I'd be curious to know if this amp sounds any different than my Aiyima A07 that has the same chip, and is surprisingly good with my KEF Q350 speakers. Not perfect, but good.
A07 is hard to beat for the price, but just lacks tone controls.
Out of the box, both amps sound about the same if you have the tone controls centered properly. It's the same chip, so you probably wouldn't get much of a difference.
I would say even less. It is not in pair with my Rotel which is rated 40W@8Ohm. This start to clipping earlier, not saying less dynamic and much harsher. It is OK for nearfield, but not for room listening.
I tried that one last Fall and I returned it. Not because it was bad. It was pretty decent but I currently use an older model from Fosi for my computer and for that purpose, there was no noticeable improvements (a little better sound but it was marginal at best). Also, for my purpose I didn't need the bump in power this provides so all in all, I thought it was not worth the upgrade for me.
That said, if you need to crank the sound in a big room with big speaker, this would certainly a good starting point for cheap.
Their phono preamp is quite good and a a great deal.
Just hooked up a new Rockville Amp/Speaker combo that cost $150 and it sounds great!
Definitely something nice and small if its something you need to stash away. It totally makes sense as anywhere ya wanna put a stereo. I was thinking itd be perfect for a small room.
I have this amp and a NAD C388. This thing is amazingly great!!
I am amazed at how much can be packed into a little box nowadays.
There maybe other comments saying the same . In tests the Purify audio Amps , Class D , are way better with less distortion with ample power than so called Audiophile amps. Class D done right sounds excellent and measures so too.
Awesome video bro
I prefer the sound of TB10D compared to ZA3 monoblocks...it can easily drive my vintage 6ft tall Genesis APM-1 speakers (89dB sensitivity) .....sounds extremely detailed, neutral and very transparent...amazing bass. Connected directly to my CD player. I'm using the 48v 5a power supply from the ZA3....it can get very loud at 9 o'clock volume so most of the time I'm only set between 7 and 8 o'clock. Very detailed even at the lowest volume level.
That was dinky little amp Frank. Thanks for the review and a great little amp for a budget system. Keep on spinnin !!
Bit off topic, Frank. I also have Fluance Reference tower speakers and while looking for an amp to complement them I contacted Fluance for suggestions, there were none, but when I asked if Emotiva BasX A2m Stereo Flex Amplifier rated at 50W into 8Ohms would work Fluance agent told me that: " If you check the specification section of the XL8FW Speakers you will see that these speakers have a power handling of 80 - 160 Watts RMS, given this amp has a power output of 50W it would not be compatible with them."
Then I watch this video where you say that you are using Marantz PM6004 and according to its specs it puts out 45Watts into 8 Ohms and like you say it sounds great.
Please help me understand what I am missing here as I am lost trying to find an amp that will have appropriate power for Fluance Reference yet not cost arm and a leg.
Sorry for the late reply, but I just stumbled across this review.
Speakers generally have 2 power ratings, like Fluance quoted to you.
The lower rating is the "minimum recommended power" which is to avoid clipping that could damage the tweeters at high sound levels.
The higher rating is the "maximum recommended power" which is generally to avoid overheating or damaging the woofer's voice coils.
Can you run an 80-100 watt speaker off of (say) a 10 watt amplifier? Of course you can but you need to be careful not to get into excessive clipping. (i.e. don't turn it up to the point of distortion.)
Can you run an 80-100 watt speaker off of (say) a 250 watt amplifier? Of course you can but you need to keep the power in check to avoid overheating the woofers.
I have a tb-10d hooked up to a pair of Pioneer towers and it works a treat.
An assessory that might go well with the Fosi is a Bellari PP532 Passive Audiophile Preamp if you want to stay small but plug in more (up to 4) source inputs. It's another $110 so unfortunately it's starting to get close to the cost of a low power class A/B integrated or receiver. Bellari makes some interesting stuff and it's made in the USA (if that's a consideration).
