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Old 19th June 2006, 03:02 AM   #1
mrdon is offline mrdon  United States
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Location: Hawthorne, NJ
Question Cabinets for Vintage Full Range Lafayette SK-98's

I was recently given two of these vintage Lafayette 8" Full Range drivers by a family member.
Click the image to open in full size. Click the image to open in full size.

They are unused with one still sealed. After googling, I found them to be real fine drivers, manufactured in Japan by Pioneer. One person claims they are "Japan's answer to the Altec 755."

Here's the specs:
freq. response = 40-16,000 cycles,
Fs = 55-70 cycles
99.5dB/watt sensitivity
10,500 gauss/56,000 maxwells alnico magnet and 8 ohm voice coil

OK, so can anyone recommend a simple cabinet design for these? I would be using them with a 14W/Channel SET and an AMP6 (Class D, 20W/Channel?). Thanks!
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Old 19th June 2006, 05:18 AM   #2
GM is offline GM  United States
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Default Re: Cabinets for Vintage Full Range Lafayette SK-98's

Greets!

Yeah, these sounded pretty good new and at ~$12, reasonably priced for the times, but I wouldn't swap any usable 755s for them. FWIW, fairly recently someone measured a NOS pair with these averaged results, which indicates the suspensions has dried out with age:

Fs 91 Hz
Vas 0.89 ft^3 (25.202 L)
Qms 4.90
Qes 0.84
Qts 0.72
Re 6.88 ohms
Le 0.78 mH

95.4 dB/w/m

With these specs, a large OB or ~160 L sealed cab is called for, though a large folded pipe will have somewhat more bass, but it's a little more complicated to build.

GM
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Old 19th June 2006, 10:04 AM   #3
fred76 is offline fred76  Philippines
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Hi,

Id like to add that a good tweak is to remove the magnet covers (store the covers in a safe place). Those covers most often is a source of 'ringing' even if screwed on tightly.

BTW, there's a useful spreadsheet by TL (aka Kuei Yang Wang here) in the Single Driver Website for OB's.

regards,
fred
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