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Sub cancellation issue
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04-29-2015, 10:11 AM | #1 |
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Sub cancellation issue
Ok Iam running a jl audio stealthbox in my e90 off of a Digital Designs SS1a amp wired with the technics Logic 7 harness but am having a weird cancellation issue. Anything over 50-60 hz seems cut unless I wire the subs out of phase. Has anyone else had any issues like this?
Thanks all!
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2009 118i Monaco Blue "Maximillion"
2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car |
04-29-2015, 11:24 AM | #2 |
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I don't know how the stealth box is mounted but I had cancellation issues with my JL sub firing inward towards the cabin through the seat pass through. I originally had it mounted facing to the rear, which increased cabin gain but gave me issues with time delay (using simple RCA patch so non-adjustable). When I faced it in towards the interior I expected that I would have some cancellation issues when wired normally, which I did, so I've been running it with the phase reversed ever since with no issues.
In my case it seemed that the sound pressure generated by the JL sub and the sound pressure generated by the stock speakers/subs were working against each other when all of the speaker cones were facing inward. |
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04-29-2015, 11:44 AM | #3 |
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The jl is rear facing on the stealthbox. Maybe the Logic 7 is doing something that causes the stock woofers to run out of phase.
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2009 118i Monaco Blue "Maximillion"
2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car |
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04-29-2015, 08:06 PM | #4 | |
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Quote:
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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04-30-2015, 12:42 AM | #5 |
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Thanks, I was also going to look at bringing the Frequency up on the underseats to around 80hz or so. It will be easy to stick a passive filter inline using the technics harness.
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2009 118i Monaco Blue "Maximillion"
2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car |
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04-30-2015, 06:45 AM | #7 |
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Better to amp them. You'll be very surprised how good they sound once you add the power, plus you'll have a "free" HPF which works better than an in-line filter. If the filter is 24dB/oct, I'd recommend a 55Hz crossover point, or 80Hz with 12dB/oct.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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04-30-2015, 07:51 AM | #8 |
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All stock.
I know the L7 underseats are very capable but I really wanted to keep them on the stock amp. I think I have a 80hz 12db passive pair in my stash that I can connect up.
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2009 118i Monaco Blue "Maximillion"
2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car |
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05-01-2015, 09:48 AM | #9 |
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I dropped the cover frequency for the sub and I cleared up a bit of the cancelation. I found that I have a set of 12db 80hz Passives that I will try out but I need to first see if I can find a molex plug that will match up with the technics harness plug so I don't need to cut mine.
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2009 118i Monaco Blue "Maximillion"
2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car |
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05-01-2015, 11:38 AM | #10 |
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I haven't tried every combination but I have found better results with 90 degrees out of phase (12db mid bass & 24db sub bass slope) than in phase (24/24). Kaigoiss I think runs 180 degrees out of phase (12/12)
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