Interesting... I will check that out
I like my Fosi got one years ago a 50w and then the 100w came out which I am using to this day to power my Dayton Audio B652-AIR's on my PC setup killer sound for under $150
I conducted a comparison between the Onkyo RZ50 in pure output mode (RCA) and the BT30D Pro (RCA), both using RP5000F towers and an amp selector switch. I was unable to hear any difference between them, which is good news. It appears that the well-implemented TPA3255 chip sounds the same in all cases.
There's no reason it should sound different when "well-implemented" ... the big trick with these Class D designs is getting the output filters right.
Great review! My 10d's volume nob has a little slack going from left to right. Did your review sample have slack or was it tight? Thank you.
Something I'd put in my Car . Bout size of those old FM converters
It won't run on 12 volts. Minimum is 18.
Frank..you mean "D" as in DIGITAL. It's not analog at all. But to your point, they can still sound good ... If it's done right.
Edit . great video. We also miss Mrs Channel 33.
PS... for streaming, I bought a Grace Digital Gracelink. It has an app I can control it with, but it has a nice color lcd display too so you can control it from the front panel. Its cheaper than that Arylic, but doesn't have an amp...but I didn't want one anyway. It can also play music from my NAS.
@Douglas Blake There is nothing analog about PWM. It's literally time slices of on and off. Ok, it's an analog signal, but it is not being handled in an analog way. At all.
"
Class D amps, also known as “digital” amplifiers, work by shifting the sample frequency at which they operate up to extremely high frequencies. In doing so, they use MUCH smaller power transformers which takes up far less interior space"
As is the case with that tiny amp he holds in the palm of his hand. It has about the same digital IC found in all of them.
Ok, the D might not stand for digital in this case, but that in no way makes that an analog amp. It IS high frequency switched.
Apparently they are soon to release a new version. I returned my BT30D because it was not compatible with 48 volt 10 amp power supply needed to take advantage of the TI 3255 chip and to get max performance, not achieved with the 32v power supply.
There are actually two amps from Fosi designated BT30D ...
The original BT30D which uses the TPA3116 chip that maxes out at 24 volts.
And the new BT30D *Pro* which is TPA3255 based and can work at 48 volts.
But... you should also ask yourself what the advantage of the 48 volt supply would be... The TPA3255 is a fixed gain chip, so if you're playing music at (say) 65 db and you swap in the 48 volt supply, it's very unlikely you would hear any difference at all. What the bigger supply gives you is a bit more headroom (3db worth) but no significant change in volume or sound quality.
@@Douglas_Blake_579 Interestingly, the only place i could find the 48 volt power supply was on Fosi's website and it cost almost as much as the amplifier. I got it because i wanted to test the difference but cant bring myself to spend up so much for the 48 volt power supply when the stock is more than adequate for my needs.
@Douglas_Blake_579 recent addition the 48V 5amp power supply for this is now on sale on Amazon for 20.00 less than on Fosi's own website. So I grabbed one up - just to see for myself. And i dont know what you are basing your opinions on, you certainly haven't done an actual test from personal use of the gear mentioned, i noticed a vast difference as if my speakers woke up and stretched. I'd recommend the upgraded power supply even if you poo poo it without trying it.
@@vinylmonster4907
Oh wow ... a lot of assumptions for such a short comment.
YES ... I have both listened for and measured the differences. What you get is a bit more headroom with almost no change in sonic quality.
AND... I've had the same result across multiple implementations of the TPA3255, ranging from the a07, v3, tb10d... all the way to a number of DIY boards.
@@Douglas_Blake_579 THEN SOMETHING IS SERIOUSLY WRONG! Because your your tests are nonsense and completely contradictory to my actual real world experience....but then again I'm not testing, I'm using and enjoying, not looking for faults, trying to inflate my ego by proving my rightness.....
I just got the Fosi Audio BT30D amp to power my speakers and sub. This doesn't have a DAC but I do have the FIIO Q3 headphone amp/DAC. I was going to use my TV Sony 48A9S aux out to Q3 to the BT30D. Is there anything wrong doing this? To power my speaker components and passive subwoofer?
The video asked for my appraisal of the amplifier ...
Half an hour writing up a full assessment as well as point out solutions to a couple of problems....
