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Wednesday, June 13, 2012

Free Bass Speakers

What can be better than to look in the garage,
and find a subwoofer cabinet with old bass speakers,
ready for a reconditioning and new start?

There it was, an old car cab, probably used for bass booming,
or outdoor party bass reinforcement.

Two Pyramid Super Pro Super Blue bass woofers:

The dust caps had been apparently pushed in,
and the exposure to weather had caused the butyl rubber surrounds
to come loose.
Yet they were basically sound.
I removed the hot-glue which had been used by a previous owner
in an attempt to fix them.
Then I sanded and scraped off the metal frame,
and carefully glued down the rubber with Gorilla Glue (super glue).

The Speakers, Prior to Repair:

I got new foam gaskets as well, 
and our Speaker Shop man kindly provided me with 
a new set of dust-caps, which were designed to smooth higher frequencies.

The result, two solid bass woofers as good as new, perhaps better!

I installed one in a cabinet I had made from an IKEA endtable as a test:

This is a picture of speaker before installing the new dust-caps.

Here are the original specs:

PW 1258-US (12" 8 ohm version)

They sell both at Parts Express for about $49.75

Power handling: 300 watts RMS *
VCdia: 2" *
Znom: 8 ohms *
Frequency response: 40-3,000 Hz *
Fs: 26.29 Hz *
SPL: 90 dB 1W/1m *
Vas: 7.54 cu. ft. *
Qms: 9.94 *
Qes: .36 *
Qts: .35 *
Xmax: 4.6mm *
Net weight: 9-1/8 lbs.

Suitable for woofer or subwoofer duty.

Here is the blurb for the 4 ohm version:

The Super Blue Series features a heavy duty blue
polymer laminate paper cone with a butyl rubber surround
for long life and durability.

The combination of 2" Kapton voice coil,
extended bump plate and vented magnet structure
allows for high power handling capability and high SPLs!
Ideal for all high performance car audio applications.
Made in the U.S.A.

Specifications: *

Power handling: 250 watts RMS/355 watts max. *
Voice coil diameter: 2" *
Impedance: 4 ohms *
Frequency response: 30-1,800 Hz *
Magnet weight: 50 oz. *
Fs: 27 Hz *
SPL: 94 dB 1W/1m *
Vas: 8.11cu. ft. *
Qms: 8.74 *
Qes: .31 *
Qts: .30 *
Xmax: 4.6mm *
Net weight: 10 lbs. *

Manufacturer model number: PW1254-US *
Dimensions: Overall Diameter: 12-1/8",
Cutout Diameter: 11",
Mounting Depth: 5-1/4",
Magnet Diameter: 5-1/4",
Magnet Height: 1-3/4".

Looks like these will be great speakers for general bass reproduction, below 3 kHz.

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