WarningnLong, OT postbut I was asked ..so ..
Greg
The basics of this are something most audiophiles know but resign themselves to/with... The best position for staging/imaging is rarely if ever the same for best bass... We all know it, we all have experience it but we do think somehow that our speaker position is the best compromise... It has come to me through research that this compromise can be avoided.
I hope you don’t mind my retracing my path to this:
The Magnepan are truly full range. Properly positioned and with adequate amplification, they will move air in a most surprising way, pant-leg-flapping-type of bass with a degree of realism if not impact, that most cone speakers rarely manage. That always came at th3 expense of staging … Often I would get great bass but the 10-feet big mouth syndrome that line-sources are often criticized for. IOW the images were too big... Oh! They were very satisfying on big orchestral works... Mahler on Magnepan is a match but smaller combos suffered from well no longer being so small… So I tried a sub and this for years... It never seemed to work well with the planars... I got to the audiophile conclusion and myth laden that it would “never” be possible to marry a subwoofer with the “fast” planar … But I was using just one sub …
Fast forward 2 years back, 2008. I have been reading the work of Floyd Toole and Sean Olive and they came to the conclusions that several subs were better than one … Interesting thought I so I tried... With the subs in the usual Left and right and the subs working in augmentation… i-e the Main playing full range but positioned for staging with the back wave heavily absorbed and the subs crossed rather low (around 40 Hz) but flanking the mains.. Then I read about Earl Geddes in an interesting discussion he had with someone from DTS (the Company) about Stereo Bass (on AVS) and read his point bout multiple subs in extremely non symmetrical configurations: One in the back corner behind the speakers, one somewhere halfway between the listening position and the speakers plane on one side and the other on the opposite wall (side) but off the floor oaf possible.. No big deal for placement; what is important is infinitely variable phase, level and crossover point for each sub. I had that with my subs… So I tried that... It took me several weeks and I persisted and the bass I got from the Maggies were the best bass I have ever heard from any system …
Thus my new position which is Earl Geddes’s At least three subs positioned as described earlier … with any system even full range speakers... You will get much better bass and a sense of integration that is difficult to believe... The most interesting part is that the bass is better both subjectively (The air was being compressed in my closed, concrete room) and objectively (I was measuring the flattest I have ever without equalizer ... I had a response that was essentially flat from 14 Hz to 150 Hz with “only” 2 Sunfire True Signature and one “Junior”… I got serious output under 20 Hz, with one of the subs in corner loading … Takes a while to find proper level, frequency and phase, a long while but it DOES work and well and surprisingly well… Makes me wonder what that could have been with more serious subs, either DIY or commercial. I hasten to say that DIY is one area where the commercial offerings are surpassed routinely…
I wanted to add to this long post that when I heard Steve’s system I find it odd to pair the X-2 with a pair of subs... Well the integration is there for those who can hear and while Steve’s has adopted the symmetrical (left and Right Subs) I have no doubt that his system wouldn’t have been that kind of good with out the subs. They allowed Steve’s to place the X-2 for best staging/imaging and to have the bass needed for a world class system… I was convinced even before then but find more interesting to go toward that.
AS you can see I am a convert... Better bass possible in a system? At least 3 subs in dissymmetrical fashion, a la Geddes… A person called Melhau has a nice write-up on his experiences with three subs, much more precise than this post …
HERE