And my comment disappears!
Bottom line... it's good, but it has issues.
Man, that sucks. I tried looking for your comment in the 'held for review' folder (sometimes UA-cam asks me to approve longer comments), but it's not there either.
@@Channel33RPM
Short version ...
I put it on my test bench and went over it with a fine tooth comb. I discovered design errors in the standby circuit that could leave the amp on, even when turned off and I found an issue with the output coils being too close to the chip's heat sink that was causing both degraded sound and excessive heating. (coils and big lumps of metal don't get along well)
These are not things you would expect a subjective reviewer to discover, since they lay in the design itself. But they are problems, none the less.
I've informed Fosi and even submitted detail about fixing them. I did the mods on my own TB10D and they're working out very nicely ... it runs cool and the sound quality is much improved.
@@Channel33RPM
I have no explanation ... I did what I always do... post the comment then re-read it. It vanished when I went to edit out a typo. Very strange.
Good info. Thank you. Are you still using it?
@@Channel33RPM
Yep. I'll continue using it for a while just to be sure my mods "stick" and actually solve the problems. If they do, I will then do the same modifications to each TB10D I bring in for friends and clients. (Unless Fosi fixes them, of course)
So far, so good.
If you want to know what a TB10D can really do ... cut it loose on a pair of "workhorse" speakers like the Heresy or L-100 ... Get ready for a big surprise!
Where did you get that shirt from Frank?
That awesome t-shirt is part of Frank's own merchandise, so if you want the shirt, provided it is still available, check out his merch store. There is a link in his description above. :)
@@TorontoJon yup, that's what I thought, but sadly it's no longer available. 😥
I had to double check to see which one it was... Yeah, that one is gone for now, but may come back at some point (I like to rotate the designs, and retire old ones as I get new ones).
Thanks Jon.
@@Channel33RPM looking forward to it's return.
I have harman/kardon Omni adapt+amp.
when a review of my Fosi Box X3, huh?
If you have a Fosi Box X3 already, why would you need a review or for that matter, what's stopping you from creating your own review since you own it? :)
@@TorontoJon uh oh, I really can, and maybe will, may be... I just wonder why no one here on youtube did it already
@@vadiquemyself Yeah, that does seem strange that nobody on UA-cam did a review already.
Looks interesting. Perhaps down the road.
i have a copy of the alice cooper comicbook
Still not better than my 1995 RCA SA-155 :)
This is true. That Optimus/Realistic/RCA is not so powerful, but paired with proper speakers it sounds great. And it's real analog...unlike this thing
With one input, it's basically a computer amp.
300watts 😂 of what gold dust unicorn power? the THD is horrendous for 2023... regardless if it's smoothed out hiss with digital signal chain. It's ok for a low budget teenage girl set up or like a background system at an office.
Texas Instruments designed the chip that this amp uses and their datasheet rates it at 2 x 315 W @ 4ohms. I would not doubt TI's engineering! Granted THD is significantly higher at high output power but I have no doubt it would be able to manage that much power.
@@mjstecyk I get it.. it's still exactly what I stated. Once things start distorting due to loads not able to rectify ... you will see what I'm talking about with this small box. There's other problems but you might want to research Class D and its overall problems - and the difference between 'chips' and transformers when handling audio. 2 different worlds.
@@SPINNINGMYWHEELS777 I stand by class d amps for handling bookshelf speakers for lower volumes - the bang for your buck is incredible with excellent reliability overall. Not every setup has to be audiophile quality.
@@mjstecyk it's exactly what I was saying this was good for. compact speakers in a small room . I wasn't even bashing it but some of the rhetoric about the product gives a different impression.
Do a search for the chip's data sheets ... "TPA3255 Data Sheet" ... the front page contains a graph that shows what you can expect in real-world use.
Bought a Fosi Audio phono preamp that lasted two days and went back to Amazon. Can't recommend there products.
Ah that sucks... I bought a Fosi preamp awhile back and it is still rocking.
Too bad it doesn’t have Bluetooth and can hook up a powered amp sub to it
Bluetooth would be cool