Should I keep a unit's internal amp on when I already have two installed?
Hello. I am getting a new Kenwood head installed and have a question about amps. The unit has a 50W X 4 internal amp. I have an amp for my sub and one for my mids and highs installed already (not sure of the wattage but the power is there no doubt).
The unit has the option of turning off the internal amp. Is there any advantages or disadvantages to keeping it on or just turning it off and using the others?
One installer says to keep it on and I will keep a bit more power, the other says just leave it off and let the other amps do their job. I would appreciate any advice here.
The model of the unit is KVT-512 which is new and not listed. I just put this down since it must be a similar unit.
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Re: Should I keep a unit's internal amp on when I already...
Some models the internal amp is for the actual speaker wiring and not the rca jacks like you use to feed the amp for subwoofers.
you need to check and see how much power your amp can handle coming in. I would say cut it off and use your other amps
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If you have a separate 'power' or sub-woofer amp, check that it still has power and did not blow a fuse. Is there an internal selection inside the unit for enabling the internal amp vs an external amp? Some will disable the internal amp using a setup setting, and just provide low level output that is expected to be amplified by an external amp. If it 'forgot' you might have to set it to use the internal amp again. Or vice-versa, depending.
1) Pull your speaker wires, grab an ohm meter and confirm that each speaker reads 4-8 ohms nominal impedence.
2) Ohm out your speaker wires to chassis ground & confirm no 0 ohm (short)
3) Confirm 12 volts plus at amp power wire. Low voltage will send amp into protect mode.
If speakers are disconnected and amp turns on, look for a red led. If red then you have an internal problem that is protecting the amp.
If going into protect mode due to internal issue, then it's time for a new amp.
Also, you will need to use a "line out adaptor" in order to covert from speaker out to low level (RCA) input to amp. Too much voltage from head unit can fry the pre-amps in the amp.
And yes, I'm an electronics tech and yes, I know my stuff on car audio:)
Just a side note, never confirm a fuse as good by sight:)
It might be. Normally protect turns on when you have something wrong. A power wire goin in the ground or polarity of the speakers (+/- wires) are crossed or especially if 2 speaker wires are touching. If not hooking up the 2 green speaker wires for example, dont twist them together. seperate all non used wires
First off try a different source that you know works that you can control the volume of. (ipod) This will tell you if the amp works. If it still doesn't work try a different speaker that you know works, any speaker will do, just keep the volume down. Second see if running a new set of RCA's helps maybe something got pinched if it still is not working then your head unit line out is bad, try a different output and see.
I fixed the sound problem with tech support from Kenwood. I had the blue wire from the Kenwood which is the antennae turn on wired to the amp turn on for the vehicle (2001 Blazer with Bose factory stereo). This is how I was told to wire it from the installation tech where I purchased the wiring harness. The tuning played fine because the Bose amp turned on when I played the tuner but when I played the cd or aux the amp turned off, thus no sound. The kenwood tech toldd me to wire the blue/white wire to the amp turn on for the vehicle so the amp would be on when ever power to the Kenwood was on. I rewired this way and everything works great now.
Yes, the Kenwood KDC MP-235 has two (2) line level outputs (RCA types red & white). However, these outputs internally passed through an electronic crossover/filter making them appropriate for subwoofer amps only.
If your unit is an MP-235CR, then the same outputs would be for the rear amp (not subs) and are full range (unfiltered).
If indeed your unit is an MP-235 and if I may make a suggestion, still connect the Kenwood to four (4) speakers. It would not be technically correct to leave the internal amps operating with no load (speakers) connected. Additionally, you would be getting 200 watts (4 X 50) more to your system (since it is already there).
If your Bose amp & speaker are subs, then no issue, however if the Bose is for a full range of speakers, then only the woofer part would be working efficiently.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Currently you have the blue wire from your Kenwood head unit connected to the blue wire in the Chrysler wire harness adapter. You need to disconnect this wire, and reconnect it to the blue/white wire coming from your Kenwood head unit instead. You probably already have the remote wire from your subwoofer amp connected there; both wires need to be attached to the blue/white Kenwood remote output.
Your LHS is equipped with a factory amp. The blue wire in the Chrysler harness activates the amplifier, but it's connected to your Kenwood's power antenna activation output; therefore it's only being turned on when the tuner is selected.