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Old 3rd May 2016, 01:53 AM   #1
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Default Using full range with natural rolloff to avoid warble tone?

If you use a fullrange, and you want to listen to complicated rock, etc...

How low must you rolloff the lower frequencies in order to avoid compictaions from warble tone? The Alpair 5 looks nice because ported it naturally falls pretty steep at 100hz... I'd probably use 4X of them to achieve efficiency for crest factor, and even consider a tweeter. What I'd like to avoid is a capacitor inline with them. Tweeter probably wouldn't cross until well after 3khz.

This is just an idea I've been playing with, but I'm new to speaker design.
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Old 3rd May 2016, 02:23 AM   #2
zman01 is offline zman01  Bangladesh
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Quote:
Originally Posted by Destroyer OS. View Post
I'd probably use 4X of them to achieve efficiency for crest factor
You might get some combing effect.

If you are thinking of adding a tweeter and a woofer to augment LF and HF, then it becomes pretty much a multi-way speaker.
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Old 3rd May 2016, 02:26 AM   #3
chrisb is offline chrisb  Canada
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If you're talking about the most recent version - A5.2, I've heard them and would opine that a tweeter might be redundant- in fact they'd be on my short list if drivers to use as top end in a FAST.

What exactly do you mean by warble tone?
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Old 3rd May 2016, 04:48 AM   #4
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I want to avoid combing... that's why I thought a tweeter might be the ticket.

The idea is to keep the 300-3000hz sweet spot.

Bob Brines talks about warble tone problem on his website.

The problem with the driver is it's just about useless by itself. At the efficiency it has, and it can only take 15w, it's nearly impossible to get good crest factor. And it won't do bass frequencies. Forgoing the tweeter is fine, I just was worried the distance between drivers would be too great for the much higher frequencies and it would do combing (and hopefully be close enough to avoid it for the range they play).

Last edited by Destroyer OS; 3rd May 2016 at 04:50 AM.
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Old 3rd May 2016, 06:59 AM   #5
zman01 is offline zman01  Bangladesh
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Destroyer OS,

Maybe it will be better to go for a design that will meet your objectives of building the speaker. If a particular wide-band driver or wide-band units as a category do not satisfy your goals (like testing your amplifier), trying to fit them into certain usage models will create additional complexities.
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Old 3rd May 2016, 07:35 AM   #6
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My objective is 3-3 with no series capacitor, crest factor above 100db at listening position, and very very good quality of sound.....

The problem with that is I don't like the sound of say Fostex FE126en so much... There's not a lot of fullrange driver units that can achieve an acceptable crest factor. Very few, mostly Fostex that aren't really what I want.

4x 5.2's seems pretty darn ideal. 60w power handling, crest factor above 100db at listening position, high efficiency for easy amplifier pairing. They easily can do 3-3. And the quality may be outstanding.

What I don't know is how high the frequency must be to avoid warble, or how low it must be to eliminate significant comb filter. (I know some guys want a truncated version of the MA's face so they can get cones closer)

If warble isn't a concern below 100hz, I'm set. Then I just need to know how bad comb filter is running no tweeter, and how bad it is at just above 3khz so I can use a tweeter.

Last edited by Destroyer OS; 3rd May 2016 at 07:39 AM.
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Old 3rd May 2016, 01:02 PM   #7
xrk971 is offline xrk971  United States
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Alpairs are quite power limited and don't like to get hit with high power peaks. Maybe you can look into pro audio single mid/full range that can generate higher SPL and handle power with a single driver. Avoids warble or comb filter effects of multiple drivers.

Check out PRV 5MR450-NDY. 95dB sensitive and handles 225w with 275Hz high pass filter. Works up to 15kHz so low passing at 4kHz is no problem to cross over to a tweeter. It's a very low distortion nice sounding driver.

I have not used it but Galaxy 5in full range with Nd motor also looks like it is worth a try.

Faital Pro 3FE22 or 4FE32 also high sensitivity and smooth sound.

Last edited by xrk971; 3rd May 2016 at 01:05 PM.
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Old 3rd May 2016, 06:32 PM   #8
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But do they have the finesse? The PRV FR shows promise for a naturally roll off. However I'd have to find one without the name on the cone.

My original questions remain.

Last edited by Destroyer OS; 3rd May 2016 at 06:36 PM.
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Old 3rd May 2016, 08:18 PM   #9
chrisb is offline chrisb  Canada
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The A5.2 is definitely not for you then, and xrk is probably on the right track in recommending pro-grade drivers.
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Old 3rd May 2016, 08:39 PM   #10
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Avoid multiple drivers. They almost never sound "right". The Galaxy is worth a try, as is the PRV, but both will need a bit of work for finesse. Except if you want to try a Bessel array ...
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