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TPA3255 Reference Design Class D Amp with PFFB
TPA3255 Reference Design Class D Amp with PFFB
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Old 15th May 2021, 08:46 PM   #1
xrk971 is offline xrk971  United States
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TPA3255 Reference Design Class D Amp with PFFB
Default TPA3255 Reference Design Class D Amp with PFFB

Click the image to open in full size.

I wanted this to be one of the first products I highlight in my new forum. This amp started as a GB in this thread.

TPA3255 Reference Design Class D Amp GB

There was a second GB here:

XRK RTR TPA3255 Reference class D Amp GB2

What can I say, this is a superb sounding amp. Quiet, powerful, dynamic, non fatiguing, low distortion.

JPS64 created a masterpiece with his signature symmetry, via stitched ground planes, and ultra short high current traces. The board is 2mm thick, 2oz copper, ENIG finish. Assembled in California using premium genuine Mouser-sourced BOM. Each amp is individually tested on an Audio Precision test stand at the factory and then sound quality tested by myself before shipping.

Many people have assembled this amp into a nice chassis and everyone loves the sound. With the right PSU, the amp has the distinction of being the quietest amp I have built. You cannot tell it is on with ear pressed to the speaker cone. Just silence.

I hope folks will share their builds here. Or feel free to ask technical questions.

Redjr made on of the nicest implementations. More here.

TPA3255 Reference Design Class D Amp with PFFB-4814ecd3-5b8a-4933-ba8d-666fae3fe91b-jpeg

Vunce made an awesome build with a linear PSU with an LT4320 Ideal bridge rectifier amp on a plank here:
Click the image to open in full size.

For best results, this amp should be paired with the BTSB balanced buffer which provides selectable gains (0dB/6dB/14dB/20dB) SE or Bal input and SE and Bal output. Since the TPA3255 with PFFB only has 15dB gain, it needs a preamp with about 14dB of gain in order to play music to its maximum levels. The BTSB is a superb preamp design by Jhofland. It started as a GB in this thread. Here is the panel mount version of the BTSB:
Click the image to open in full size.

Those of you who know me, know that I hate casework (chassis building). This most of my amps are “plank” amps. Amps on a plank of wood. Only the most special and deserving of amps get a chassis. Well this amp is one of those amps. More to come...
Attached Images
File Type: jpeg 4814ECD3-5B8A-4933-BA8D-666FAE3FE91B.jpeg (455.5 KB, 319 views)
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Last edited by xrk971; 15th May 2021 at 09:08 PM.
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Old 24th June 2021, 06:43 PM   #2
xrk971 is offline xrk971  United States
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TPA3255 Reference Design Class D Amp with PFFB
Hi Folks,
Just wanted to let everyone know about an exciting collaboration between XRKAudio and Living Sounds Audio. LSA will be producing a commercial amplifier with the RTR TPA3255 as the OEM core along with the BTSB Panel Mount input buffer. All of this will be in a nicely made custom CNC’d aluminum chassis. All genuine Mouser BOM and premium components like Viborg binding posts.

Here are some renders and an initial prototype of the production line unit.

TPA3255 Reference Design Class D Amp with PFFB-9007322e-735b-4018-aee6-d85adf6d66ed-jpeg

TPA3255 Reference Design Class D Amp with PFFB-226c700d-33d4-4246-a693-b140311c9a89-jpeg

We still need to tidy up the internal wiring - but it’s getting there:
TPA3255 Reference Design Class D Amp with PFFB-bc17a26f-f22b-44fb-a2b8-3cf42d00d837-jpeg
Attached Images
File Type: jpeg 9007322E-735B-4018-AEE6-D85ADF6D66ED.jpeg (100.5 KB, 257 views)
File Type: jpeg 226C700D-33D4-4246-A693-B140311C9A89.jpeg (87.2 KB, 260 views)
File Type: jpeg BC17A26F-F22B-44FB-A2B8-3CF42D00D837.jpeg (554.0 KB, 218 views)
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Old 24th June 2021, 06:59 PM   #3
Octavia is offline Octavia  United States
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looks very very nice
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Old 25th June 2021, 04:01 PM   #4
Cardone is offline Cardone
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Very nice device and neatly made
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Old 25th June 2021, 07:09 PM   #5
xrk971 is offline xrk971  United States
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TPA3255 Reference Design Class D Amp with PFFB
Hey thanks, guys. Some more progress photos. You can see this is not vapor ware anymore. These are not the correct binding posts. I spec’d premium solid copper with anodized aluminum knobs like in the renders. But wiring is a bit neater and buttons, switches and LEDs are connected.

TPA3255 Reference Design Class D Amp with PFFB-6a6cf40a-015a-43ce-8484-382d74cf9b59-jpeg

TPA3255 Reference Design Class D Amp with PFFB-2b322687-445a-4656-a30e-0fba564141b5-jpeg

TPA3255 Reference Design Class D Amp with PFFB-a12c1b17-3538-42fa-a425-b6b220b9cee4-jpeg

Some neat details like dual 18ga silicone RC race car wires for the speaker outputs for extra low impedance. Also silicone wire is used for power from SMPS to the amp.

The BTSB buffer is the best there is and provides auto switching detection of RCA or XLR with XLR being dominant.
Attached Images
File Type: jpeg 6A6CF40A-015A-43CE-8484-382D74CF9B59.jpeg (413.2 KB, 163 views)
File Type: jpeg 2B322687-445A-4656-A30E-0FBA564141B5.jpeg (577.0 KB, 184 views)
File Type: jpeg A12C1B17-3538-42FA-A425-B6B220B9CEE4.jpeg (373.1 KB, 163 views)
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Last edited by xrk971; 25th June 2021 at 07:14 PM.
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Old 22nd July 2021, 12:04 AM   #6
xrk971 is offline xrk971  United States
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TPA3255 Reference Design Class D Amp with PFFB
The first production unit has been delivered and it looks and sounds stunning!

TPA3255 Reference Design Class D Amp with PFFB-2d3010a3-08b5-4fe6-84e7-4049cdc12f82-jpeg

TPA3255 Reference Design Class D Amp with PFFB-4304227b-ee4f-4412-a53c-825cdaba07de-jpeg

TPA3255 Reference Design Class D Amp with PFFB-f055bfbf-c2c0-4c5c-96ea-86c5d2bff54f-jpeg

Some sound clips of the First Sound test playing on my Rockville speakers.

First Sound of new Warp-1 Amp! - YouTube

Watermelon Man - Warp-1 amp test - YouTube
Attached Images
File Type: jpeg 2D3010A3-08B5-4FE6-84E7-4049CDC12F82.jpeg (251.6 KB, 88 views)
File Type: jpeg 4304227B-EE4F-4412-A53C-825CDABA07DE.jpeg (258.5 KB, 100 views)
File Type: jpeg F055BFBF-C2C0-4C5C-96EA-86C5D2BFF54F.jpeg (363.8 KB, 109 views)
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Old 22nd July 2021, 06:24 AM   #7
Cardone is offline Cardone
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The case has become very good and neatly constructed ...
Good work....
Thanks for the pictures....
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Old 22nd July 2021, 03:47 PM   #8
xrk971 is offline xrk971  United States
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TPA3255 Reference Design Class D Amp with PFFB
Thank you. The case is really nicely made. 6mm thick top and bottom panels feel substantial and side panels are 4.75mm thick. The satin finish powder coated paint is really beautiful to see and touch. It’s a nice weighty feeling amp when you pick it up.
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