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Old 16th July 2013, 01:36 PM   #1
Philfr is offline Philfr  France
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Default FF165WK as woofer

Hi,
What do you say about this idea of using FF165WK (or FF225WK ) as woofer ?
Regarding Mms 9,5 gr and Le 0,056 mH ..
The result depends on design, but paper and low Mms go together.
Thank's for ideas.
Phil.
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Old 16th July 2013, 01:39 PM   #2
xrk971 is offline xrk971  United States
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What upper freq cutoff are you considering? There are plenty of much more cost effective woofer-only drivers if that is your need as it is a waste to use a wide band driver only as a woofer.
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Old 16th July 2013, 01:47 PM   #3
IG81 is offline IG81  Canada
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I would not buy them to use them as such, not to say they could not do a fair job within their own limits. I do own a pair of FF225WK and have crossed-them over to various tweeters anywhere from 1.5kHz to 15kHz, but they have been ran as fullrange with helper tweeters the majority of the time. If either the 165 or 225 has to have a low-pass filter, I'd at least suggest going active for best results IMO.

IG
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Old 16th July 2013, 02:07 PM   #4
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Nor would I. They're wideband drivers, designed to that remit. You can tune them moderately low, but they won't equal a quality midbass when used for that purpose.
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Old 16th July 2013, 04:21 PM   #5
Philfr is offline Philfr  France
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Thank's..
My first message was not specific enough..
The goal is to find a driver (around 6 pouces) with paper cone, Mms as low as possible, Le as low as possible, sensibility around 90 db, using in MLTL or MLTL Bipole.
I did not find any other candidates at reasonably price..
I am aware that it is a shame to use a fullrange for that.
My belief is that a driver with low Mms and low Le sounds better in bass.
Is that true ?
I don't know, but that's what I noticed at listening, better impulse, better details,
less streaking.. I'am not sure about "streaking", I would say then it's boom, it's not boooom. Maybe you say dynamic ?
Phil.
Use up 200 hz..

Last edited by Philfr; 16th July 2013 at 04:24 PM. Reason: forgetting
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Old 16th July 2013, 04:27 PM   #6
xrk971 is offline xrk971  United States
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Maybe by less 'streaking', you mean good transient reproduction? A MLTL may not be best for that. A sealed box is best, and probably a well-designed BLH/tapered TL is next best.

Last edited by xrk971; 16th July 2013 at 04:31 PM.
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Old 16th July 2013, 05:14 PM   #7
Philfr is offline Philfr  France
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Yes Xrk, good transient reproduction
Sure a sealed box or OB (straight or folded), was good design for that.
But do you think : low Mms and low Le = good transient ?
Phil.
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Old 16th July 2013, 06:06 PM   #8
xrk971 is offline xrk971  United States
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I don't know enough about driver parameters and how they specifically relate to certain performance characteristics, but I would guess that a low mass would equate to ability to accelerate the cone rapidly based on Newton's Second Law (F=ma). The inductance may have more to do with ultimate high frequency response rather than transients? I am not sure about that one. I could run a simulation in AkAbak and change just the Le and see what it does to the impulse response. That might be interesting.
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Old 16th July 2013, 06:45 PM   #9
IG81 is offline IG81  Canada
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Quote:
Originally Posted by xrk971 View Post
I don't know enough about driver parameters and how they specifically relate to certain performance characteristics, but I would guess that a low mass would equate to ability to accelerate the cone rapidly based on Newton's Second Law (F=ma). The inductance may have more to do with ultimate high frequency response rather than transients? I am not sure about that one. I could run a simulation in AkAbak and change just the Le and see what it does to the impulse response. That might be interesting.
I think Mms can be offset by a higher BL, but there is a limit to this at some point. I'm thinking Le is better kept low, but then again, it seems like other factors dominate driver behavior at low-frequency operation. What about plain ol' Qes? Seems like good damping goes hand-in-hand with impulse response, or is this incorrect?

In any case, if low Mms and Le are desired by the OP, either 165 or 225 are good candidates assuming all the other criteria of consideration fit the bill, I will not question the design at this point. Heck I was thinking of a midbass application for my FF225WK, but only because I already have it and don't want to be buying extra drivers at this moment.

IG
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Old 17th July 2013, 08:13 AM   #10
Philfr is offline Philfr  France
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Hi all,
I make predict with MJ King sheet, (MLTL FF165WK) with differents Le..
It's change a little, but it's not significative, I think ?
Thank's for comment.
Phil.
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