help me out here

nutxo · Post by **nutxo** » Thu Apr 23, 2009 4:37 pm

Okay. I recently bought this thing and hooked it up to a battery and speakers to test output and make sure it worked. Yesterday I decided to install the thing and kind test run it but had somethign odd happen.

This is a 5 channel amp, 4 channels a/b and 5th is class d. Im running the front bridged as right and the rear bridged as left. Im running the sub off the sub channel, duh.

I assume the yellow input is the sub input since it says sub on it. When I run a line from my deck to the sub input I get nothing. By accident I powered it up when it was disconnected and the subs play great. I reconnect and I get no sub output.

What am I doin wrong here?

Post by **mr tibbs** » Thu Apr 23, 2009 4:45 pm

I'm sorry man, but I can't read a word on that amp. I think your gonna need to take a better picture.

Also, what amp and what model?? You may be able to find a manual on line that could help out.

nutxo · Post by **nutxo** » Thu Apr 23, 2009 4:53 pm

Its a Memphis Belle 16- MC600D . I cant find a manual anywhere. The yellow input just says sub.

Im not gonna be able to get a pic today. I have to work on it in front of my house and I dotn like people driving by to see my stuff. Theres hardly any traffic early in the day.

Post by **Jacampb2** » Thu Apr 23, 2009 5:50 pm

My guess would be there is a switch or jumper, possibly even under the cover to allow it to use the sub input, or sum the stereo inputs to give the sub channel. If such a switch or jumper exists, it is likely set to generate the summed mono...

Later,
Jason

nutxo · Post by **nutxo** » Thu Apr 23, 2009 6:02 pm

Jacampb2 wrote:My guess would be there is a switch or jumper, possibly even under the cover to allow it to use the sub input, or sum the stereo inputs to give the sub channel. If such a switch or jumper exists, it is likely set to generate the summed mono...

Later,
Jason

I was kinda thinking that. If I could get a manual it would rock but there dont seem to be any online.

Post by **ttocs** » Thu Apr 23, 2009 6:33 pm

does the sub output play at all with any of the inputs?

dBincognito · Post by **dBincognito** » Thu Apr 23, 2009 6:37 pm

Well if that is a sub input...I would assume it is mono....are you plugging it into the left RCA output ?

nutxo · Post by **nutxo** » Thu Apr 23, 2009 7:28 pm

dBincognito wrote:Well if that is a sub input...I would assume it is mono....are you plugging it into the left RCA output ?

I was using the right. I can try left tomorrow. I talked to an authorized memphis dealer and he said the switch is on the end of the amp for input selection. I assured him it wasnt there , he was puzzled. There are.only 2 switches and those are crossovers. As for internal I got some really great gut shots and dont see any switches or jumpers.

nutxo · Post by **nutxo** » Thu Apr 23, 2009 9:02 pm

I found this

!WARNING!
Channel 5 of the Memphis Belle (model# 16-MCH1300) CANNOT be used as one-half of a pair of bridged MCD1000 amplifiers.
If a summed signal for the subwoofer input of the 16-MCH1300 is not available, we suggest using the 16-BRIDGE to sum a standard left & right stereo signal. Using a simple ‘Y’ adaptor is not an option. The phase of the subwoofer may be altered by (1) reversing the speaker output connections at the amplifier; or by (2) using either the left output of the bridging module for in-phase or the right output for 180 degrees out of phase.
1. The black wire of the bridging module is connected to the chassis ground. The Red wire must be connected to a source of switched 12 Volts.
2. Provide a standard left and right stereo signal to the bridging module inputs.
3. Connecting the L output of the bridging module to the RCA input of the subwoofer section of the 16-MCH1300 amplifier will provide a signal from the source unit that is in phase with the input signal.
4. Connecting the R output of the bridging module to the RCA input for the subwoofer section of the 16-MCH1300 amplifier will provide a signal from the source unit that is 180 degrees out-of-phase with the input signal.
5. Do not use an RCA ‘Y’ adaptor between the outputs of the 16-BRIDGE and the subwoofer input of the 16-MCH1300. Doing so will cancel the audio signal completely.
6. NOT USING THE 16-BRIDGE OR SOME OTHER SUMMING METHOD WILL LIMIT THE OUTPUT POWER OF CHANNEL FIVE DUE TO INSUFFICIENT AUDIO SIGNAL LINE VOLTAGE.

Is it saying I can run a Y adapter but my speakers will be out of phase? I found another thread

You don't need the bridging module for that. Just bridge the channels like any other amp.
The bridging module for that amp is for the single rca input for the sub, which you don't need for that either.

Here is the response from Memphis about this same issue, I just used a rca Y adaptor for the sub input.

You would benefit (sound quality wise) IF your current subwoofer pre-out from the head unit isn't mono (before the y adaptor).
If you are currently inputting full range signals for front and rear, disconnect channel 5's rca input to get a
preview of how it would sound with the "correct" signal. You will still get an output on channel 5 (with no input),
presuming you have inputs to channels 1-4. The amp will derive a signal for you.

dBincognito · Post by **dBincognito** » Thu Apr 23, 2009 9:13 pm

M44's do the same thing....if you hook up channels 1 and 2....it actually puts a signal out to channels 1-4