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How do you improve bass response in a null?

My listening postion on the sofa is unfortunately in somewhat of a null, thereby reducing bass reponse. Since I use the room for both 2-ch & HT, I like my position to be centered on my 53" RPTV, which by necessity has to be centered on the front wall.

How does one reconcile optimal sound with optimal viewing angle? If I were to move my position on the sofa, I'd have to slide both speakers in the same direction in order to stay centered between them. While doing this, it would upset the balance for home theater, not to mention having one of the speakers blocking a portion of the screen.

Is there a simple solution to this problem that I'm not realizing. If the centerline of my room is a null zone for frequencies around 40hz, would moving the sub have an effect. Or is this room location always going to be in a null zone regardless of the sub's position?

Anyone got any theoretical or practical experience with this problem?

Thanks.
kenl

Showing 2 responses by sedond

sedond
1,387 posts
 
run a pair of subs in stereo. easier to get a more natural low-frequency soundstage, & easier to set up to avoid room nodes, imo. added benefit is much cleaner sound, due to much less distortion for the same spl. especially important if you're not using subs w/such low-distortion/hi-output ratings as vmps... ;~)

doug s.

sedond
1,387 posts
 
hi ken,

as each of these subs has different amplification & crossover electronics, i'm not sure what the best solution would be, for you to run a stereo pair. i suggest you try to match up the two subs that have the most similar cross-over point/slope to do this. but, i honestly think it would be dumb luck, if it worked. it might be easier if you ran the monitors full-range...

of course, i am referring to audio - i have no suggestions at all as to home-theatre, altho i know the accuracy & distortion-free output isn't as critical.

if you're really serious about top-notch 2-channel audio & want subs, i strongly recommend a *matching* pair of subs, at the very least. of course, my preference is well-known to those who frequent these forums - i prefer passive subs, an active outboard electronic x-over, & separate amplification. i believe you then maximize the quality of the electronics at the least cost, and it also is really the most flexible, tho it may not seem so at 1st.

i'm a cheapskate, primarily shopping used, cuz my taste exceeds my budget! ;~) but, in the case of my subwoofer set-up, i bought mostly new. why? because it was far & away the best performance for the money, & what i got rarely shows up on the used market. i bought the subs & x-over brand-new, using an old adcom gfa555 amp i already had, & buying a second adcom amp, just for overkill, & cuz i could afford it! :>) i got my fully-optioned vmps larger subs, marchand xm-9 x-over w/upgraded op-amps, the two adcoms, & the cabling for a bit under $2400. this is *serious* bass for audio; i can only imagine what it would do in a h-t set-up... ;~) and, w/the marchand x-over, it is amazingly flexible - i've successfully had speakers as diverse as thiel 3.5's, & proac response 1sc's seamlessly intergrate into my ~25x38 listening room. i wouldn't trade my set-up for a pair of rel's top-line offerings. i might be interested in auditioning a pair of bag end d18's - their models w/the 18" drivers each, along w/their $2600 elf x-over - if i won the lottery! :>)

go to vmps' www & check the distortion & output specs of their subs - truly world-class; nothing else even close at anywhere near the price; only a couple approach 'em, at *any* price.

doug s., yust a satisfied customer...

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