hi!
I have a question about tuning the JBL 180.2 amplifier for a pair of CDT ef-61 components.
When the volume is low I get a little bit of distortion from myspeakers from about 1-5 on the volume. I am not sure what is causing this. I thought possibly the amplifier isn't tuned properly.
Could someone direct me on how to tune the amp to the right frequencies?
Replies (3)
swez on 05/23/2004 22:00:34
Check your gain settings on this amp. If too much gain is used,(250mV -1.0 volts range) you get noise amplified at low signal levels. Try setting the gain sensitivity dial at midpoint (2.0 - 3.0 volts) and adjust til noise is minimal or gone, at low signal voltages from HU.
Swez
Munchiesyumm on 05/23/2004 22:21:39
thanks swezz..
The amp is hooked up the the Front Channel pre - out on a Panasonic Deck. I think it's 4v.
I'll see if I can adjust the gain settings to fix the problem.
swez on 05/24/2004 09:59:58
It may say 4 volts... but at low power (10-30%) of max., the HU voltage is much lower. Maybe 1 volt or so. Once you get closer to 70% of max., output.. the HU preout voltage will climb to the 4.0 volt rating.
Just use your ears and set the amp gains (~2-3 volts) to a point where the noise is gone, but not so sensitive (1 volt or less) that too much power hits your Comps and burns them out.
Swez
I have a question about tuning the JBL 180.2 amplifier for a pair of CDT ef-61 components.
When the volume is low I get a little bit of distortion from myspeakers from about 1-5 on the volume. I am not sure what is causing this. I thought possibly the amplifier isn't tuned properly.
Could someone direct me on how to tune the amp to the right frequencies?
Replies (3)
swez on 05/23/2004 22:00:34
Check your gain settings on this amp. If too much gain is used,(250mV -1.0 volts range) you get noise amplified at low signal levels. Try setting the gain sensitivity dial at midpoint (2.0 - 3.0 volts) and adjust til noise is minimal or gone, at low signal voltages from HU.
Swez
Munchiesyumm on 05/23/2004 22:21:39
thanks swezz..
The amp is hooked up the the Front Channel pre - out on a Panasonic Deck. I think it's 4v.
I'll see if I can adjust the gain settings to fix the problem.
swez on 05/24/2004 09:59:58
It may say 4 volts... but at low power (10-30%) of max., the HU voltage is much lower. Maybe 1 volt or so. Once you get closer to 70% of max., output.. the HU preout voltage will climb to the 4.0 volt rating.
Just use your ears and set the amp gains (~2-3 volts) to a point where the noise is gone, but not so sensitive (1 volt or less) that too much power hits your Comps and burns them out.
Swez
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