New two-way ALtec horn design, questions

[GM]

You?re welcome!

Again, if using the GPA XO, then only if you use an 811 in the same location referenced to the woofer location.

I already answered this and don?t know how to explain it any simpler, so with what few details you?ve posted, I?m guessing not in your app.

Huh?! I gave you my thoughts! Guess I gave you too many, so if 240 L is as big as you can go, then do it and initially tune it to ~32 Hz and fine tune it from there if required.

GM

[atilsley]

You’re welcome!

Again, if using the GPA XO, then only if you use an 811 in the same location referenced to the woofer location.

I already answered this and don’t know how to explain it any simpler, so with what few details you’ve posted, I’m guessing not in your app.

Huh?! I gave you my thoughts! Guess I gave you too many, so if 240 L is as big as you can go, then do it and initially tune it to ~32 Hz and fine tune it from there if required.

GM

Thanks again, GM...I'm trying to keep up with your tech detail...so it's all a learning for me at the moment. I appreciate you've been in the game a long time.

As an aside, for your own system (or previous ones), do you run any subs? I ask this because I have the two small tapped horns I can use for the 20-40Hz range if needed. For me, I guess I'm working through the issue of building an Altec system that is strictly two-way (ie, no subs), or with subs. If the latter, then I don't need to tune the cab down as low, hence, not build it as big. Just talking out loud here....

Thanks again.

[atilsley]

No experience with any of the Altec/GPA adjustable XOs beyond playing with settings on some Altec consumer model speakers and not liking what I hear when any 15? is used this high with a separate horn, no desire to get any.

GM

Thanks....just to clarify your point, are you saying you do not like the sound of a 15-inch woofer approaching/exceeding 1200Hz? Does this mean you do not like the sound of the Model 19, which crosses over at this frequency?

I'm just asking as the Model 19 is something I'm trying to determine if that's the 'sound for me.'

Kind regards.

[mah]

Anybody near Sydney got a Model 19, or similar, for auditioning by Atilsley?

[GM]

Thanks....just to clarify your point, are you saying you do not like the sound of a 15-inch woofer approaching/exceeding 1200Hz? Does this mean you do not like the sound of the Model 19, which crosses over at this frequency?

No and no. Frankly, I was stunned to learn how highly regarded it is among the ?faithful?. Technically, it?s a poor ?marriage?, sonically coupling the tail end of the driver?s break-up modes to the HF horn?s compression loaded BW. The 416, and especially the 515, are better than most WRT controlling break-up modes, but????

Run the 416 full-range by itself and with various XO points/slopes and let your ears decide. Altec knew they needed to use either the 515 or a custom, but between budget constraints and the desire to keep up with the competition bass ?thump? wise????

GM

[GM]

Ok thanks. The HF's are similar for 511 and 811....given I'm aiming to cross higher, wouldn't the 811 be the default choice?

Yes, if there?s no need for the larger horn?s ?tighter? polar response and/or not in a prosound app where the bigger horn better protects the driver below the XO point.

GM

[atilsley]

No and no. Frankly, I was stunned to learn how highly regarded it is among the ‘faithful’. Technically, it’s a poor ‘marriage’, sonically coupling the tail end of the driver’s break-up modes to the HF horn’s compression loaded BW. The 416, and especially the 515, are better than most WRT controlling break-up modes, but…………

Run the 416 full-range by itself and with various XO points/slopes and let your ears decide. Altec knew they needed to use either the 515 or a custom, but between budget constraints and the desire to keep up with the competition bass ‘thump’ wise…………

GM

Understood. Why didn't Altec cross the 19 around 700Hz...given the 511's LF range? Wouldn't this have solved the criticims you raise re HF distortion of the woofer....?