morello

Hey guys

A few months ago I had finally had enough of the factory sound system and installed the following:
Pioneer GM-D9605 5 channel amp
JL 10TW3 shallow sub in a custom box
Morel Maximo 6 front component speakers
For-11ck Adapter to use the factory head unit
The head unit has been wired to the speaker-level input on the amp.

I can get everything to sound great, but every day the channels seem to be at different volumes. Some days, I will start the truck and the sub overpowers everything. Other days the front channel is much louder (or quieter). Occasionally, the front channel will drop what sounds like 3db in the middle of a song and stay that way for a day or two. I've checked/re-secured the power wiring to the amp, crossovers and everything else seem solidly connected. Sound never disappears completely, just the relative volume of the channels is constantly changing. What gives? The GM-D9605 isn't sold anymore, I'm wondering if I just got a turd?

martinjose

does speaker-level = high level into amp.

I had this set up and just did not sound to great.

REad around and found the ACM can be changed to low level. Did this and wow. What a difference in sound quality.


With Forscan, I changed ACM=727-01-01....xx59 F8x8 xxx and 727-01-02....00xx (search and find more info.)

Have the following setup: Infinity speakers all around driving by Rockville 5 channel and an infinity bass amp. I can't believe the differences in sound quality. Waiting on a DSP-408 to install.

morello

I just switched the ACM to "low level" - we'll see if that helps. Had to turn the gain on on the amp almost all the way up - is that normal for line level inputs? I'm not sure if my amp likes having line-level signals sent into the "speaker input" port, but if I can avoid reterminating all those wires with RCA plugs I will.

Teaberry

I may be wrong, but I think your amp should only be taking low-level inputs via RCA plugs. The "speaker inputs" aka high level are for just that - having to max out your amp gain reinforces this as well.

martinjose

You maybe better off going wiring for RCA. I used these in order to provide RCA inputs.

https://www.parts-express.com/rca-ma...2UWhoCCbzw_wcB

jdunk54nl

These are cheap and you can always cut the wires if it doesn't work

nineball

that's because you are not supposed to do that and could easily damage your amp. low level signals go into the RCA inputs only.

the gain **** is not a volume ****. it is used to match the input signal to the amp so you are not amplifying a clipped signal.

dhmcfadin

Yup.

morello

The source of the gain issue is actually that the amp isn't turning on at all, because it can't sense the line level going into the amp and i don't have an external signal hooked up. Gonna go back to speaker level until I feel like rewiring this thing.