Originally Posted by Cam Man
RD is exactly right to say boosting below the 60Hz range is big trouble (in small room acoustic environments). In fact, I don't know of any situation where LF EQ is not strictly a reduction of areas of higher energy.
What are your guys' opinions about the issue of low extension verses high SPL output in the 35Hz to roughly 70Hz range? Typically, the size subs we live with at home are not capable of both with accuracy and low distortion. Has design technology changed that? The Synthesis S1S-EX is one that can do both very well, but it's huge as it's design basically comes from the pro cineama line.
Originally Posted by Wrager
Partly the reason for using an AT screen. I have a 5749 behind mine. It's roughly equivalent to 2 x S1S.
In JBL land, there are six paths you can go by.
S1S-EX (or 4645C from the pro cinema line, plus there are some older 18" cinema units around, too)
I have all of these except the LSR6332 and 1500 Array. They simply cost too much new, and I cannot find a super deal used.
Of the two, I'd take the LSR first.
My Performance Series utilizes four PS1400s stacked with PT800s running full range down to 40 Hz, plus four HTPS400s running below 40 Hz. Even though the HTPS400s are 12" drivers, the rigid anodized cones are good to low 20 Hz in those sealed cabinets. The 1000W amps help. Notice the limited frequency range I'm asking the HTPS400s to handle.
I've got two S1S-EX and two 4645C units in my HT, and that means incredible power, accuracy, low distortion, and control. They're handling from about 80 Hz on down.
In both the S1S-EX and HTPS400 instances, none of the individual units are working all that hard, but calibrated and properly placed, the synergy is incredible. The bass is very well distributed around the room, and it's in phase, coherent, and profound. One sub couldn't really accomplish anything close to that, though one could get one big sub to do a lot of booming by itself it that 's what someone wanted. Notice the limited frequency range I'm asking these subs to handle.
I've got a pair of S2S subs supporting my K2 S9900 pair below 50 Hz, and a pair of PS1400s working the ULF duties with a of a pair of actively bi-amped XPL200As below 60 Hz. Notice the limited frequency range I'm asking it to handle.
Also, right now Harmansuaio.com has some old S3S subs for silly low prices. That's a 12" driver in a ported box. Bring your own amp, just like all Synthesis® subs. The LE120H-1 is a very capable LF driver, and I've got a pair of those supporting an S/2600 stereo pair below 60 Hz. Notice the limited frequency range I'm asking it to handle.
I guess the message is this: the less you ask a LF driver to do, the more it can do for you.