Allo Volt+D (Class D) Power Amp: My impressions and experiments

[Rohitkhanna]

@raghupb it is a TDA3118D2 chip and don't run it off 24v. The best SQ in terms of THD you will get is at 19.5.
Also the 45/50 watt ratings are the peak values at a much higher THD.
At 19.5 volt, these put out around 20 clean watts at around 0.1 % THD at 8 ohm and a little more at 4 Ohm at a little higher thd.
In BTL mode these can do 30 watt at 8 ohm, btl not advisable for 4 ohm without better heat dissipation.

Its elder brother tda3116D2 packs twice the power but 3118 sounds more musical.

I was running three 3118D2 boards and one 3116d2 mono board in a 4 way active setup in my car with superb results.

So I was playing with off the shelf TPA3118 modules. Noticed that with input unconnected, and also with around 20-25kohm across input pins (no signal), there's a distinct low volume hissing/ white noise audible from speakers. As soon as signal is applied or input is shorted, it disappears. Any tips on source of this/ remedy?

 

[John]

I am thinking of going this route. Got some spare Polk bookshelves lying around, RTi4. Also a Chromecast Audio + DAC (iFi Zen or Modi 3) Thinking of getting the Volt+attenuator+case along with a 19W power supply. Will set me back by 4K or so. Too good to be true?

 

[premoddev]

You should go with Volt+D, the dual mono version.. it's the version reviewed here..

Buy VOLT+ D (DOUBLE) online in India | Fab.to.Lab

VOLT+ D (DOUBLE) 2X60W

www.fabtolab.com

 

[John]

You should go with Volt+D, the dual mono version.. it's the version reviewed here..

Buy VOLT+ D (DOUBLE) online in India | Fab.to.Lab

VOLT+ D (DOUBLE) 2X60W

www.fabtolab.com

Thanks bud. This does sound promising. Do I need to source a 24v volt power supply.

 

[premoddev]

You can start with a 19v laptop charger..if you supposed to buy, then buy 24V ..

Btw, I haven't heard this Amp yet..

 

[John]

You can start with a 19v laptop charger..if you supposed to buy, then buy 24V ..

Btw, I haven't heard this Amp yet..

What kind of connector does the power supply port use? Any idea?

 

[premoddev]

Here is the one Allo sells for the amp..and people often says normal laptop charger will work.. not sure about the exact pin ..

Buy Power Supply - 19V online in India | Fab.to.Lab

Power Supply - 19V

www.fabtolab.com

 

[John]

I have a less used volt+d lying with me in very good condition. Will be willing to sell along with a 19v and 24v power supply.

Have send you a PM.

 

[premoddev]

@abhay.jena could you please tell us the difference when you tried with 24v power.. even the OP could not try with 24v psu..

thanks..

 

[premoddev]

In my experience the 24v power supply opens up the sound stage a bit more and is overall better sounding than with the 19v stock power supply and more so with less sensitive speakers.

Thanks for your impressions... Will it heat with more with 24v psu?

 

[John]

@abhay.jena Thanks. Received the amplifier.

I first tried with with Modi 3 and then with ifi Zen Dac.

It is no Rega, but it is quite sweet - especially with my Polk bookshelves RTI4. The Sonodynes did not sound as good; guess they need more power.

 

[jbkar]

What is the maximum power rating class D amp available from volt +D