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Thank you very much Earl, this is of great value to me!
I will check out the french forum and see if I can get in touch with Stephane :)

No problem Richard.

I think you are probably right about your assumptions wrt GPA response.. I have sent several emails about this, but sadly their reputation of never replying to emails is true.

Thank you very much Earl, this is good info :)

Isn't that kit supposed to be for all 515G models? I think I have seen the number 35400 mentioned before..
I have never come across the number...

Richard,

regardless of whether new and different versions vs Altec originals, they should nonetheless conform to the published T/S specs (by GPA) don't you agree?
I have not referred to any...

Hi Richard,

yes the drivers have been used since 2015. However parameters will never shift this much with break in, in my experience maybe max 10%. Almost 100% is ridiculous.
These were measured...

Hi,

I recently aquired a pair of GPA 515-16G woofers.
They measure close between the two, but wildly different compared to factory T/S specs..
These are labeled on the back as "horn...

Hi Rob,

can you please share the p/n's for this new generation of PT waveguides, and where to get them?
Looking at the link Ivica posted, this is an older version of the VTX F12 waveguide?
I...

Hi Barry,

thank you very much for your reply.
Those are some fabulous speakers you've got, the leviathan's must be close to the ultimate midbass horns!
I've been searching for the BRH90 for...

Hi Ivica,

sorry for my late response. It seems I'm not getting an email notification of new posts even if I checked this option in settings..

I'm not sure that lobing can be corrected for by...

Hi Rob,

yes I did, please see post #5
I'm not worried about lobing between the two woofers, but the lower woofer/midrange horn will be a problem.

Thanks for the references Richard!

Would be interesting to know why they call this a phasing plug though..

Not much response wrt the dual driver midbass horns and lobing issues :dont-know:

Thanks for the link Rob,
however as mentioned I am more concerned with the response in relation to the midrange horn one would use above this sub.
I don't think lobing will be an isssue with this...

Hi Richard,

thank you very much for your elaborate response, very much appreciated!

I'm not too concerned with lobing between the the two midbass drivers, as I think they are generally spaced...

Hi,

I'm curious to know if anyone has experienced any lobing issues with dual driver midbass horns like Altec 817 or JBL 4550, in relation to the midrange horn they cross over to.

I see lots of...

Hi Bonzo, thats very interesting! Did you like what you heard from this combination? Were they 15 cell horns?
The 950 has a very short throat, so I would think they are more optimal for use with a...

Hi Bonzo, thank you very much for your reply!

I have in fact been in contact with Markus, and he suggested 150mm length for the 2" adapter because there seems to be information from someone that...

Greetings from Norway, I'm a new user on this great forum!

I have done lots of reading on this forum for the past 15 years, finally it's time for me to make a post :)
I know there are lots of...