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In Reply to: Cool Bob - more... posted by jvr on August 16, 1999 at 14:50:59:
: Glad to see you back Bob. And you're right, the sound is crap, but the driving experience is awesome. I'm about 80% done with my upgrade. All the equipment is in, but I'm still messing with the sub position and routing of the remote volume control - oh and configuration too.
Never really left. It's just that I don't get to the boards every day due to time constraints. I'm supposed to be working ;-)
: I've currently got the 310RS sub firing through the ski-hatch, wired in parallel mono, bridged 7/8 channels, crossed over at 45hz, and mounted in a Q-Logic sealed box. I find the sound tends to bleed in to the front imaging and cancels out the stereo image when fired through the hole. Do you think wiring it in stereo (5/6 coil 1, 7/8 coil 2) will help this? I can't see how it could, but what do I know.
Best thing is to try a lower crossover point. I'm using (approx) 65Hz low pass for the sub, and there is no real image problem. Of course I'm using a P2110 for the sub, which has a 24dB/octave option, which is twice as steep as the P840's 12dB/octave. This helps cut the midrange out of the woofer much more quickly. You might run into a problem getting the sub crossover high enough to blend smoothly with the satellites yet low enough to not affect imaging, but this will be trial and error to get the best compromise. Turn up the amp gain a bit as you reduce the crossover frequency. Also try reversing the polarity of the woofer relative to the front system and see what happens acoustically. Stereo vs. mono should not really help.
: Prior to this setup, I had it just in the trunk firing towards the back of the seat. I found I had to crank it WAY up to get the sound in the passenger cabin, but it was tight and non directional - which I prefered. Front imaging was much better with this configuration.
The seat cushion and car between the sub and your ears was acting as an acoustic low-pass filter, blocking the upper frequencies from the woofer.
: I also think I may have damaged the coil as I hear some crackling when I crank up the volume. Is this possible? I mean I have only 120w going to it. It should handle 600w from what I read.
It's REALLY hard to damage a 310rs from just a little extra volume. More likely is something physical, like a wire touching the back of the cone (check the routing of the tinsel leads, the little wires that run between the terminals and the cone). It also is possible that you are running out of amplifier power, and you are hearing amplifier "clipping". The last wild card is that it is not impossible that a portion of the dust cap has come loose along its perimiter and is flapping against the cone. Rare but possible.
: My next step is to remove those port holes from the DSP system's sub and see how that works. I may consider trading in the 10" single for two 8" subs and mount them under the deck firing up. If I need to that is. I rather not lose all that trunk space. Maybe I'll do one of those custom boxes that fit in the battery compartment. I rather test stuff out with the Q-Logic box before investing the time in a custom box I may not like. Already been there once!
: Any ideas?
Well, with the caveat that I haven't actually tried this, my instincts tell me that the box in the battery corner, with the DSP port openings open, has the best potential. That's where I'd start if it was my labor. (Since I'm inherently lazy, I like to start where I think I'm going to finish ;-)
Best regards,
Bob
: Jeff
: '99 528i Sport
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