Just picked up an SMSL TDA7498 based amp ... to much hiss - diyAudio
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Old 21st July 2012, 01:35 AM   #1
Tino is offline Tino  Canada
diyAudio Member
Join Date: Jan 2004
Location: Toronto
Default Just picked up an SMSL TDA7498 based amp ... to much hiss

Even with the volume level down all the way, there is too much hiss. Maybe the input sensitivity is very high and thats the result? I notice I'm getting much more output with the volume knob even at 1/4 turn vs my other amps.

Is there any easy way to make the input less sensitive? Say if an amp normally reaches full output at 1V input, to have it so that its full output at 2V instead?
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Old 16th September 2012, 01:37 PM   #2
obinse is offline obinse  Indonesia
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Join Date: Sep 2011
Location: Bandung
My 2x100w TDA7498 has just arrived 2 days ago. First listening with this setting:
2 way bookshelf speakers, foobar 2000 on my notebook, i heard that it has hiss....
Then I tried to lower the gain: toggled both the sw2 switch to "on" position.
I will try to add EMI/RFI bead suppresor filter on the power supply path, which it works well to kill noise on my DIY LM1875 amp.
Or try a better PSU. Maybe a car battery can do it best?
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