Spectralinear 1280 Speakers (Solar Audio Prod. Inc.)

Speaker Asylum

General speaker questions for audio and home theater.

I have two Spectralinear model 1280 speakers to repair for someone. Here is the description on the lable attached:

Spectralinear 1280
System Components: (4 component driver tower system) 12” (30.5cm) large excursion bass radiator
8” (20.3cm) Foam-edge suspension low/mid frequency driver.
4 ½” (11.4cm) sealed back edge treated midrange.
4 ½” Vertical aperture high frequency radiator.
Crossover Frequencies: 2000 Hz and 4500 Hz
Nominal Impedance: 8 ohms
Frequency Response: 34 Hz to 18,000 Hz
Recommended Amplifier Power Range: 5 – 50 watts (RMS) continuous per channel.
Cabinet: Simulated walnut grained finish with protective Melamine coating.
Dimensions: 34 ¾” H x 14 ½” W x 11 ¾” D (88cm H x 37cm W x 30cm D)
Shipping Weight: 41 lbs. (18.61Kg) each, packed 1 per carton.

LIMITED WARRANTY
Two Year Unconditional Parts and Labor Guarantee on all internal loudspeaker components providing unit is not abused, used beyond its intended limits or for professional use, or repaired or altered without our acknowledgment. Transportation charges to our factory or authorized agent not included. Repaired units under warranty will be returned freight pre-paid. See your dealer for in-warranty repairs.

SOLAR AUDIO PRODUCTS, INC.
3228 E. 50th Street, Los Angeles, Ca 90058

The foam surrounds on the 8" low/mid range drivers have completely disintegrated. I have new foam surrounds on order from Parts Express. The voice coils check OK and the voice coils move freely in their air gaps, so I expect the repair to go well.

The woofers are in good shape, so no repairs are needed there or with the midranges or tweeters. There are no adjustable level controls and no circuit breakers inside. The interior of the cabinets are lined with fiberglass. There is no tuning port so apparently they depend on the 8" low/mid driver to provide some loading and phase boost to the woofer at the low end. It will be interesting to see how these sound when repaired.

The owner uses them with a Kenwood-Trio KR2600 receiver which appears to be rated at about 15-20 watts per channel. The speakers likely are high efficiency speakers to be driven by amplifiers of relatively low power. I haven't seen anyone else post anything about these speakers so this is posted primarily for information.

Solar Audio Products, Inc. appears to be out of business after a run from late 1970s into the early 1980s or so. An internet search does not produce any indication of current products on the market.

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Topic - Spectralinear 1280 Speakers (Solar Audio Prod. Inc.) - strijw426 12:52:40 05/14/12 (5)

RE: Spectralinear 1280 Speakers Repaired - strijw426 15:42:39 05/24/12 (1)

RE: Spectralinear 1280 Passive Radiator Issue - strijw426 06:35:47 06/24/12 (0)

RE: Spectralinear 1280 Spkr Foam Surround Replacement - strijw426 13:17:27 05/22/12 (2)

RE: Spectralinear 1280 Spkr Foam Surround Replacement - strijw426 16:25:37 06/25/12 (0)

Suggestions - caspian@peak.org 11:50:19 06/25/12 (0)

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