ICE input sensitivity

Skorpio · 18th March 2009, 09:29 AM

I have to much gain in my system, so my preamps volume control is only used i the area from 8 to 9 o'clock. In the manual (Parasound) it is stated that best performance are percived if the volume are around 12 o'clock in normal listening mode.

I would also like better "resolution" when using remote, so the volume is less sensitive...

I was considering lowering the gain in the preamp, but then an alternative came up:

My poweramp is an ICEpower DIY based on ICEpower 200ASC modules. The input seems to be an opamp in virtuel ground mode. Input resistance is 10kOhm in unbalanced mode.

If I put a resistor in series with the input (direct on input jack) I would increase input resistance and lower sensivity? If i ex. uses i 10k in series would I not lower gain by 6db?

Is there any problems with this solution? Other than the fact that my preamp must deliver a higher voltagesving?

bwaslo · 18th March 2009, 12:19 PM

Seems like a good plan. 6dB isn't a lot though, you might want to add 30k to drop 12dB instead.

Skorpio · 18th March 2009, 01:19 PM

Ok, I will try that....thank you for the response

Skorpio · 18th March 2009, 05:16 PM

Just tried with both 10k and 22k and sensitivity was reduced as planned....but.....so was the sound quality!

Bas was reduced downwards, now sounding funny and image and dynamics was gone for good...

Back to normal, everything was nice again (exept level

).....

Don't waste your energy on this little trix

18th March 2009, 09:29 AM	#1
Skorpio diyAudio Member Join Date: Mar 2004 Location: Denmark	ICE input sensitivity I have to much gain in my system, so my preamps volume control is only used i the area from 8 to 9 o'clock. In the manual (Parasound) it is stated that best performance are percived if the volume are around 12 o'clock in normal listening mode. I would also like better "resolution" when using remote, so the volume is less sensitive... I was considering lowering the gain in the preamp, but then an alternative came up: My poweramp is an ICEpower DIY based on ICEpower 200ASC modules. The input seems to be an opamp in virtuel ground mode. Input resistance is 10kOhm in unbalanced mode. If I put a resistor in series with the input (direct on input jack) I would increase input resistance and lower sensivity? If i ex. uses i 10k in series would I not lower gain by 6db? Is there any problems with this solution? Other than the fact that my preamp must deliver a higher voltagesving?

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18th March 2009, 12:19 PM	#2
bwaslo diyAudio Member Join Date: May 2006	Seems like a good plan. 6dB isn't a lot though, you might want to add 30k to drop 12dB instead.

18th March 2009, 01:19 PM	#3
Skorpio diyAudio Member Join Date: Mar 2004 Location: Denmark	Ok, I will try that....thank you for the response

18th March 2009, 05:16 PM	#4
Skorpio diyAudio Member Join Date: Mar 2004 Location: Denmark	Just tried with both 10k and 22k and sensitivity was reduced as planned....but.....so was the sound quality! Bas was reduced downwards, now sounding funny and image and dynamics was gone for good... Back to normal, everything was nice again (exept level )..... Don't waste your energy on this little trix

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