Subs/Amp ?

I have a JBL 1200.1 that is getting 14V and 4V through the RCA connections, and all fuses have tested good and all lights indicate that it is powered up however I don't get any sound from the 2 subs that are each wired individually from the terminals on the amp to each speaker. My deck is an Eclipse 8443 Brand new. I connected the RCAs to the Non-fading set of RCA connectors on the rear of the deck. Does anyone have any suggestions as to why there isn't any audio from the subs? I did test the Subs connected to another system and checked continnuity also. Also the amp's inputs say front and rear if that matters. I tried connecting the single set of RCAs to each one according to it's channel color coded connectors and still nothing. Any suggestions???

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Loud Subwoofers only, do not make a quality car audio system, especially when they are worth more than your "car"

does your deck have the option to turn off the subs?  if so, have you checked this...also, does it have an option to control the level of output to the subs...if so, is it turned up? 

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How do you have them wired to the channels, and what are the subs (ohms and VC type)? Remember the BP1200.1 is a mono amp, even though there are 2 physical channels (they are internally bridged to make 1 channel).

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com

They are (2)10" M5 Diamond 101.8. I believe they are SVC and 8 Ohm ea. Funny thing I just tested the ohms when connected and the meter read 12 ohms each when power was on. It doesn't make any sense to me...?? They are each wired directly to their own set of outputs on the JBL 1200.1. UGGHHHH!

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Loud Subwoofers only, do not make a quality car audio system, especially when they are worth more than your "car"

If they're 8ohm SVC subs, and each is wired to it's own channel, then you're presenting 4ohm total load. Not much for that amp (the JBL BP1200.1). Because of the internal bridge, the way you have them wired is the same as wiring them in parallel (and two 8ohm subs wired in parallel equates to a 4ohm total load).

At 4ohms, your getting a max of 600 watts total power, or 300 watts per sub.

Something doesn't sound right with that reading of 12 ohms. Try hooking both speakers up to only 1 channel at the same time (you get the same effect with that amp as using both channels so no worries there, remember it's a mono amp) and take the reading again.

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com

The right set of speaker terminals at the amp are reading (negative 18.0 volts) and the left set of speaker terminals at the amp are reading positive 18 volts according to my digital meter. I don't understand why. Is this contributing to why I don't have any audio from the subs. BTW I removed the subs and checked all connections from speakers through box. Any suggestions???

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Loud Subwoofers only, do not make a quality car audio system, especially when they are worth more than your "car"

Plug the rca's into the front rca output and see if the amp comes alive, it's alive, it,'s alive, hopefully anyhow. This may tell us if it an amp problem or cd player problem. Do not meter the subs resistance with the wires still hooked to the amp, it will throw the reading out the window.

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Top Secret, I can tell you but then my wife will kill me.

I have tried plugging the RCAs into both sets front and rear with no luck. I metered the RCAs coming in to the amp and they were 4 volts. I measured the resistance at the speaker terminals of the amp WITHOUT the subs connected at all and got the reading above.

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Loud Subwoofers only, do not make a quality car audio system, especially when they are worth more than your "car"

This may seem obvious, but is the amp getting a remote on signal?

Yes it is.

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Loud Subwoofers only, do not make a quality car audio system, especially when they are worth more than your "car"

Put your meter on the ohm scale and read the resistance at the connector on the amp for each sub. Now there is no reason that you should not know if they are SVC or DVC. All you have to do is look on the back of the speaker. If they are SVC wire each speaker straight to the amp parallel. If they are dual 4 ohm coil subs you wire the coils in parallel and then go from either coil to the amp like I mentioned on the SVC method. If they are SVC then the amp will be runnning at 2 ohms which will be making 1200 watts. If they are dual 4ohm coil subs then the amp will be running at 1 ohm and will still make 1200 watts. That amp has no power increase from 2 to 1 ohm. Now unless the coils are messed up you shouldbe able to check the resistance at the amp with it off and have either .8 - 1.2 ohms if they are DVC or 1.8 - 2.2 if they are single. Before you write the amp off double check these things if its still not working after wiring the subs right. Run a little jumper wire from the + connection of the amp over to the remote connection. Still no sound, then movethe ground to another spot. Still no sound then pull the deck and make sure rca is plugged in and make sure its plugged in good on the amp. Also I the amp has line out jacks, make sure you are not using them instead ofthe line in. Good Luck. Keeps us posted.

by any chance you forget to adjust the INPUT level? fuse?

forbidden wrote:

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Plug the rca's into the front rca output and see if the amp comes alive, it's alive, it,'s alive, hopefully anyhow. This may tell us if it an amp problem or cd player problem. Do not meter the subs resistance with the wires still hooked to the amp, it will throw the reading out the window.

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pure BS ... if the system is off it wont throw jack off, pun intended

I dont think the subs are wired up correctly. Do what Full Forces said.. If you want we could draw you a diagram and you could try that. but make sure all 4 (2) + and (2) - are wired up on each sub..  Another thing you can try is get a regular speaker(one you dont care to blow).. Take the gain on your amp and set it all the way to its lowest setting.. Turn down all of your bass settings on your deck. Then wire up the regular speaker. turn on the deck and see if you get any kind of power out of it. I have the JBL300.1 so i know how that amp wires in its basic. Try that and keep up posted.

your deck puts out 8v and your amp only accepts up to 4v

Fullforce, the reason I recommend that the wires be disconnected is that many "noobs" try doing this with the system still running, while it may not apply to the person who posted the question, it may apply to a person who is reading the thread.

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Top Secret, I can tell you but then my wife will kill me.

bfog99, the output voltage of the deck should not affect the input stages of the signal chain at the amp. To me this sounds like the amp is in protection, be it from a pinched rca cable or a speaker wire or a speaker may have an open in it, not allowing the circuit to be complete. Try hooking any old speaker up to the amp with a new speaker wire and see if you get signal. Run a new rca cable over the seats from the cd player. Should the amp not come alive with a new rca and new speaker, you must try a new cd lpayer or discman to give a signal to the amp, if it works the cd player is the culprit, if it does not work, the amp is the culprit.

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Top Secret, I can tell you but then my wife will kill me.