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View Full Version : Midbass distortion : not enough to keep up with highs



simonhaha
22-09-2012, 06:49 AM
Hey guys,

I know there are many audio questions similar to this, tried searching but still couldnt find my problem.

I was running cadence XS-6k (200watt peak) splits with pioneer GM6500F (60RMS x 4 ch). High pitch notes are nice and crisp but when it comes to midbass being turned up, it distorts like crazy when put up louder.

So what i tried was, i bought a set of JL2600 (60RMS, worth 2times more than my cadence ones) and dynamated my doors with Dynamat Extreme mats. Plus i found a better grounding point.. My wiring seems to be fairly average, it is running away from the powercable and made sure my gains arent set overly high...

RESULT: I tested the side with dynamat and JL Speakers againts the other door with just the Cadence splits with no dynmat. Midbass just came out just as shocking for both splits.... although the vocals sounded a bit better, it wasnt a lot of mid bass, but it wasnt enough to keep up with the quality high pitch sound i was hearing...

Any advice and guess appreciated, please help!!

Thanks

Tee Jay 2
22-09-2012, 07:32 AM
I had a similar problem some time ago and ended up replacing the crossovers. Problem Solved. Might be worth looking into.

simonhaha
22-09-2012, 07:44 AM
Thanks teejay but the crossovers been replaced when i got the new jls. The certainly look more sophisticated than my old cadence ones

bellto
22-09-2012, 02:14 PM
i had a problem in my old car like this but it was with the sub woofers. i replace the subs twice, and it still distprted like crazy even on low volume. turned out it was the amp. replaced that and away she went.

have you got a spare amp handy?

MattVR-X
22-09-2012, 02:40 PM
You're sending maybe 10wrms to the speakers and as such are clipping the crap out of the deck to try and get volume.
Grab a cheap 2/4 channel amp.

M4DDOG
22-09-2012, 02:56 PM
You're sending maybe 10wrms to the speakers and as such are clipping the crap out of the deck to try and get volume.
Grab a cheap 2/4 channel amp.

He's running a GM6500F as per the original post.....

I'd be checking your high pass filter settings on the amp itself, you may have the HPF set too low (or not at all). Make sure the amps range isn't set to "full".

The other option as a last resort is lower your tweeter intensity (your crossovers should have a -3,-6 terminal).

SH00T
22-09-2012, 06:13 PM
Easy, process of elimanation, take of your door cards, try it, still does it, check your mounts, wind the gains down, all the way....try it.
Set you cross over, high pass sub 63, low pass speakers, 80 hz...
But a really smooth xover, 80 sub, 100 or 120 mids, if you have cut offs staggered, like sub 12 db per octave, and the mids 18 db per octave will avoid frequency cancellation....

I've not seen many distortion problems, gains most likely, and striking the door card next....

MattVR-X
23-09-2012, 03:10 PM
He's running a GM6500F as per the original post.....
Didn't see he already had the 4 channel.

My post might still apply, though. Gain on the 4 channel might be too low / too high. 50wrms through the midbass should be more than enough to keep up with any tweeter that a normal human being could stand, unless OP is slightly deaf toward high frequencies and as such can handle insane loud 10-15khz sounds.

Otherwise might be like you said, and the amp's trying to push 30hz through 6.5s.

ADM
25-09-2012, 07:59 PM
Could be that the tweeter may be way more efficient than the midbass driver (this is actually quite common on car audio components).

Perhaps you could attenuate the tweeters output (usually done by an L pad ( 1 series resistor followed by a parallel resistor to keep impedance the same). You can google for online L pad attenuator calulator to work out what resistor values are needed for the desired dB drop (typically -3dB) using common 5 watt wire wound resistors from any local electronics store).

simonhaha
02-10-2012, 12:49 PM
Think ive found the source...

quick question guys, can the short ground wire cause any distortion to the RCA and speaker wires?

cause its kinda running along each other?

And if i got scrunched up groud wire cables running under the amp, would that cause distortion too?

other than that the power wires are run on the left side (where the battery is) and the rca and speaker wires run on the very right

simonhaha
02-10-2012, 01:10 PM
double post..