Woofer (not sub) to go with the W3-871S

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#21
GrahamnDodder said:


Would it be to balance out the fact that you have really good, really cheap (relative to the rest of the world) legal cannabis there?
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[offtopic] No sorry, I don't smoke it 😀 But you are right, every country has its advantages 😉 (and yeah.. it is cheap. You can get really wasted for under 10 Euro's 😉) [/offtopic]

Back ontopic 😀

I am still playing with the idea of using either a Peerless woofer (CSC 6,5" or CSX 5") or the Intertechnik MDS08

The latter one has the advantages of being 8" and really goodlooking (kevlar)
Disadvantages are that it is a 4 Ohm unit (the Tangbands are 8") and that the Peerless units are better known (so I can steal box-designs 😉)

Will the 4Ohm be a problem? And what would be a nice frequency to cross at? I'd like to keep as much of the sound of the Tangband because I really like it, but if I cross a little higher the power-handling improves offcourse 🙂 So I am currently thinking about either:
- letting the Tangband fall-off naturally or maybe helping it a little with a first order filter around 130Hz (they now do -3dB @ 118Hz I believe)
- cross first-order at say.. 200Hz? 250?? 300??? and let the woofer play along a little higher so I can handle higher volumes.

Isn't she a beauty by the way? 😉
An externally hosted image should be here but it was not working when we last tested it.
 
#22
Razorfist said:


Will the 4Ohm be a problem? And what would be a nice frequency to cross at? I'd like to keep as much of the sound of the Tangband because I really like it, but if I cross a little higher the power-handling improves offcourse 🙂 So I am currently thinking about either:
- letting the Tangband fall-off naturally or maybe helping it a little with a first order filter around 130Hz (they now do -3dB @ 118Hz I believe)
- cross first-order at say.. 200Hz? 250?? 300??? and let the woofer play along a little higher so I can handle higher volumes.
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any comment?
 
#23
I have two old 30 cm boomers from Cabasse (30BZ18) that I have decided to reactivate. 😉

My idea is to built a tower speaker with 4 W3-871s.
The boomers xover point in their previous 3 way (Sampan) configuration was 900 hz.
I think I will reduce it to 400 - 350 hz with second order xover point.
....But I'm still waiting for a quote from Nuera Acoustic (Ca) :bawling:
 

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#24
coolkhoa said:
there is a perceivable difference in "speed" between a 6.5" and a similar 8" unit
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This subject -- that of fast woofers -- has been better to death. A woofer cannot be fast -- a woofer would have to be a tweeter to be fast. And generalizing about anything so broad is fraught with sink-holes to fall in....

Back on subject, it seems my 871s have found a home & a partner. I've ended up with a rejected set of cabinets that were built for some Audio Note kits... the 871 pops perfectly into the tweeter hole -- i'll add a piece of 4" PVC out to the back (and leave it sealed or open it up to the world), and a set of 8" vintage Coral woofers. XO around 250-300 Hz.

dave
 
#25
Hi everyone.

I got interested in 871's since I found John Krutke's computer speaker project (thanks to him!) Because of W3-871's small xmax I've been thinking of using additional driver for lower frequencies, though. However, this additional unit has to be magnetically shielded because of its application. BAM already mentioned TB's minisubs and I've been thinking of using one of those - W4-992S in particular.

According to other threads, however, T/S parameters mentioned in TB's homepage are incorrect. Does anyone have information if this applies also to W4-992S? And more importantly: has anyone used this driver in his/her design? I've been considering an enclosure with ~3l sealed compartment for W3-871s and ~4l ported compartment tuned to 60Hz for W4-992S, does this seem ok to you?

Major problem will be the crossover. I'm a newbie in this field but since the frequency responses of two drivers in question overlap quite considerably, I've hoped to manage with 1st order crossover. Crossover frequency of 400-500Hz might be high enough to make sure that 871S won't exceed its xmax. On the other hand, f3 from baffle step is most likely in 800Hz area so maybe I could use higher xover freq. and compensate baffle step with "woofer". As I said, I'm completely a newbie in this field but I have to start somewhere.

Anyway, the point of this message was: Is W4-992S a suitable companion for W3-871S? Thanks for any info.


Best regards,

Mikko.
 
#27
Sorry, I can't help you on the crossover question.

As for my question in this topic, I decided not to go for continuing with this speaker, but to leave them like this (perfect for computer use with a subwoofer in the future.. or something else)

For my main speakers I am going to build a completely new set consisting of Seas 27TFF tweeters and Seas G17REX/P woofers (thanks to Indoubt for the designs and crossover)

Good luck on this one 🙂
 
#29
Thanks for the comment Timn8ter. However, W4-992S and W3-319S1 are quite different drivers - former is even titled as minisub and latter a full-range driver. Also the driver parameters vary a lot:
W4-992S: fs = 55Hz Qts = 0,35 Vas = 5,72l xmax = 3,5mm
W3-319S1: fs = 100Hz Qts = 0,53 Vas = 1,68l xmax = 0,2mm

I believe that W3-319S1 has way too low xmax to be usable in lower frequency region, I haven't simulated it, though. In addition to that W4-992 has major varition in frequency response just above 2kHz so I'm not so certain that 1st order crossover would be steep enough. Although I'm not an expert in this field as I said 😕

Anyway, I'll deal with the crossover later, first I'd like to know whether these two make a decent couple at all.

Best regards,
Mikko
 
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