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whoom instead of BOOM

hi everyone. new into home theater(though been running loudspeakers off a tv since the early 80's). anyway, i'm having a problem with the low frequencies. at the volume at which i get the spls i want(pants rattle a bit, couch vibrates etc.) i get a whooom response and not BOOM and lose definition and clarity. is it possible to acheive these spls without the "whoom" mucking it all up?
the room: 35x25x10 it is not closed in completely
the system: mirage m5si fronts, mirage 595si rears, mirage om-c2 center, mirage bps 150i sub(also working with dialing in a polk psw12 sub together), onyo txds797 processor. the front end is a panasonic dvd-s97.
THANKS!!
uncertainsmile
shadorne's avatar
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shadorne
7,477 posts
 
Don't know what you mean by whoom....but if you want to rattle the windows and couch and feel the sound pressure on your pants then you need one if not two big subwoofers with 15 inch woofers and 500 watt amplifiers and huge drive motors. I assume you want a room filling sound with excellent transient response rather than just the typical resonant dull whooom you get from most subs(especially ported subs).
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dbphd
1,631 posts
 
My Velodyne HGS-15 is crossed at 80 Hz. It blends seamlessly with my KEF 104/2s, generates that subtle vibration you feel at a pipe organ recital when a big pipe is opened, and can make you feel pressure on your chest during explosions in certain flicks. With a 15 inch woofer, 1200 watt DC amp, and huge motor, it meets Shadorne's specifications. In my application, a 19 X 14 X 8 room, an Auralex SubDude base greatly improves the sound, removing boom and seeming to extend the low end. But it is a 100 pound cube when you want to move it.

db
uncertainsmile OP
88 posts
 
thanks guys. just to clarify a bit. "whoom" is trying to describe lf passages that are lacking attack. they're loud but have no definition and totally drown out other lf tones during the passage. i'm just wondering, does everyone have a volume point at which their room acoustics and or equipment turn to this type of response, instead of detailed well defined bass?
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shadorne
7,477 posts
 
I reckon Dbphd has the solution...get a big Velodyne HGS-15 (or two). Small subs just can't handle the transient energy above a certain point (around 100 db which is not loud for frequencies from 20 to 40 Hz) and run out of gas at too low an SPL to be convincing in a large room - they end up lacking definition.
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