Marine Electronics Forum - amp connection question

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BlenderBoy
03-22-2012, 07:51 PM
Never owned an amp so be gentle if this is a dumb question. ;?

My head unit has front and rear rca outputs but no sub output.

Looking at the JL MHD900/5, there's a switch for 2/4/6 channel input. Obviously, I would choose the 4.

My question (actually one of many) is: Does the amp automatically use the signal from those 2 sets of stereo channels to create the sub out mono channel? If this is so, then I should still be able to fade from the HU, correct?


seabob4
03-22-2012, 08:47 PM
Are you sure you don't have AUX out and AUX in? That's what I would think you have. Why would you think front and rear?

AUX out is what you need to hook up the amp...

Glen E
03-22-2012, 08:51 PM
yes.....


read the manual

2 and 4 are high pass filter settings
6 is low pass....


BlenderBoy
03-23-2012, 12:12 AM
Are you sure you don't have AUX out and AUX in? That's what I would think you have. Why would you think front and rear?
AUX out is what you need to hook up the amp...

Looked at my JMS2212 manual online and the diagram had front rca red & white out and rear rca red & white out, but no sub out.

http://www.jensenmarinedirect.com/jensen-waterproof-am-fm-ipod-iphone-sirius-satellite-radio-ready-stereo-with-usb-input-noaa-weatherband.html


yes.....


read the manual

2 and 4 are high pass filter settings
6 is low pass....

Didn't read the manual on the MHD900/5 yet, but I did look at a review on crutchfield that was talking about it's features. Sounded like that was the case, but wanted to make sure before spending $900 on an amp then finding out that the head wasn't compatible.

I was also reading articles on car amp installations and when people asked the same question, the reply was to use rca y-jacks. Then I read the crutchfield review and it sounded like I was in business without y-jacks.

bradv
03-23-2012, 01:53 AM
U can do it with y adapters or u could just run a single rca to the amp from the head unit. Like u said it'll not allow u to fade but u can always adjust the settings on the amp if u want the front or rear to be louder but chances are ull want them all the same.

MB Marine Electronics
03-23-2012, 05:44 AM
When you use the 4 channel mode on the amplifier you will still have fade control over the 4 channels but the subwoofer will not fade in or out because it will get its signal from a sum of the 4 channels. This is the best way to do it with what you have.

JoseG
03-23-2012, 05:51 AM
I've seen this on a Sony Head unit, and it was wired exactly as Brad describes, using Y connections to input to the Sub,

Glen E
03-23-2012, 05:55 AM
fade the sub with part # HD-RLC - level control for ch 6

thee should be no need for y's as front will be ch 1 and 2 and rear will be 3 and 4...straight in...

BlenderBoy
03-26-2012, 09:44 AM
When you use the 4 channel mode on the amplifier you will still have fade control over the 4 channels but the subwoofer will not fade in or out because it will get its signal from a sum of the 4 channels. This is the best way to do it with what you have.

thanks

BlenderBoy
03-26-2012, 09:45 AM
fade the sub with part # HD-RLC - level control for ch 6

thee should be no need for y's as front will be ch 1 and 2 and rear will be 3 and 4...straight in...

very nice. i will get one. thanks.



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