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using 2 subs: do they need to be the same?

i'm wondering about adding a second sub. do they generally need to be the same size woofer, make, model, etc. as long as they are playing below 80hz? as far as placement goes, can they be placed directly under the monitors (which would be on top of specially designed stands to accommodate this), as if they were part of a single pair of floor standers. i have read here that they should be asymmetrically set up, but how is there use different than a single pair of speakers with integral powered subs, at least as far as worrying about troom modes go. as always, thanks for any advice.
thomp9015
johnk's avatar
johnk
1,975 posts
 
No they do not need to be the same. I would place where the subs sound and measure best in your room. Under loudspeakers might not be the best sounding place for them but then again it could be, you will need to mess about with placement.
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thomp9015 OP
79 posts
 
thanks you two, that's interesting and helpful
thomp9015 OP
79 posts
 
by the way,i have just a two channel rig and no lfe output. does anyone have any insight into why that would be needed to use two different sized subs. thanks again.
thomp9015 OP
79 posts
 
another question, if using speaker level high pass connections, does one use only one set of speaker wires for the two subs, i.e., does one use only the left terminals on one sub, connecting to the amp's left speaker terminals, and repeat that for the right sub and amp terminals. or alternately, should one use two sets of wires thus employing all four binding posts on both subs and requiring doubling up two sets of wires on the amp terminals.

thanks
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