chaos wrote:

romy, you said, you would place a 60hz midbass on the side, is this still your opinion? of, course i found no other solution in my small room.

Klaus, there is a rule that I developed – I have no explanation for it but I obey it: any lower frequencies shell not be radiated from the space between higher frequencies.

chaos wrote:

spherical 50hz...would like to do it, a "no prisoners" solution;-)))

The spherical if not is not the case. The 50hz is "no prisoners" solution… but ONLY if it done properly. Badly designed and implemented 50Hz horn harms up more then helps.

Wojtek wrote:

...AH425 is a new horn in developement for Lynn Olson new speaker (I heard ) to match GPA 288 driver…

BTW, I have to say that I did read that Lynn Olson’s thread a few times; I think it call “Beyond Areal”. I would not vest too much into Lynn Olson’s development. I do not exactly what he does (besides entreating the DIYaudio folks) but many and many things in that thread are too bogus to take it seriously and  read one-two posts per month and never able to finish reading the posts – too absurd and too extraneous… Their methods, their judgments and their references are just too much irrelevant for the sake of Sound. Whatever the Beyond Areal will turn into, I am sure will be the very same boring Areal. It is not to mention that no one from that thread actually does the things in horns (except one guy who is persona non grata on my site) – they just run mouths on any subject, nothing else.

I use regular Lowther DX4 (ENABLED) . I don't think the 250-400 is stellar and  I'm still waiting for the extension to try small throat for lower midrange (2,75") (B&C 8P21E driver) for 200-1000Hz . Here is Martin's opinion on the subject.

>I made the 204 extensions to 2.75" throat for a 6ND410 (18sound) 6"
driver
>for mid bass - I thought it worked OK, it measured OK - until I compared it
>to Lowther on 204 8" throat horn - same limited bandwidth set with a 24dB
>cross over.  The Lowther was just way ahead on sound quality - deaf man
>would have heard it.  So I gave up on that idea.

We'll see. Regards, W

Wojtek wrote:

I use regular Lowther DX4 (ENABLED) . I don't think the 250-400 is stellar and  I'm still waiting for the extension to try small throat for lower midrange (2,75") (B&C 8P21E driver) for 200-1000Hz .

mumford wrote:

As we are discussing Lynn Olson's new speaker, here is what it appears to have so far.  Raal tweeters 5000hz and above Altec 288-16H with Azurahorn 1000 hz to 5000 hz subwoofer below 80 hz Unknown (possibly open baffle) from 80 hz to 1000 hz