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Old 06-23-2000, 11:53 PM   #1
Billy
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Join Date: Apr 2000
Chapter/Region: E. Canada
Location: Toronto, ON
Vehicle:
1997 GF - silent ed.
12.677@107.87 untuned

Question Effect of rear mounted misbasses on front soundstage?

Does anyone run dedicated 8" or 6.5" midbass components (not full range co/tri-axials) on the rear shelf of their RS? By this I mean that the signal they get is that of the "typical" midbass unit (ie. 80Hz to 275Hz; or thereabouts) crossed over using either active/passive means or a combination of the two.

Can the soundstage be made to sound right to someone sitting in the driver's seat in this case or is it ruined to the same extent as having coax's in the rear? Subsonic frequencies are not localizable but midbass...hmmm, I would suspect localization of midbass is easily achieved but perhaps not as easily as say localizing a 1KHz tone.

The reason I ask is because I want my system to sound loud but have a good nice realistic soundstage up front and not have any flat spots in the frequency spectrum. Most car systems lack midbass because those frequencies aren't represented as much. I don't like the sound of subs crossed over at anything over 100Hz so having the subs do midbass duty is not an option. Mind you I will play with the settings... why not? :-)

I plan to go with either Boston 6.5" coax's or separate midbass drivers in the rear crossed over accordingly.

I am also worried about the impact a tuned vented box containing 2 12" competion subs, with both speakers and vents, firing towards the taillights may have on the rear shelf speakers' available excursion, thus I'm tending towards stiff suspensioned midbass components.

No I haven't pieced the system together yet but hopefully soon. Any ideas would be most appreciated!

Thanks!
Billy
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Old 06-24-2000, 10:36 AM   #2
ColinL
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IMO midbass in the rear pulls the soundstage back. I generally run rear speakers as rear fill only or delete them altogether.
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Old 06-24-2000, 02:21 PM   #3
dada21
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Anything over 150hz in the rear will destroy your imaging. I myself prefer to keep everything about 60-80hz up front, and 60-80hz and below in back.

The biggest "destroyer" of good imaging is vibrations and other harmonic distortions of the low bass that have been vibrated into upper bass or worse. The Subarus are built like crap and everything vibrates, so you have to tackle this first.
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Old 06-24-2000, 05:54 PM   #4
John2.5RS
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Your soundstage will sound better with front mounted midbass. It will pull the lower male voices towards the back with rear mounted midbass if you are planning a 275hz x-over. The deepest male voices are around 150hz so you might be able to work around those numbers if you do go for the rear midbass.

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Old 06-25-2000, 12:19 AM   #5
Billy
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Thanks a bunch for the input guys! All the signs point to getting all the non-subwoofer specific frequencies out of the front components in order to construct a nice soundstage.

I opted for 6.5" Boston Rally RC61 components in the stock mounting locations up front for my MY2000RS sedan. Hey Rally speakers for a Rally car, who woulda thunk? :-) They get 75W RMS each but it is as if they aren't sealed properly because I get NO midbass from the fronts. Don't know if the shop that installed them for me sealed the woofer frame baskets to the doors' plastic cup housings whatchamacallit properly... or maybe the door panels themselves don't provide a decent air seal?

When I switch the RC61's x-over pt. a bit lower, say 50Hz or play them full range, I can feel the speakers shaking and buzzing the doors so the excursion is there but still no midbass never mind low bass. Hmm.. can you say infinite baffle?

One day when I stop playing around, custom made kick panels will be the way to go!

John2.5RS: Yah I read somewhere that buzzing/rattling is what causes the greatest deviations from a flat frequency response in car stereos seups. Too bad our Subies are buzz happy. My friend has an A4, what a solid feeling/sounding car!
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