Crossing an 8" at 1600kHz

[Godzilla]

Can an 8" be crossed successfully at 1600kHz to a compression tweeter? I was going to use a 10" but think an 8" will work better in the box (42L) I'd like to use. Is there a sonic reason to cross higher? I wanted to cross the horn as low as possible.

Thanks in advance!

 

[picowallspeaker]

Is there a sonic reason to cross higher? I wanted to cross the horn as low as possible.

Pistonic range for the woofer
Geometrical tightness for the tweeter, for a CD the horn does the function

 

[norman bates]

Don't see why not, 2k even.

 

[JMFahey]

Default Crossing an 8" at 1600kHz
Can an 8" be crossed successfully at 1600kHz

No, but you can make a nice broadcast band AM transmitter at that frequency.

 

[Tromperie]

Crossing an 8" at 1600Hz

Yes, I made a pair that crossed at 2 or 2.2kHz, can't remember exactly and they were alright.

No, but you can make a nice broadcast band AM transmitter at that frequency.

lol

 

[picowallspeaker]

Crossing in that delicate area requires more and much information, other than practice & experiment.
A CD in a horn ( what else ? ) would meet different requirements, such long-throw PA or heavy SE 1/2 W triode at home, and would be better mated to a 6 " midrange ( big magnet )

 

[GM]

Can an 8" be crossed successfully at 1600kHz to a compression tweeter?

As picowallspeaker noted, for best overall performance it depends on the tweeter's specs.

GM

 

[hristow]

I always avoid a crossover between 500-3000. The ear is the most sensitive there.

 

[eriksquires]

In addition, assuming you actually meant 1.6kHz and not 1600 kHz, 8" speakers are getting pretty directional. There are a number of good pro/commercial drivers that could play at the range, but matching directivity with your tweet will be important.

 

[hristow]

You can also use an electronic cross with 18 or 24db per octave and amp for every driver.

 

[badman]

A good 8" can readily do that for you, and it makes the compression driver/horn solution a whole lot easier (it's a stretch to run many of these CD horns at 1khz). If you wanted to go with a highly directional system, the selenium hm17-25 is a great sounding inexpensive 60x40 option that's very comfortable with a 2-2.2khz XO.

 

[Godzilla]

Thanks everyone! Below are the components I plan to use - pretty conventional but I think it will do the trick in the 42L box I have. I am certain the crossover will need adjusting with an L-pad and some additional caps. I've had great results with this tweeter/horn combination crossed to a 10" on an open baffle and I am hoping to get similar sound.

I think the crossover will work fine but wanted to know if crossing this low might create other issues. Typically I see 8" systems crossing above 2kHz. I come from a full-range driver background and hope to avoid any foolish mistakes.

Pyle PDS442 compression driver:
https://www.parts-express.com/pyle-pds442-1-titanium-horn-driver-1-3-8-18-tpi--292-2510

Selenium aluminum horn:
https://www.parts-express.com/selenium-hm25-25-1-exponential-horn-90x60-1-3-8-18-tpi--264-312

Dayton Audio 8" pro woofer:
https://www.parts-express.com/dayton-audio-pa200-8-8-pro-woofer-speaker--295-025

Eminence pre-assembled crossover:
https://www.parts-express.com/eminence-pxb2-1k6-2-way-speaker-crossover-board-1600-hz--290-634

 

[GM]

At a glance, the 8" response is near enough 'setting' on the baffle at ~160 deg [180 deg in theory]/1600 Hz whereas the horn is around 45 deg/horizontal, so has an off axis response similar to a alum. dome 'FR' driver, requiring running the horn 'hot' with a HF bypass cap and listening off axis like with a Lowther or similar.

GM

 

[Gnobuddy]

No, but you can make a nice broadcast band AM transmitter at that frequency.

I don't think anybody else noticed the misplaced SI prefix. Or they were too polite to mention it.

-Gnobuddy

 

[Gnobuddy]

Pyle PDS442 compression driver:
https://www.parts-express.com/pyle-pds442-1-titanium-horn-driver-1-3-8-18-tpi--292-2510

Selenium aluminum horn:
https://www.parts-express.com/selenium-hm25-25-1-exponential-horn-90x60-1-3-8-18-tpi--264-312

Is this for P.A. use? There are some nasty peaks and dips in the frequency response of that horn. 1.5kHz is 10 dB higher than 7 kHz.

-Gnobuddy

 

[Bigun]

I always avoid a crossover between 500-3000. The ear is the most sensitive there.

Why is it bad ?

 

[Michael Chua]

I don't think the Pyle 442 and the Selenium 25-25 are suitable.

If you can spend more, use a FaitalPro STH100 and a Selenium D220ti. You can get a beautiful response down to 1.5kHz.

I tested out this combo with a Dayton RS180S. Click HERE for details.

Regards
Mike

 

[freddi]

Eminence's 1K6 xover parts values: Lowpass = 1.18/10uF - -Highpass 8uF~0.28mH- 22uF (I only measured the two unmarked inductors - all caps are labeled) - someone good with a simulator could see how this generic network blends with components of interest.

fwiw I'd trust an ASD1001 more than a Pyle. Hwathorne ran ASD1001 low in their original Silver Iris 15cx

how about "this" PRV waveguide? - its like a 1/4" thick or more casting

https://www.parts-express.com/prv-a...iptical-tractrix-waveguide-2-3-bolt--294-2890

42l is pretty big

 

[Godzilla]

Thanks everyone. I will try a few different horns. I'm just trying to decide on a crossover - either 1600 or 2000. I'll keep you posted.

 

[adason]

Can an 8" be crossed successfully at 1600kHz to a compression tweeter? I was going to use a 10" but think an 8" will work better in the box (42L) I'd like to use. Is there a sonic reason to cross higher? I wanted to cross the horn as low as possible.

Thanks in advance!

beaming