FS: ICEPower 125ASX2 module

[DQ828]

I have received my shipment safe & sound, great kit for the money, thanks Ghent

Does anyone know what pot to use with the modules 10k?

[janghell]

Two cases and one ICE module received
The two packages was not stopped in the tax import office
The cases looks very very very nice!
Can you make a version in high gloss white color?

[ghentxu]

Hi guys,

We are starting another batch of black diy-suite cases, not too many, about 15pcs. We would get them in about 2 weeks.

Please book it if anyone want it, all are black cases. (but we still have some silver cases in stock)

Our cases are with XLR input, you could easily make amp working as mono 450W if you have a pre-amp with XLR output.

Please contact me: windowsxp@vip.163.com, thanks!

Best Regards,
Ghent

[Tham]

Just ordered 1 set of 125ASX2 + diy suite from Ghent.

Looking forward to receiving it soon.

[DQ828]

So does anyone know what pot to use? 10K, 50K, 100K???

[ghentxu]

Originally Posted by DQ828

So does anyone know what pot to use? 10K, 50K, 100K???

Well, we have used 100K potentiometer before, for your reference

[MrSlim]

Putting a Pot in front of the 125ASX2 to control the volume may not be a good thing.
ICEPower 125ASX2 Measurements and Mods It needs to be driven from a low impedance source, or the high frequency response suffers.. I would re-consider trying to use this as an "integrated" amp all by itself. (If I bought one I'd be driving it with a DCB1)

[toufu]

Can anyone comment on the sound quality of asx compared to the asp series? Thanks.

[DQ828]

Originally Posted by MrSlim

Putting a Pot in front of the 125ASX2 to control the volume may not be a good thing.
ICEPower 125ASX2 Measurements and Mods It needs to be driven from a low impedance source, or the high frequency response suffers.. I would re-consider trying to use this as an "integrated" amp all by itself. (If I bought one I'd be driving it with a DCB1)

Thanks, but I'm a bit challenged when it comes to understanding input impedance. Would it be better just to leave the volume control out & drive the amp straight from the Squeezebox, or Ipod in my kids case?

Sooo much to learn & so few brain cells, what is the DCB1 used for? a type of preamp?

Can you recommend a good one to build?

[MrSlim]

Originally Posted by DQ828

Thanks, but I'm a bit challenged when it comes to understanding input impedance. Would it be better just to leave the volume control out & drive the amp straight from the Squeezebox, or Ipod in my kids case?

Anywhere in the audio device chain, (in the analog realm anyway) the output impedance of the source device needs to be lower (and much lower is better) than the input impedance of the device following it. The lower impedance of the output device is better able to "control" the input stage of the following device(follow the signal more precisely). That is often the reason that "pure" passive preamps(no electronic components) tend to "soften" the sound of a system, and now even "passive" preamps have some kind of unity (x1) gain buffer following the switching/volume control. The buffer provides a low output impedance, so that the amplifier following does not "see" the impedance of the volume control.

Oh, and yes, driving directly from the Squeezebox or Ipod is a better bet.

Sooo much to learn & so few brain cells, what is the DCB1 used for? a type of preamp?

The DCB1 is the most popular variant of the Pass B1 buffer. Since it has no gain (ie unity or a gain of 1), it isn't technically a preamplifier, since it doesn't amplify the signal, but what it does do is offer a low output impedance to the amplifier it is feeding, and thus is able to make the amp do what it is told to do with more conviction..

Since most audio sources are now line level, and don't need a preamp(unlike a turntable which does), a DCB1 with some source switching and a volume control in front of it can make a very nice "preamp", for the lack of a better word.

Can you recommend a good one to build?

The DCB1 is probably the best one to build (I have one in process myself), since it is the most popular, you will be able to get lots of support building it. You could build it on a perf board, but the easiest way is to get in on one of the Group Buys for boards.
This is the most recent group buy thread. It's probably the best place to start asking about how to get a board (that's what I did)

GB for DC coupled B1 buffer with shunt PSUs