Curvy Chang thread - Page 4

OzMikeH · 18th August 2007, 05:07 AM

Funny you should mention that...
I was wondering how to assist the extreme bottom end with an integrated (sub?) woofer.

Add three inches to the height, then use the void in the bottom for 12 inch driver. the volume would be close to 30 litres, need to design in conjunction with driver selection of course.

about 100Hz Xover.
This might make a real mess of the coherence of the bass. Please let me know if it's a dumb idea.

Scottmoose · 18th August 2007, 09:05 AM

Ron & GM are the experts on this sort of thing -guys? FWIW, I'd probably be a bit wary, although as our hearing in the extreme lows is ~rotten anyway it's probably not going to cause as many problems as it might do higher up the FR.

GM · 18th August 2007, 11:55 AM

Greets!

It's not a dumb idea per se, it's been done by a number of boutique horn manufacturers in recent years with the advent of relatively cheap electronics, though as a bi or quad-pole layout to get efficiency up while keeping construction simple/light without enough vibration to excite the horn's modes. The XO point needs to be low/steep though to blend with a proper horn's ~24 dB/octave final roll off as well as keep it out of our acute hearing BW and why it will work better with a typical BVR than the slower rolling off BLHs designed to hopefully mate well enough with the room's gain curve. In the days of passive XOs, the 'sub' was instead typically a BP to keep the XO simple/cheap, though it was huge due to the drivers of the day having a very high Vas by today's standards.

GM

planet10 · 18th August 2007, 06:56 PM

This idea is very similar in concept to the Stealth Woofers for the Frugel-Horn. If you can find a woofer (8 or 10 or 12) that fits into 30 litres and gives reasonable/worthwhile extension do let me know. The Extremis fit into 22 litres (things are looking good for a replacement soon), but i'd really like to find a woofer where i could fit a pair in push-push in a similar volume (i can actually spare 28 litres for the FonkenWoof)

dave

hwong · 18th August 2007, 10:28 PM

Will the AN8 works in the Curvey Chang?

OzMikeH · 21st August 2007, 12:35 PM

To those who are experienced with the FE207E:

Has anyone measured the frequency response of a phase plugged one around 10-15kHz?
I ask because about to order some parts for some line level XOs.

The Chang's calculated response looks great all the way to 40Hz, This seems too good to be true. What does excursion look like below 100Hz?
I ask this because I may as well get the parts for the low end if I tri-amp with a helper sub later on.

Scottmoose · 21st August 2007, 01:57 PM

It's not too good to be true -it's just an 1/2 space FR graph. What the room will do to it is another matter of course, as with any 1/2 space plot.

Total excursion should be something like this:

OzMikeH · 21st August 2007, 10:42 PM

No sub needed then. Very, very impressive.
If Chang ever gets a woofer pal like Calhoun it's going to be huge. (I won't need one)

planet10 · 22nd August 2007, 12:16 AM

Quote:

Originally posted by OzMikeH
If Chang ever gets a woofer pal like Calhoun it's going to be huge. (I won't need one)

If you like those 16 Hz peddles -- a pr of ShadowSD12 should take the bottom down well below 20. And with authority.

If you want huge then double the width and have a pair of push-push SD12.

http://p10hifi.net/planet10/CSS/CSS-...ction-data.pdf

Make a nice 3-way system. Active at 50-60 Hz.

dave

planet10 · 22nd August 2007, 12:17 AM

ShadowSD12 (same size as shadow, but 10" internal widrh)

18th August 2007, 11:55 AM	#33
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! It's not a dumb idea per se, it's been done by a number of boutique horn manufacturers in recent years with the advent of relatively cheap electronics, though as a bi or quad-pole layout to get efficiency up while keeping construction simple/light without enough vibration to excite the horn's modes. The XO point needs to be low/steep though to blend with a proper horn's ~24 dB/octave final roll off as well as keep it out of our acute hearing BW and why it will work better with a typical BVR than the slower rolling off BLHs designed to hopefully mate well enough with the room's gain curve. In the days of passive XOs, the 'sub' was instead typically a BP to keep the XO simple/cheap, though it was huge due to the drivers of the day having a very high Vas by today's standards. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

18th August 2007, 06:56 PM	#34
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	This idea is very similar in concept to the Stealth Woofers for the Frugel-Horn. If you can find a woofer (8 or 10 or 12) that fits into 30 litres and gives reasonable/worthwhile extension do let me know. The Extremis fit into 22 litres (things are looking good for a replacement soon), but i'd really like to find a woofer where i could fit a pair in push-push in a similar volume (i can actually spare 28 litres for the FonkenWoof) dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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18th August 2007, 09:05 AM	#32
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Ron & GM are the experts on this sort of thing -guys? FWIW, I'd probably be a bit wary, although as our hearing in the extreme lows is ~rotten anyway it's probably not going to cause as many problems as it might do higher up the FR.

18th August 2007, 10:28 PM	#35
hwong diyAudio Member Join Date: Oct 2006	Will the AN8 works in the Curvey Chang?

21st August 2007, 12:35 PM	#36
OzMikeH diyAudio Member Join Date: Mar 2007	To those who are experienced with the FE207E: Has anyone measured the frequency response of a phase plugged one around 10-15kHz? I ask because about to order some parts for some line level XOs. The Chang's calculated response looks great all the way to 40Hz, This seems too good to be true. What does excursion look like below 100Hz? I ask this because I may as well get the parts for the low end if I tri-amp with a helper sub later on.

21st August 2007, 10:42 PM	#38
OzMikeH diyAudio Member Join Date: Mar 2007	No sub needed then. Very, very impressive. If Chang ever gets a woofer pal like Calhoun it's going to be huge. (I won't need one)