Drivers with a smooth roll off? - diyAudio
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Old 11th January 2013, 12:26 PM   #1
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Default Drivers with a smooth roll off?

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?
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Old 11th January 2013, 08:45 PM   #2
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SEAS CA18RLY - bit of a peak on the FR graph, but a 1st order xover smooths it out nicely
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 11th January 2013, 10:38 PM   #3
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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)
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Old 11th January 2013, 10:56 PM   #4
ODougbo is offline ODougbo  United States
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This is a very popular woofer, may be what you are looking for.


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Old 11th January 2013, 11:02 PM   #5
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the ER18RNX needs a filter to deal with the high end peak or a high level of BSC, so I wouldn't say it had a smooth enough roll off...
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Old 11th January 2013, 11:13 PM   #6
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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.

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Old 11th January 2013, 11:17 PM   #7
ScottG is offline ScottG  United States
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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 (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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Old 11th January 2013, 11:23 PM   #8
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Quote:
Originally Posted by ScottG View Post
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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Old 11th January 2013, 11:26 PM   #9
ScottG is offline ScottG  United States
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Quote:
Originally Posted by speakerdoctor View Post
If you're referring to the SS in the Intimates, I refer you to my techtalk forum link in an earlier post. Examine the on and off axis response tests. Not too shabby IMO. Can't find any 'suck-out'.
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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Last edited by ScottG; 11th January 2013 at 11:32 PM.
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Old 12th January 2013, 12:14 AM   #10
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Originally Posted by PeteMcK View Post
SEAS CA18RLY - bit of a peak on the FR graph, but a 1st order xover smooths it out nicely
Tempting! and not too expensive either. Also works well in a sealed box which is a plus point for me.
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