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Best 8 inch woofer?
Best 8 inch woofer?
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Old 7th August 2015, 10:49 PM   #1
acstcwrfrmn is offline acstcwrfrmn  United States
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Default Best 8 inch woofer?

Hi guys (and gals),

I have been designing, building and testing speaker systems since the early '70's so I am quite experienced (only for personal pleasure, close friends, family, etc.).

I need a very well designed and great performing 8 inch woofer in the $150 and under range for my next project. I am retired so I think up different designs weekly; sometimes daily!

Box is to be not much larger than 1 ft^3 (28L) and closed design ONLY. This will be a true 3-way; X/O on the low end 200Hz to 400Hz. I'm planning on a 4 to 5 inch fullrange used as a mid from say 200 to well over 4KHz (maybe as high as 6KHz). The tweeter will need to be high output (> 93dB) because of my 60 year old hearing restrictions.

I'm thinking Seas Prestige has the advantage; looking for Fs 20Hz to no more than 27Hz. I have heard HiVi and Aurum Cantus specs. are WAY off! Scan discovery doesn't have any 8 inchers with this low of a Fs.

Comments? Questions? Ideas? Experiences?

This is for a small space only. Vented and TL's are too big for this space. Also, a tuned vented system at say 40Hz will not work since I often listen to pipe organ music. 16Hz on a 40Hz vented will reach X-max at less than 10 Watts. I don't expect deep bass obviously; subs. to come later. If I can get and F3 in the mid. to lower 50's thats good enough!

Thanks!
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Old 7th August 2015, 11:11 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

Low Fs 8"ers dedicated to sealed are hard to find.
Dayton Audio RS225-8 8" Reference Woofer
Is hard to beat. Low Fs with high Vas is pointless in 1 cuft.

rgds, sreten.
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Old 7th August 2015, 11:20 PM   #3
acstcwrfrmn is offline acstcwrfrmn  United States
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Quote:
Originally Posted by sreten View Post
Hi,

Low Fs 8"ers dedicated to sealed are hard to find.
Dayton Audio RS225-8 8" Reference Woofer
Is hard to beat. Low Fs with high Vas is pointless in 1 cuft.

rgds, sreten.
OK thanks for the input. Actually, there are some 8 in. woofers with very low Fs and high Vas both BUT, the Qe and Qt ARE a very good match for a closed box. The L22 and CD22 Seas Prestige both are perfect examples of this. I don't have modeling software but I trust the Seas OEM specs. to be accurate. These are the 4 layer voice coil units (I don't have the specs. in front of me but have already checked the calculations). The Daytons have WAY too high Q's to fit the bill. Low Fs, Low Q's will work assuming the Vas is in the range of 100L to maybe 120. Check it out and do the math. These WILL work; Troels has also done some testing here as well.
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Old 7th August 2015, 11:44 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

No. The Daytons have much lower Vas than 100L to 120L.
Hence the the Fs is higher. You haven't done the maths.

Your talking complete nonsense. The Dayton I linked to
will be Qbox = < 0.7 in 1 cuft, no way is Qts WAY too high.

Your missing a vital point, the effect of the Vbox to Vas ratio
affecting the Qts to Qbox ratio and the Fs to Fbox ratio.

rgds, sreten.

Last edited by sreten; 8th August 2015 at 12:09 AM.
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Old 7th August 2015, 11:49 PM   #5
Zuhl is offline Zuhl  England
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I use the standard L22 in 28ltr closed box for my three way http://www.diyaudio.com/forums/multi...ay-design.html

Bass is very crisp, clean and detailed. It is designed to work with a sub, so the bass rolls of naturally below 100hz; it still has good output low down though and can work on its own without the sub.
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Old 7th August 2015, 11:54 PM   #6
ScottG is offline ScottG  United States
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..consider looking at a DVC woofer with good excrusion.

1 coil can integrate with your 3-way,

..the other coil can be powered with a subwoofer plate amp and can extend your lower freq. extension and even offer some opportunities for in-room eq..



I should also note the usual caveat with respect to baffle-step loss and overall efficency of the loudspeaker if it's a passive crossover design.
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Last edited by ScottG; 8th August 2015 at 12:05 AM.
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Old 7th August 2015, 11:59 PM   #7
acstcwrfrmn is offline acstcwrfrmn  United States
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I think that people may be missing the point here. A closed box can do many things. Just as vented, TL, etc. The whole point here is to match the proven OEM TSP's to a closed box not much larger than 1 ft^3. I have about 50 designs under my belt and do know what I'm talking about. A very high Q is usually associated with a closed box while lower Q's are usually vented, etc. Any driver with BOTH high Q's and Vas BOTH will not work in a SMALLER closed box. The Daytons, HiVi, SB, etc. would require a much larger closed and/or vented box both. The goal here is to be less than $150, 8 inch and do somewhere in the mid to low 50's in a closed box that can fit in a small room. I had a design once that did 12Hz to 23KHz in a large room for under $1000. Of course, this was 20 years ago. Please; only experienced people need apply here. I am a retired Enginner; do NOT try to BS me!
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Old 8th August 2015, 12:07 AM   #8
ScottG is offline ScottG  United States
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Quote:
Originally Posted by acstcwrfrmn View Post
I think that people may be missing the point here. A closed box can do many things. Just as vented, TL, etc. The whole point here is to match the proven OEM TSP's to a closed box not much larger than 1 ft^3. I have about 50 designs under my belt and do know what I'm talking about. A very high Q is usually associated with a closed box while lower Q's are usually vented, etc. Any driver with BOTH high Q's and Vas BOTH will not work in a SMALLER closed box. The Daytons, HiVi, SB, etc. would require a much larger closed and/or vented box both. The goal here is to be less than $150, 8 inch and do somewhere in the mid to low 50's in a closed box that can fit in a small room. I had a design once that did 12Hz to 23KHz in a large room for under $1000. Of course, this was 20 years ago. Please; only experienced people need apply here. I am a retired Enginner; do NOT try to BS me!

Don't worry about what you think it can and can't do - that's what modeler's are for.
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Old 8th August 2015, 12:33 AM   #9
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by acstcwrfrmn View Post
I am a retired Enginner; do NOT try to BS me!
Hi,

And full of tediously biased BS. The Dayton I posted does
around -3dB @ 50Hz in a 1 cuft box with a Qbox of 0.66.
Well stuffed would be even better transient wise.

rgds, sreten.

Real engineers never talk crap.

Last edited by sreten; 8th August 2015 at 12:55 AM.
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Old 8th August 2015, 12:45 AM   #10
Sonce is offline Sonce  Macedonia
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Quote:
Originally Posted by acstcwrfrmn View Post
The Daytons have WAY too high Q's to fit the bill.
No, Sreten is right, Dayton RS225-8 has ideal TS parameters for a closed box. Simple math (presuming the published TS parameters are close to truth):

Let choose Qtc=2xQts=0.76 (with stuffing will be less than 0.7)
Then, volume of the box Vb=Vas/((Qtc/Qts)^2-1) = Vas/(4-1) = 2cuf/3=2/3 cuf
When you add volume occupied by the woofer and the midrange box, it will fit in your 1 cuf box.

Edit: Sreten was quicker than me in posting.
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