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Old 12-10-2004, 03:23 PM   #1
PoorGuyX3
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More volume from new HU

Ok,
I just installed my new Kenwood HU, KDC-X879, and I ordered it from Crutchfield. Install went fine and everything works. I just do not have much volume. I can turn the HU to max and the sound is quite loud, but I would think it could be much louder.

I installed this line out converter from the back of the HU to, I guess, bring down the line out level to input levels for the HK amp.

I have the line out converter gain control set to max as well.

What has anyone else done when installing a new HU?? Is there a way to up the level of the signal going to the HK amp?? The HU has RCA output jacks, is there any type of adapter that would allow me to use those outputs instead of running everything through that god awful line converter??

Thanks for the help guys.
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Old 12-10-2004, 03:38 PM   #2
Technic
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Originally Posted by PoorGuyX3
Ok,
I just installed my new Kenwood HU, KDC-X879, and I ordered it from Crutchfield. Install went fine and everything works. I just do not have much volume. I can turn the HU to max and the sound is quite loud, but I would think it could be much louder.

I installed this line out converter from the back of the HU to, I guess, bring down the line out level to input levels for the HK amp.

I have the line out converter gain control set to max as well.

What has anyone else done when installing a new HU?? Is there a way to up the level of the signal going to the HK amp?? The HU has RCA output jacks, is there any type of adapter that would allow me to use those outputs instead of running everything through that god awful line converter??

Thanks for the help guys.
OEM HK amplifiers inputs are differential/balanced level. You need a converter that specifically transform your high level output from the HU to the Differential/Balanced inputs of your amp... any line converter is not enough. Check the Peripheral SVEN4 line converter, it is for Diff/Bal inputs and outputs.
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Old 12-10-2004, 03:45 PM   #3
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I usually get some RCA Cables, cut the ends off, and then solder them into the speaker level inputs on the aftermarket harness. This will give the OEM amplifier a cleaner signal.

I have seen this not work before as well, so if the volume is still too low, just go straight high level in to the OEM amplifier. This has worked well for us several times as well.

It's been five years or so since I have worked with a Kenwood, but I think they have an optional Volume Offset selector, which adjusts the output relevant to the numerical readout on the display.

Plus, I also think your Kenwood has low level Balanced Lines out, which should work very well with the HK stuff.


This should help you out!

Last edited by Jason@BavSound; 12-10-2004 at 03:47 PM.
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Old 12-10-2004, 04:52 PM   #4
Technic
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Originally Posted by Jason@BavSound
I usually get some RCA Cables, cut the ends off, and then solder them into the speaker level inputs on the aftermarket harness. This will give the OEM amplifier a cleaner signal.

I have seen this not work before as well, so if the volume is still too low, just go straight high level in to the OEM amplifier. This has worked well for us several times as well.

It's been five years or so since I have worked with a Kenwood, but I think they have an optional Volume Offset selector, which adjusts the output relevant to the numerical readout on the display.

Plus, I also think your Kenwood has low level Balanced Lines out, which should work very well with the HK stuff.


This should help you out!
Although there is no direct reference to balanced lines output according to the Crutchfield site of the Kenwood Excelon KDC-X879, it does say that the preamp outs are 5 volts. So maybe it will fix the input problem straight from the radio preamp outputs... I would still use a SVEN4 just to be on the safe side, though...

Also, there is this HU feature:

Quote:
Speaker Settings: The Speaker Setting function tailors the System Q Sound Control settings according to the type of speakers in your vehicle. You may select a Speaker Setting of "SP OFF" (flat), "SP O.E.M." (for OEM factory speaker systems), "SP 6*9/6" (for systems with 6" and 6"x9" speakers), or "SP 5/4inch" (for systems with 4" and 5" speakers).
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Old 12-10-2004, 08:26 PM   #5
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thanks for the feedback guys. I think I will just cut off the end of some RCA cables and splice them into the factory harness and bypass the converter all together. I was going to do that to begin with, but I wanted to see what this $30 converter, that crutchfiled claimed I had to purchase, would sound like.

I'll be sure to let you know my findings.

One more question... i'll be tackling the sat tuner this weekend. Any sugguestions on the easiest route to take with the cable that will run from the tuner to the sat reciever??

Thanks,
PoorGuy
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Old 12-10-2004, 09:40 PM   #6
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Not sure about the newer ones, but the earlier Excelon models that had the 5V outputs had an output resistance of 550 milliohms...which defeats the purpose of having a high voltage preamp. The Kenwoods had a high output resistance because of cheap components.

Maybe the newer ones are improved. And yes, I am bashing Kenwood...
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Old 12-11-2004, 11:29 PM   #7
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Well, I removed the line out converter and wired the aftermarket harness directly to the preamp outs of the new HU. Sound is cleaner, but still limited.

I've adjusted the volume offset on the HU to the max so that it will be as loud as possible.

so when you're turning up the HU, volumes markers 1 - 25 cannot even be heard. at 26, you can start to hear sound,but the HU maxes out at 35 and it's loud, but not as loud as I want.

I find myself turning the HU all the way to max all the time and it's just not enough.

Any other suggestions for beefing up the line in into the factory HK amp so I can get more volume??
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Old 12-12-2004, 06:13 AM   #8
Technic
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Originally Posted by PoorGuyX3
Well, I removed the line out converter and wired the aftermarket harness directly to the preamp outs of the new HU. Sound is cleaner, but still limited.

I've adjusted the volume offset on the HU to the max so that it will be as loud as possible.

so when you're turning up the HU, volumes markers 1 - 25 cannot even be heard. at 26, you can start to hear sound,but the HU maxes out at 35 and it's loud, but not as loud as I want.

I find myself turning the HU all the way to max all the time and it's just not enough.

Any other suggestions for beefing up the line in into the factory HK amp so I can get more volume??
Your HU preamp outputs are not balanced/differential level, thus the mismatch. You will need the SVEN4, which have adjustable input level and capable of handling balanced/differential inputs/outputs.
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Old 12-12-2004, 02:09 PM   #9
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Take a look at an AudioControl line driver. It has both types of ins and outs and has a fair bit of boost at the outputs.

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