ICE-Power-50ASX2 Volume control

[eilon]

Hello Ladies and Gentlemen,
I am considering buying a ICE-Power-50ASX2 for my fullrange desktop speakers. Right now I am using a old and big Yamaha stereo Amp, which is to big for my desk.

So I am planning to build a amp with a ICE-Power-50ASX2, because I dont have to worry about the power supply.

I know how to build the case, and I think I will figure out everything else.. But to be host I dont know how to adjust the volume
Is it possible to add a potentiometer to the amp or do I need a preamp?

What kind of potentiometer would be possible, if a pre amp is not neccessary?
I am using a standard pc as a player.

King regards,
Eilon

 

[tomchr]

According to the 50ASX2 data sheet (which you can find online), it has a standard single-ended input. That means a regular volume pot will work. I'd get a stereo 10 kΩ logarithmic/audio taper pot, for example the ALPS RK271-series.

Tom

 

[chermann]

Hi Eilon


wow this amp for the desktop...respect


with your sound card at your PC you should have a line output L/R for the amp. with your player (e.g foobar..) you can adjust the volume. so no extra pre-amp is needed.


but please look at your sound card output impedance because the ICE 50ASX has 8kR input impedance as i can read from the datasheet. maybe this is too low for your card and the sound card gets out of juice.--> preamp needed


preamp...sorry i am not so fit because i go from my pc over a DAC to the amp

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chris

 

[jonners]

The input impedance of the 50ASX2 is quite low so for best results you will probably need an input buffer: https://www.diyaudio.com/forums/class-d/190311-icepower-50asx2-modules-7.html#post4838804

 

[invaderzim]

from: ICEPower 125ASX2 Measurements and Mods


"I've added a potentiometer at the input of the amplifier, and it turns out that the input impedance of these ICEPower amps drops significantly with rising frequency. At DC, the input impedance is 270K, at low frequencies, it drops to about 27K, and at 20KHz it's below 6K. This means that the amp needs a low output impedance source to drive it The beauty of these amps as I saw it was that they were complete with only connectors and an enclosure needed. But it turns out that a simple volume potentiometer put in front of the amp messes up the frequency response significantly. "

 

[thegoldenear]

i would ditch the idea of a analogue pot and find a dac with digital 32bit volume control.
i used to use the 125asx and it was much better with a dac with digi volume control (100ohm output impedance)