Hi guys, just upgraded from DLS MS6a comps to a Hybrid Audio Clarus C61-2 set being run passively off an mb quart dsc4125, sourced with a CarPC. I am having some issues with harshness in the tweeters where the S sounds are very piercing, especially at higher volumes (I believe this is called sibilance). I have contacted Bob at Hyrbid (who has been great so far!) but I figured I could post here as well for additional feedback or tips. My email to him is pasted below with all the pertinent information.
So I was finally able to get both speakers installed. The midbass is much improved! I may still try and open things back up and add additional sound deadening to the doors. If you recall, I am using a car computer with an onboard DSP to provide the signal. The crossover allows me to select a combination of up to 5 HP/LP/BP/notch/shelf EQs per channel. However, instead of providing a 12/24db slope, I have a Q-value to adjust the slope. Currently it's set to HP at 65hz at a Q of 1.01. I also have the option of an individual 5 band parametric EQ and a standard 10 band EQ per channel.
The biggest problem I am having now is harshness or sibilance (S-sounds and high notes are very piercing), which is causing me a great deal of fatigue at lower volumes and is nearly unbearable at higher volumes. Both tweeters are still at -3dB on the passive crossovers, mounted in the factory door locations of my 2000 Solara. The passenger tweeter is maybe only about 10 degrees off axis to me, and the driver's tweeter is more or less pointed at the steering wheel.
So far, I have experimented with EQing down all bands from 3khz-16khz an additional 4-6db, however this is making the music sound flat and lose its detail. I have also tried reversing phase on one or both tweeters, which has helped some but still not solved the problem at higher volumes (is it worth trying to reverse the phase of the mids since they play to 5.5khz?). Pulling the tweeters out of the doors and placing them on the dash at various angles did not help either. Interestingly, pulling out the tweets and letting them (gently) dangle pointed towards the floor helped more than anything. Of course, this is not a viable option. As a reminder, I listen to mostly electronic/house music which tends to be bright, quick, and loud. The songs are 320kbps MP3s (not perfect, but unfortunately the best available for this type of music). However, with that being said, the harshness was never an issue with my older DLS MS6a set.
Ideally I would like to stick with running them passive, but if you think a different (larger?) tweeter would help, or higher/lower crossover points, I can work on switching over to active and try that. I haven't done that yet because I am doubtful that simply attenuating the tweeter volume will solve the problem (because I believe the EQing I have done so far roughly mimics tweeter attentuation).
Any guidance you can provide would be great. I REALLY want to like these speakers especially since the mids sound fantastic, but I can't really bear to listen to them the way they are right now. If you prefer, I am available on the phone in the evenings after 5pm and all weekend.