When choosing drivers i'd rather look at ones with a smooth roll off to make crossover design easier. Has anyone got any recommendations for woofers and tweeters that have a smooth roll off?
The 8" Vifa M21WG-09-08 rolls off pretty smoothly. The one used in the Gale gold monitor rolls off smoothly and I think it may be the Peerless SKO130 (new old stock can be found on ebay). The Seas A26RE4 also has a smooth roll off.
Can anyone think of any more?
The 8" Vifa M21WG-09-08 rolls off pretty smoothly. The one used in the Gale gold monitor rolls off smoothly and I think it may be the Peerless SKO130 (new old stock can be found on ebay). The Seas A26RE4 also has a smooth roll off.
Can anyone think of any more?
SS drivers. Check out the "Intimates" mini-monitors at the link below for specific driver models. Also note the simple crossover I was able to use because of the smooth roll offs.
Introducing the "INTIMATES" (high WAF & quality sound)
Introducing the "INTIMATES" (high WAF & quality sound)
This is the woofer used in the Intimates. A 3.0 mH series coil 1st order elect. slope tames that little bit of peaking above 2 kHz. It can go low to 40 hz in a vented 1/2 cu. ft. box.
The Madisound Speaker Store
The Madisound Speaker Store
This depends quite a lot on the baffle it's used with, no? 
Beyond the problem of the baffle, you'll also need to factor-in dispersion character when transitioning from the woofer to the tweeter. Basically most drivers will exhibit some form of "suck-out" off-axis (both horizontally and vertically - but more importantly horizontally), and getting a smooth freq. transition off-axis can be extremely difficult between the tweeter and the woofer.
Beyond the problem of the baffle, you'll also need to factor-in dispersion character when transitioning from the woofer to the tweeter. Basically most drivers will exhibit some form of "suck-out" off-axis (both horizontally and vertically - but more importantly horizontally), and getting a smooth freq. transition off-axis can be extremely difficult between the tweeter and the woofer.
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This depends quite a lot on the baffle it's used with, no?
Beyond the problem of the baffle, you'll also need to factor-in dispersion character when transitioning from the woofer to the tweeter. Basically most drivers will exhibit some form of "suck-out" off-axis, and getting a smooth freq. transition off-axis can be extremely difficult between the tweeter and the woofer.
If you're referring to the SS in the Intimates, I refer you to my techtalk forum link in earlier post #3. Examine the on and off axis response tests. Not too shabby IMO. Can't find any 'suck-out'.
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Nope. Just a general statement to fatmarley.
Often when people ask for an "easy" woofer that rolls off smoothly, what they are really asking for is a driver that has a 1st order low-pass nature on-axis so that they don't need to have a low-pass network. Of course, what they often forget is that measurements for those drivers are on an infinite baffle AND that they are often only considering the on-axis response.
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Tempting! and not too expensive either. Also works well in a sealed box which is a plus point for me.
A bit too expensive for me at the moment, but I like the simple crossover design (i'm using a modified AR-XO currently) and the woofers are happy to be in a sealed box. Maybe one day...
Nope. Just a general statement to fatmarley.
Often when people ask for an "easy" woofer that rolls off smoothly, what they are really asking for is a driver that has a 1st order low-pass nature on-axis so that they don't need to have a low-pass network. Of course, what they often forget is that measurements for those drivers are on an infinite baffle AND that they are often only considering the on-axis response.
I don't mind using a low-pass network. I'd just like it to be as simple as possible.
My current speakers have a dip at the crossover point off-axis and the tweeter slope is a bit shallow, but they sound very good to my ears. I really need to get my **** into gear and try another crossover I modeled to see if a technically better crossover sounds better.
Consider a waveguide solution for the top-end (..tweeter, not compression driver). That way you should be able to match dispersion better and have a simpler electrical high-pass for the tweeter with much lower excursion and non-linear distortion. (..it also aids in offset for the tweeter for better alignment.) Look to the January 24 & February 5 2010 posting on Zaph's blog (near the bottom of the page):
Zaph|Audio
Combining something similar with the Seas 10" (A26RE) on a wide baffle should be nice.
This speaker utilizes a variant of the A26RE:
http://www.stereophile.com/content/devore-fidelity-orangutan-o96-loudspeaker
You would need a wider baffle howeer (..and of course the waveguide loaded tweeter is insufficient in it's loading on that design). In fact you can see the suck-out horizontally centered on 2 kHz (in Fig. 4):
http://www.stereophile.com/content/devore-fidelity-orangutan-o96-loudspeaker-measurements
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Here is another classic:
The Madisound Speaker Store
It also has better dispersion out to 2 kHz then most 8" drivers..
The smaller (less than 8" driver) "Discovery" series from Scan Speak has some pretty smooth drivers (..which can also be seen in Zaph's blog).
The Madisound Speaker Store
It also has better dispersion out to 2 kHz then most 8" drivers..
The smaller (less than 8" driver) "Discovery" series from Scan Speak has some pretty smooth drivers (..which can also be seen in Zaph's blog).
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Here is 6.5" with a smooth roll-off and a bit of acoustic baffle-step compensation built-in:
M165X Woofer
Zaph also has this driver measured in the 6" driver grouping on his main page.
M165X Woofer
Zaph also has this driver measured in the 6" driver grouping on his main page.
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I actually use a waveguide in my current speakers (Monacor DT300).
Thanks for all the driver suggestions Scott. I quite like the look of the M165X.
Hi,
If you don't mind a smaller 5.5" mid-woofer that also have a nice bass extension, here's the smoothest mid-woofer I've measured.
ScanSpeak 15W/4531G00 Measurements!
/Göran
Have you measured the 15W/8530K 01? I did close mic'd (red line). See below.
Attachments
Posted measurement shows artifact in pre peak response in IR results consistent with feedback or multiple time bases (two sound cards with different clock speeds).
Peaking around 70Hz indicates we aren't looking at natural response of driver.
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