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Allo CM board makes a profound difference to the sound of the base Volt+.

The base Volt+ has 1 x 1000uFD to filter/supply both channels of the 3118.
In this configuration, the mid and low bass are very weak.  This is driving
very difficult 2 way bookshelf reference speakers (86db/W/m).

Trying differen SMP bricks, didn't not fix the problem.  I went up to 24V @ 5A SMP,
then went back to 19V @ 10A (which had more resolving power).   People also
seem to be leaning towards linear supplies over SMP bricks.

Then I tried a CM board (2 x 1000uFD) as a pre-filter into the Volt+.

The mid and low bass were markedly improved.   Still not as firm and control
as the amp I was comparing it against (which was 140W AB with 30000uFD
and costing 60x more $).

I'm definitely going to increase the pool up to 7K uFD with fast ESR caps
as the next stage.

Also, the wiring to the speaker output terminals on the Volt+ Step Attenuator
are very lacking.   Very thin wire (which may account for the thin mid/low bass)
and not solder (tension with a screw) which came loose (had to debug this).   

The upper end is spot on.   Imaging of solo vocals and single instruments are very

But for the price point,  I really can't complain.

VOLT + standalone AMP / Re: Volt + Standalone with Step Pot.
« Last post by errcl65 on August 23, 2017, 10:57:36 AM »
I can follow the topology change in the TI white paper to bring the
Volt+ into PBTL mode.   Is there any issues with doing:

Ground Left input, and combining speaker output as per the white paper?
VOLT + standalone AMP / Re: Volt + Standalone with Step Pot.
« Last post by sparkyadmin on August 22, 2017, 11:07:45 PM »

     Volt + board supports only BTL mode and don't have any jumper options to change the PBTL mode.

With Regards
Sparky Admin


   This device Reduces the output ripple/noise of any PSU to almost negligible levels (less than 5mV up to 1Mhz).And feeds clean power.

With Regards
Sparky Admin
VOLT + standalone AMP / Any benefits adding external CM board to the Volt+ series
« Last post by errcl65 on August 22, 2017, 10:27:56 AM »
Any benefits to adding external CM board to Volt+.   20000 ufd more
help the sound much?
VOLT + standalone AMP / Volt + Standalone with Step Pot.
« Last post by errcl65 on August 22, 2017, 08:52:17 AM »
Can the unit be configured to run in PBTL for a little more headroom in Mono mode?

TI ap notes : ground the Left Input, and use the Right output Pair as +(positive)
Speak Out and Left output Pair as -(neg) Speaker Out.

Technical Questions / Allo DigiOne 192KHz/24 Music playback problem
« Last post by drsmiley on August 22, 2017, 06:58:41 AM »
I received my DigiOne on Monday (8/21/2017) and everything sounds great except 192kHz/24 music files.  The playback is slightly choppy and I can see on my amp (Teac AI-301DA} that the source indicator is slightly blinking during playback.  On all other sample rated music files (96kHz/24 and 44.1kHz/16), the source indicator is solid during playback.  The Teac AI-301DA user manual states that the indicators blink when the input is not a digital audio signal (Page 11). I also have an HIFIBerry Digi+ Pro that I used on the same raspberry PI3 and itís able to play 192kHz/24 music files with no problems.  Iím using Volumio 2.246 as the music source with the playback buffer is set to 12MB and buffer before playback is set to 40%.  The raspberry PI is connect via ethernet to my network. Is this a driver or board problem?

PIANO HI-FI DAC / Re: Does Piano DAC use the RS232 TTL pins from RPI3 ?
« Last post by sparkyadmin on August 10, 2017, 01:54:35 AM »
PIANO HI-FI DAC / Re: Does Piano DAC use the RS232 TTL pins from RPI3 ?
« Last post by Kiranps on August 10, 2017, 01:43:05 AM »
You have shared Piano 2.1 Link.
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