would these be ok in a tapped horn or folded, any ideas, i got two the price is good - diyAudio
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Old 4th October 2010, 06:16 PM   #1
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Default would these be ok in a tapped horn or folded, any ideas, i got two the price is good

Peerless 830586 8" SLS Shielded Woofer

Was: $35.00 EA
Save 31%
Special Price: $24.00 EA (1-3)
$21.68 EA (4+)

Sku 299-246: In Stock

Perfect woofer for equalized sealed box designs. Stamped steel frame with generous ventilation and minimal airflow restriction. 1-1/2" two-layer copper voice coil with 1" winding. Shielded magnet, 4 ohm impedance. Buyout, limited quantities. Specifications: *Power handling: 125 watts RMS/250 watts max *VCdia: 1-1/2" *Le: 0.97 mH *Impedance: 4 ohms *Re: 3.4 ohms *Frequency response: 45-2,000 Hz *Fs: 45 Hz *SPL: 85 dB 1W/1m *Vas: 0.72 cu. ft. *Qms: 6.19 *Qes: 0.96 *Qts: 0.83 *Xmax: 8 mm *Dimensions: A: 8-3/16", B: 7", C: 4-1/4".
Premium sculpted stamped steel chassis
Vented pole piece and under-spider venting
Treated long-fiber paper cone with rubber edge
Oversized felt dust cap
2-layer front gasket
Bumped backplate permits maximum linear excursion
Magnetically shielded
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Old 4th October 2010, 06:59 PM   #2
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I have a pair sitting in my office ready to be tested. As supplied, the Qes is too high, but I think if I knock off the bucking magnet, things may improve....
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Old 7th October 2010, 08:08 PM   #3
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by mastadon View Post
Peerless 830586 8" SLS Shielded Woofer

Was: $35.00 EA
Save 31%
Special Price: $24.00 EA (1-3)
$21.68 EA (4+)

Sku 299-246: In Stock

Perfect woofer for equalized sealed box designs. Stamped steel frame with generous ventilation and minimal airflow restriction. 1-1/2" two-layer copper voice coil with 1" winding. Shielded magnet, 4 ohm impedance. Buyout, limited quantities. Specifications: *Power handling: 125 watts RMS/250 watts max *VCdia: 1-1/2" *Le: 0.97 mH *Impedance: 4 ohms *Re: 3.4 ohms *Frequency response: 45-2,000 Hz *Fs: 45 Hz *SPL: 85 dB 1W/1m *Vas: 0.72 cu. ft. *Qms: 6.19 *Qes: 0.96 *Qts: 0.83 *Xmax: 8 mm *Dimensions: A: 8-3/16", B: 7", C: 4-1/4".
Premium sculpted stamped steel chassis
Vented pole piece and under-spider venting
Treated long-fiber paper cone with rubber edge
Oversized felt dust cap
2-layer front gasket
Bumped backplate permits maximum linear excursion
Magnetically shielded
FYI, A TL simulation:

b
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File Type: jpg Peerless830586-aperiodic TL.JPG (571.6 KB, 288 views)
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Old 7th October 2010, 11:17 PM   #4
GM is offline GM  United States
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Originally Posted by littlemike View Post
As supplied, the Qes is too high, but I think if I knock off the bucking magnet, things may improve....
In theory, Qes will increase...........

GM
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Old 7th October 2010, 11:25 PM   #5
wg_ski is offline wg_ski  United States
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I thought the bucking magnet *decreased* the BL slightly, and that you get in increase in the field when you dispense with it. But certainly not by enough to make a speaker more horn-friendly....
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Old 7th October 2010, 11:31 PM   #6
GM is offline GM  United States
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Quote:
Originally Posted by littlemike View Post
As supplied, the Qes is too high....
Maybe, maybe not, only one way to know for sure........

GM
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File Type: gif Peerless 830586 SLS DTS concept - specs.gif (14.9 KB, 260 views)
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Old 7th October 2010, 11:43 PM   #7
GM is offline GM  United States
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Quote:
Originally Posted by wg_ski View Post
I thought the bucking magnet *decreased* the BL slightly, and that you get in increase in the field when you dispense with it. But certainly not by enough to make a speaker more horn-friendly....
IME, adding a magnet either did nothing or slightly lowered Qes, ergo taking it off may increase it, but I agree that it probably won't be enough to audibly affect the design. That said, there was a small Audax that could be had either way and the shielding dropped it almost 20% IIRC, but I've never seen anywhere this much on the 8"-up drivers I've messed with and finally settled for using cold rolled steel (CRS) sheet in the cab to shield larger, more powerful drivers.

GM
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Old 9th October 2010, 12:44 AM   #8
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Well, we'll find out soon enough. I will measure a driver, then knock off the bucking magnet and remeasure. If they're not useful without the magnet, I'll send them out to live on the shelf of useless woofers I have out in the shop....

Might be a few more days though - I'm plenty busy with other projects.
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Old 9th October 2010, 12:46 AM   #9
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Originally Posted by GM View Post
Maybe, maybe not, only one way to know for sure........

GM
Oh - I agree that it was worth a look - that is why I bought them.

This driver is not bad by any stretch, it just has its limitations.
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Old 10th October 2010, 01:47 PM   #10
jbell is offline jbell  United States
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Originally Posted by littlemike View Post
Well, we'll find out soon enough. I will measure a driver, then knock off the bucking magnet and remeasure. If they're not useful without the magnet, I'll send them out to live on the shelf of useless woofers I have out in the shop....

Might be a few more days though - I'm plenty busy with other projects.
I thought I was the only one with a speaker addiction....

My name is littlemike, and it's been 3 days since my last speaker purchase....

HI MIKE !!
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