[emailtim]

Very interesting design.  What is this minimalist approach called ?

Also, how are the sub drivers wired (in phase or out of phase with each other, bipole/dipole) ?

Some nice stuff on here!

Following on from my last post (Pg.10 #263) my OB's have evolved now to a metal scaffold design. I want simplicity and no woodwork.

The scaffold is cut to size by the supplier.....I just need to assemble. The Faital arrays are hung by cable, as are the woofers (UM18), so complete isolation.

For sure, this is not the most efficient way to do bass, especially since I enjoy listening at concert levels and want to feel the bass with Kraftwerk....but its fast, clean, deep, and best of all, no room modes! They are driven by a pair of NX6000D's which also handle the crossover (275hz) to the full range Faitals (2 x 4FE32 + 4 x 3FE22)....and no....no comb filter effects!

[AJinFLA]

crossover (275hz) to the full range Faitals (2 x 4FE32 + 4 x 3FE22)....and no....no comb filter effects!

Very cool. Love the "center" CH. 
Don't see a TV (maybe hidden drop down screen?), do you listen to music in MCH?
Also curious why the 2x3+2x4+2x3 Faitals? No shading, straight signal?

cheers,

AJ

[k9vap]

Hi AJ

Yah.....TV on top but cropped. I listen mainly stereo, but have MCH facility.

I purchased 8 x 3's & 8 x 4's to experiment with. I preferred the highs of the 3's, but the fullness of the 4's....so tried a few combinations.
The current one I like best! Signal is straight, but high passed from 200hz.

Cheers

[jonasz]

K9vap, nice system!
Can you explain how you wired up the basses?

[k9vap]

Sure.....hopefully self-explanatory from the pic:

[emailtim]

Sure.....hopefully self-explanatory from the pic:

How did you electronically wire them up (in or out of phase with each other) ???

[k9vap]

Sorry 

Just reverse polarity on one of the woofers.......push/pull arrangement.

[emailtim]

Sorry 

Just reverse polarity on one of the woofers.......push/pull arrangement.

Thanks.

[Russell Dawkins]

This is a confuration I've never been able to wrap my head around.

It seems to me that two cones moving in the same direction like this would hardly move more air than a single cone and would offer little advantage over a single cone, compared to the same two cones laterally displaced (i.e., side by side), whether forward or rearward aimed. It would seem that the acoustic output of two drivers like that would be more or less the same as one with the same input power and the only advantage I can see would be greater power handling in terms of voice coil heating, but now excursion limited, just like a single driver. Could you explain what you see as the advantage?

[k9vap]

Seems like its a directivity advantage.... see this thread:

https://www.diyaudio.com/forums/multi-way/46111-legacy-whisper-bass.html#post3897099



I have tried many bass configurations with various baffle arrangements. The single cone monopole arrangement fires bass everywhere,
bouncing off the walls creating huge artifacts. There is a 3db increase in SPL using this way as opposed to a 6db increase facing the same way.
But at the end of the day,  bass is all about integrating with the room.
In my room, this compound dipole arrangement works fantastically well, and certainly gives me the best, most even bass I ever had.

[Openly Baffled]

Work in progress...

5th, 7th and 8th generation OB's ready to face off in some indoor measurement and A/B/C testing - I need a bigger room!

[calsaint]

Changed things up a bit recently.





1. Out go the DX3s, in go the Visaton B200s
the DX3s I could only get to sound great with the 2a3 amps I tore down and parted out. I'm waiting for phase plugs. Getting used to these as is for a bit.
2. Out goes the diy 2a3s, in goes the Dennis Had Inspire PSE.
I like diy a lot, but I felt like I needed a dose of commercial at least for now for level setting.

Ashly xo, Bottlehead SEX doing pre/head amp duties, ClassD for the 15as

The second pick of the rack and surroundings has a lot of stuff in it that I thought the group would get a kick out of for its messiness and for the used and unused gear.

The back of the room (not pictured) has a mess of other things too, Klipsch Heresy Is, more amps and dacs, etc. Some time in the near future I'll need to get my a/d/s 810s back from a buddy and hook them up to this amp. I bet they'd sound really good (but not OB !).

-Steve

[Poultrygeist]

Needed some tunes in the garage but I also put these OB together so I could sell the Marantz 1150 integrated on CL. In these difficult times I don't want strangers coming into my house for auditions. The full range drivers are Realistic 40-1286c over plate amp driven Eminence Alphas. The tweeters are B&G Neo 3 planars with their back covers removed.





 

[dhadland]

 

[dhadland]

Still breaking in, in the bedroom!
 

[M66chevelle]

[joessportster]

[bladesmith]

Still breaking in, in the bedroom!
 

What drivers are you using in your setup..?
 

[Poultrygeist]

Since I now have the Lowther DX3's in MJK's MLTL cabinets I found drivers to replace them. They are 8 inch Zenith alnico's pulled from a 1957 console. Same console that the 49CZ802's came from. Wish I knew the model number but all markings were blacked out at the factory. They are exceptional just like their big brother 49CZ's. Bi-amping with class d amps and crossing over with an Ashly active.

[Poultrygeist]

The 8 inch Zenith alnico's sound like large Coral Holey Baskets. Except for the cone they look much the same.