New Cain & Cain IM Ben Fostex/double horn - help

I had a similar problem with my Lowther drivers in my Voigt Pipe cabinets.
The fix was to use a set of SP-004 Sistrum Platforms under them. Like magic. Boxy sound gone, smear eliminated. I've posted this numerous times in the past, and also emailed several people about it who experienced similar problems. It is even written into the Voigt Pipe construction plans that appear on the Lowther America website. I know the Double Bens are not Voigt Pipes, but I know about this problem.

Yes, I'm the Sistrum internet sales rep, and yes it really did work as I said.

As someone said earlier, try moving the speakers a little. It's cheap and you can do it immediately. I've read the worst place for a speaker is when it's placed the same distance from the side & backwall. I know you wrote 3 - 3.5 feet on one of your measurements, but sometimes even a few inches can matter, so try increasing the ratio. If you ever want to try another cable, I just got some Cardas SE-15 that Terry recommended for up to 12 feet. Great synergy with SET/single driver combos. Good luck.

You are hearing cabinet resonances.Thats why you dont hear farther back.All back horns produce these to some extent.You could cork line the horn.But as others have said ask TC .

It's a combination of your speaker location and your listening position in the BIG problem called, your ROOM. As you mentioned, when you are against the wall (at a boundry) the problem goes away. So if possible, consider re-arranging your room so your listening position is AT the rear wall.
If rearrangement is possible, also consider placing the speakers across the 24' wall. If that is doable, start with bringing each speaker 6' from the side wall to the center of the driver. That will give you 12' between the speakers.
Locate them mid-way into the room and your listening location against the rear wall. Be sure your ears are ABOVE the back of the chair/sofa you are using.
Start there and move your head forward and backward and notice the difference in the soundstage and imaging. When you find the point that sounds best, place your seat so that you are AT that point when you sit naturally.
Also, play with the toe-in on the speakers. A $20 laser level is good for proper alignment there.
Do this with the Dakron stuffing removed from the Cains.
You'll know it when you find the magic spot!
There's more you can do with cheap tweaks to the room, but this will be a good start to "work with what you've got".
Good luck and let's hear back from you with the results?

Here is an update. After reading yours post and talking to Terry at Cain & Cain this is what I have done.

1) Changed my seating position as well as speaker placement.
I am now 14 feet back from the speakers and the rear wall is 1 foot behind me with Echo Buster wall treatments on the wall. The speaker is 4.5 feet from the front wall and 3 feet from the side walls. 90% of the mid-bass/midrange colorations are gone - like magic. Combination of now being far back away from the speaker and pulling them into the room more did the trick.

2) Replaced big dollar silver/copper speaker cable with Paul Speltz anti-cable. This was the single best improvement folks. Opened up the sound and the boxy personality is gone.

3) replaced cheap PBJ IC with Tara Labs Air 1
4) replaced EH 6ns7 Wright amp tubes with RCA NOS's

I am nearing the sound of my dreams with a SET system. I have Fostex HP soud reflectors coming in today. They are made to be placed in the mouth of the upper and lower horns. Terry says this will eliminate the remaining mid-bass/midrange colorations and peaking. I am placing 2 of these 6 inch discs in each horn. I also have a Cardas Lightning digital cable coming to replace my silver/copper one. Terry says that copper is far better throughout my system with these speakers. So far everything he has said is right and thus I move on in faith!

I will let you know how these new tweaks turn out.

Thanks for all your help Agoners. I am learning that larger horn speakers can be difficult to set up. With patience they can sound so good.

My sound is big, warm, full of body and so beautiful. The music flow effortlessly and just engages the listener.I find the treble energy very good and really dont feel the need for a supertweeter. Speaker cable is very important to this aspect of the sound. The Paul Speltz anti=cable is a must for Fostex horns folks. They cost me $40 new! Ha! Beat the sound of $800 cables by a long mile.

Bill