Door speakers only produce bass?

[cdburnguy13]

My '99 C2 has the M0490 "Hi-Fi" Option with amp in the frunk and 6 speaker locations.  I am replacing an aftermarket stereo which has never sounded very good and has no built-in BT.  I am replacing with a Continental TR7412UB-OR for a semi-factory look.  I also purchased and installed the correct wiring harness conversion kit (verified by BergvillFX for use with front AMP with option code M0490). The dash and rear speakers always sound as expected (bass & treble), while the factory door mounted speakers just play bass at a low volume (on both L/R doors equally).  Is this normal?  This was true for both the older aftermarket stereo now removed as well as the new Continental stereo.  Volume overall is great and is LOUD even at level 10 or 12 volume setting so I suspect the AMP is working fine.  But it seems like I might be missing the treble (tweeter) pairs for the front doors on both sides or something else is wrong.  Or, is this perhaps somehow normal?  If it only happened on one side I would suspect a tweeter died but in my case it is same on both sides.

 

Any advice?

[Philip Baxter]

Hi. I had the exact same setup in my C4 with the continental & bergvill adapter. I’m no audio expert but believe that adaptor doesn’t have a fader (control of the independent volume of front and rear speakers) so maybe this is the issue..? I was never happy with the sound of the stock speakers and amp with the continental unit and adaptor, so now have a pioneer head unit with pre-outs to a new amp, 6 new speakers & a sub. Not the cheapest option (~£750) but sound quality is top notch now.

Both the continental & bergvill adaptor seem to sell very easily on a certain online auction site from my experience........ if you were to choose to go this route. I just don’t think you can ever expect much audio quality from the stock amp & speakers.

After a lot of research of my own I didn’t find any other solution than replacing the entire setup like I have. Just a bit unlucky to get a car with the optical amp.....


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[cdburnguy13]

10 hours ago, Philip Baxter said:

Hi. I had the exact same setup in my C4 with the continental & bergvill adapter. I’m no audio expert but believe that adaptor doesn’t have a fader (control of the independent volume of front and rear speakers) so maybe this is the issue..? I was never happy with the sound of the stock speakers and amp with the continental unit and adaptor, so now have a pioneer head unit with pre-outs to a new amp, 6 new speakers & a sub. Not the cheapest option (~£750) but sound quality is top notch now.

Both the continental & bergvill adaptor seem to sell very easily on a certain online auction site from my experience........ if you were to choose to go this route. I just don’t think you can ever expect much audio quality from the stock amp & speakers.

After a lot of research of my own I didn’t find any other solution than replacing the entire setup like I have. Just a bit unlucky to get a car with the optical amp.....


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Thanks Philip, I appreciate the insight.  While not what I was hoping, it's not at all a surprise.  In my case, the Continental will likely stay in place  as it does provide the Bluetooth I was lacking, and generally speaking the audio is now serviceable in the car.  It's all relative I suppose.  I went from terrible sound with no BT to decent sound with BT.  It's still an upgrade in my book and cost me less than $200 all in and looks somewhat factory correct.  Maybe I'll look into a new amp at some point when I'm ready to upgrade the door woofers.  For now, I'll sink my savings into all the other updates I still have on my list. Thanks again for the reply.