Lowther dipole 2way

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#41
DualTriode said:
Hello trusound,
Your art is impressive.
I have some form follows curiosity.
Last October I went to Burning Amp and listened to Nelson Pass’ demonstration of Lowther open baffle dipole speakers. The OB panels were nearly the width of a sheet of plywood. The lowther’s were in a two way with some 15 woofers.
My understanding is that OB mounted speakers roll off at 6db per octave and the frequency where they begin rolling off is calculated using the wavelength divided by the width of the baffle (the exact formula is not in my hand). Looking at your baffle my assumption is even with equalization you must be crossing over the Lowthers at a relatively high frequency.
Would you mind sharing some of the equalization and crossover details of your creation?
DT
All just for fun!
Click to expand...

Hey my friend..

My personal opinions and taste gravitate me away from large baffles in any type of design I build.. Sure the extension and baffle step issues change dramatically with baffle size. But to me they just sound like 1 large radiating surface and do little for disappearing during playback.

I first noticed this this at a good friend on mine's rig.. His Lowther's are OB on a baffle designed to have strong response past 200ish.. And with all the box coloration gone, the one thing I noticed is that I was hearing the baffle..

So an experiment was done placing a Lowther on a mic stand just for a good laugh, but nobody was laughing once it started to play..

This application has the Lowther at 330hz at 6db and rolls off dramatically after that .. I'll have them actively processed and are made to be bi-amped.. that way a tube or low powered class A can power the lowthers and a much stronger AB or D can power the dyns with 0 compromise

I'll have some readings up soon for these once finished
 
#42
Hey trusound I’ll be your friend,
I saw the dual cable connections on your Lowther dipole 2ways and assumed dual amp and active crossovers. I am in the process of building Linkwitz (Phoenix) style dipoles with Vifa drivers. I will be using a Behringer Real Time Analyzer and DCX2496 speaker crossover to select crossover points, slopes, equalization and the like. The Phoenix style dipoles are not nearly as large as some of the OB’s I have seen. After a little trial and error tweaking with the digital tools and baffle size adjustments the plan is active discrete filter circuits.
Thank you for sharinging your work and thoughts.
DT
All just for fun!
 
#43
I have been working on another project these past few days... Still allot to do as I still have to paint the trim and baseboards, order my 10 x 10 rug from CB2, Chair from CB2, and acoustic treatments and diffusers need to be installed..

But it's coming along nicely

p96.jpg


p94.jpg


p93.jpg
 
#44
This is a phenomenal looking speaker Randy!

I agree with your impressions of a large baffle. The speakers fail to do the disappearing act.
But I've heard a no baffle speaker also, similar to yours. It needed lots of EQ below about
500 Hz. I'm guessing you'll need some too.

The rising response of the Lowthers is typically controlled with a backloaded horn to raise
the efficiency of the lower midrange and bass. With the no baffle, or even a open baffle,
the bass rolls off even faster and it needs even more EQ to get a flat response.

Like you say, it may sound much better than it looks, as is the case with the good full range
hi-eff drivers.

Good luck and keep us posted.
 
#45
ra7 said:
This is a phenomenal looking speaker Randy!

I agree with your impressions of a large baffle. The speakers fail to do the disappearing act.
But I've heard a no baffle speaker also, similar to yours. It needed lots of EQ below about
500 Hz. I'm guessing you'll need some too.

The rising response of the Lowthers is typically controlled with a backloaded horn to raise
the efficiency of the lower midrange and bass. With the no baffle, or even a open baffle,
the bass rolls off even faster and it needs even more EQ to get a flat response.

Like you say, it may sound much better than it looks, as is the case with the good full range
hi-eff drivers.

Good luck and keep us posted.
Click to expand...

Thanks for the compliments..

These guys have a very strong response well into the 300's but then fall flat on their face.. but that's what the Dyn's are for.. the only very minor issue I have with this application is some lobbing but that's it.. Everything gained from this outweighs that small issue by a 1000x's..

Once EnAbled, I feel these will take a leap to what I feel is a benchmark platform.. all of which is my opinion 😀
 
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