Has anyone on here bought one of these TPA3255 amps and if so what do you think of it? I have just received mine and am yet to have a listen. You do not get any leads with it and all the DC plugs to connect a PS did not fit. I worked out that the reason is the centre pin of the socket appears to be fatter than normal. I sacrificed part of a wall wart and gently drilled the centre core of the plug and made it fit.
I got mine from Aliexpress for £23 which given that it has a nice case and all the connections is silly money. Having bought a lot of different Class D boards (TA2024, TA2020, TPA3116, IRS 2092 x 2) I was keen to hear a 3255. Price has nearly doubled in only a couple of weeks
https://www.aliexpress.com/item/100...der_detail.order_detail_item.4.2351f19cUxzPuU
I got mine from Aliexpress for £23 which given that it has a nice case and all the connections is silly money. Having bought a lot of different Class D boards (TA2024, TA2020, TPA3116, IRS 2092 x 2) I was keen to hear a 3255. Price has nearly doubled in only a couple of weeks
https://www.aliexpress.com/item/100...der_detail.order_detail_item.4.2351f19cUxzPuU
5.5/2.5 plug fits without problems here
I also received amp today and only connected it to six little 16 ohm FBT speakers to test function a little. Ordered a cheap 48V/3A brick with it. It is a nice small little amp, bluetooth functions well it seems, amp enclosure becomes nicely warm but not really hot sofar. With bluetooth the topend with these speakers is a little more friendly than with Wondom/Sure 3116 with Chromecast audio as source, slightly more dynamic maybe, bass I cannot say because the six little bassreflex speakers are tuned at 90Hz I believe, so very little beneath that frequency. Haven't tried DSP yet, did ask for software today, haven't received it yet, I think it will be the ACP Workbench as mentioned in other threads
I also received amp today and only connected it to six little 16 ohm FBT speakers to test function a little. Ordered a cheap 48V/3A brick with it. It is a nice small little amp, bluetooth functions well it seems, amp enclosure becomes nicely warm but not really hot sofar. With bluetooth the topend with these speakers is a little more friendly than with Wondom/Sure 3116 with Chromecast audio as source, slightly more dynamic maybe, bass I cannot say because the six little bassreflex speakers are tuned at 90Hz I believe, so very little beneath that frequency. Haven't tried DSP yet, did ask for software today, haven't received it yet, I think it will be the ACP Workbench as mentioned in other threads
I installed the amp this morning with a little frustration. I wired it according to the case markings on the rear, Rt IN and OUT on left of the rear when viewed from the front and L on the Rt.....a bit weird. There was something not right as the sound was skewed to the L and it sounded really weird. Swapped the connections L for R as you would expect when viewed from the front. Same problem. I left the INs as were and swapped the L & R OUTs and bingo!
When this is a few months old I will sort the DC socket and see if there is scope to change the IN and Out orientation. Not really SURE (did you see what I did there) why these amps would be intentionally wired like this and it may have been a production mess up.
SQ. First impressions very good fed with 24v at the moment. Seems nicely detailed with taut and tuneful bass. I tried to connect the amp to my laptop but it did nothing and didn't recognise that it was connected by USB. I was using an OTG lead as that is the only one I have with a USB C connector and will get an ordinary one and see if this works.
When this is a few months old I will sort the DC socket and see if there is scope to change the IN and Out orientation. Not really SURE (did you see what I did there) why these amps would be intentionally wired like this and it may have been a production mess up.
SQ. First impressions very good fed with 24v at the moment. Seems nicely detailed with taut and tuneful bass. I tried to connect the amp to my laptop but it did nothing and didn't recognise that it was connected by USB. I was using an OTG lead as that is the only one I have with a USB C connector and will get an ordinary one and see if this works.
Haven't received software yet, but amp is configurable/reacts when I run a ACP workbench .exe file I had, don't know if it is the correct software for this amp, but I boosted 100Hz by 10dB and switching on and off is very audible, a karaoke removing of voices function works too, the usb-c to usb I used is from a Samsung mobilephone charger, connected, some parts of the dull grey graphics turn blue, seems to function ok, just didn't read a manual yet 
Amp is really small, I think I will post a photo of this ampboard next to the TI EVM to show the size difference, when I check the pcb (chip), one of these days. I did look at the pcb, chip is on bottomside with a piece of metal screwed on, which transfers heat to the little enclosure. Inductors are like Sagami TH, flat wires soldered through pcb, more than 2 layer pcb and the aux in gets an small long piece of pcb placed on top of the main pcb, to get connection to the front, weird. PCB has also a topside optional footprint for a tpa32xx.
Amp is really small, I think I will post a photo of this ampboard next to the TI EVM to show the size difference, when I check the pcb (chip), one of these days. I did look at the pcb, chip is on bottomside with a piece of metal screwed on, which transfers heat to the little enclosure. Inductors are like Sagami TH, flat wires soldered through pcb, more than 2 layer pcb and the aux in gets an small long piece of pcb placed on top of the main pcb, to get connection to the front, weird. PCB has also a topside optional footprint for a tpa32xx.
Thanks for the internal pics. This confirms that the printing on the case is incorrect on mine and probably others, the bottom of the PCB has OUT 1 and OUT2 marked. If you flip the board over L OUT is on the left and R on the right. The details on Aliexpress are attached.
https://www.aliexpress.com/item/100...der_detail.order_detail_item.4.2351f19cpWIAsh
https://www.aliexpress.com/item/100...der_detail.order_detail_item.4.2351f19cpWIAsh
Well it is a few days since I first fired this amp up and it is sounding really good. I had been using a Meanwell 24v SMPS and swapped this for a linear regulated supply with Teddy Pardo low noise regs and this has upped the SQ quite a bit. I don't need a lot of power from the amp as my speakers are fairly sensitive. I am wondering if there would be any gain in making a 48vdc supply.
I don't know. I also swapped the red and black speaker outputs, not very important maybe. I think the plug on pcb should be turned, I tried desoldering but that didn't go easy so I decided to unscrew the terminals and swap the wires. Easiest to swap on the outside obviously But left right, phase and red white and black is often a little funny:
https://www.ti.com/lit/df/slar129a/...=https%3A%2F%2Fwww.ti.com%2Fproduct%2FTPA3255
TI EVM schematic shows left channel has the red cinch, right channel has the white cinch, TI is American I think, Chinese read backwards I believe LOL but Americans are weird too
But left right, phase and red white and black is often a little funny:https://www.ti.com/lit/df/slar129a/...=https%3A%2F%2Fwww.ti.com%2Fproduct%2FTPA3255
TI EVM schematic shows left channel has the red cinch, right channel has the white cinch, TI is American I think, Chinese read backwards I believe LOL but Americans are weird too
anyone bought the TPA3244 version of the Wondom BRU5 ? $27 on Aliexpress
Looks like it might be respectable (if not superior?) for people with high sensitivity speakers, that don't need all the power of the TPA3255
Looks like it might be respectable (if not superior?) for people with high sensitivity speakers, that don't need all the power of the TPA3255
Wondom BDM8 3255 board only > https://www.diyaudio.com/community/...mp-to-get-from-aliexpress.379676/post-7484382
