I recently bought a 2001 LC for the wife and we have the dreaded excessive bass problem. Apparently this only applies to the 2001 LC’s with the JBL 6 disk system. The problem is a booming bass. There is significant distortion and you can't listen to any FM or CD music. No adjustment to the bass or treble compensates. The JBL amp is defective. My understanding is that the original concept was to boost the bass to mask the engine hence this problem is with the engine running only. It does not occur with the accessory key on. The fix is an updated/exchange amp from Toyota per the TSB. I spoke with C-Dan and the replacement cost of the new amp is 600 bucks. I was hoping someone else may have discovered an alternative route on how to correct this. Since it only happen then the engine is running I was hope there might be another way other then replace the amp, thanks.