Lowther Bass Reflex and Subwoofers

Well, after reading about how difficult it is to marry a subwoofer and single driver speakers I think I now understand what all the fuss is about.

My speakers are Lowther DX2 in a Lowter America 2.5 I bass reflex cabinet. The subwoofer is a REL Strata II. A quality 300b SET interstage coupled amplifier is the power. Primary music is diverse; jazz, rock, reggae, classical, indian. Most of the mate rial is acoustic and some with very high dynamic range.

The REL is set on third position for both crossover (fine, coarse) settings which is around 60hz. The REL is driven with speaker level via the standard Neutrik connector.

I was listening to material with pretty good dynamics the other night; ie, Shakti, Roger Waters In The Flesh, Bob Marley Survival. There was just no bass impact on the bottom to speak of. When I walked over to the woofer there is all sorts of low end energy happening. Sitting in the sweet spot of the Lowthers and it just sounds kind of muddy.

The Lowthers are placed about three feet from the rear wall and one is near no side wall; the right speaker is three feet from a side wall.

My understanding is this REL is one of the better subs out there for use with "quick" speakers. Might it be that I just need to spend more time with crossover points and positioning of the Lowthers? The sub is to the left of the system; ie, about one foot to the left of the left Lowther and two feet from the rear wall.

The walls and ceiling are bare at this point as I just moved in. I am just about ready to acquire another woofer, or two, to audition. Some of the woofers I've been considering are the Magelland and the PMC. I'd like to find an older Hsu 8" passive woofer and run an active crossover but I have never seen one for sale.

Try running your subwoofer 180 degress out of phase. Also you may want to check the volume of the subwoofer with a SPL meter to see if you have it set too high.You should not be able to locate that sub in the room when it's set properly.
I've tried the phase repeatedly; makes a subtle difference but that is not the issue. Perhaps I need to rearrange my system so I can move the Lowthers closer to the rear wall to increase their bass output and then try to integrate the REL again.
I've been reading the 2.5 I has a in room response down to roughly 40 Hz.... Minus 3 or 4 dB. Your subwoofer crossover may actually be set a little too high at 60 hz. Just a thought.
With patience it will come together for you.

Good luck!
I think I found a solution and from an unlikely source. First, these speakers don't go down to 40 when they are 3' from the walls which is how they are set up as this presents the most neutral sound albeit at the expense of a bit of bass.

I'd picked up a Gallo 8" passive sub to throw into the home theatre system but the lady said NO and that was that (already one powered woofer). So, I moved it into the stereo system and ran a RCA cable from the output of the preamp in parallel with the RCA to the SET 300B amplifier into a Creek passive preamp. This then feeds a Bryston 2BLP 60wpc SS power amp; the creek provides the volume control. The Gallo has an internal passive crossover that is crossed at 120hz; I did not think it would work well at all. BUT IT DOES! The Gallo is 8 ohms and low 90s for efficiency so the Bryston works quite well with it in stereo mode running into the sub inputs.

I reset the REL Strata II to cross over at the mid 30s. So, the REL works the sub bass and now sounds fine; the Gallo works the midbass from around 35, or so, up to 120. The lowthers do the rest. The REL is set to reverse phase.

It sounds great; bass is tight and well defined. The remote controlled Creek allows the mid bass to be changed easily for each recording.