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CO wrote:

I dont need flat to 20K but dropping after 10K necesetates a tweeter.

And there is nothing wrong with it. No one 500Hz driver that said is doing to 20K in reality does it. In fact if a driver goes to 20K then the place for this driver is not in a playback system but is showrooms built specifically to impress the audio-fools and mosquitoes. A playback should acoustically up to 12.5-13kHz, no higher.

CO wrote:

I believe your using an altec 15" driver for upper bass? I couldnt really find it anywhere. You also mention the small mouth compared to traditional horn thinking. Are you using a phase plug here? The back chamber also seems very small for a large driver so you might be using something else?

Collin, I have said about it very many times on my site. When you have time spend some time to read it over. I juts do not want to go all over it again.

CO wrote:

Im wondering if i can get enough impact (at moderate levels) with upper bass using an 8" or do i really need a 10" or more?

It has nothing to do with the “enough impact”. I am saying again: do not worry about the upper bass driver but figure out what horn you will be building. THEN, the driver will derive form the horn’s design.

CO wrote:

Target lower frequency also around 100hz to still be able to cross to the subs. I said subs but yes you are very right about the "organic continuation of acoustic system". I have spent alot of time to get these up to speed with my mains.

If you want 100hz then you have the mouth size, not you need to figure out how long you would like to have it and form there you will have the throat diameter. The driver will be derive form that.

CO wrote:

I presume you also recommend a driver with shorting rings or even beter an underhung design?

Hmmm, I do not know. The shorting ring and underhunging are good but in context of upperbass horn it is really not the issues. A good driver even at 100H will not run further then a few mm not to mention the it will be severally damped, so…. The shorting ring is fine but the all have low sensitively. Will you put a 96dB sensitive driver into +6dB horn if you have 108dB coming from your MF channels? What will you do: go multiamping or burn the 6dB on a damn resistor?

Rgs,
Romy the Cat

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