Description: Vintage 1972 3 1/2" Midrange 247131 from Martin Crescendo 430 Spectrum Slope Speaker System by Eastman Sound Mfg Company, Paulsboro, NJ. Driver as shown in the photos. This has not been tested and are being sold AS-IS. Dimensions are 4 inches in diameter by 1.25 inches deep, weighing almost a pound. Adapted from Audio magazine, Oct. 1972 to https://www.gammaelectronics.xyz/audio_10-1972_eastman.html MANUFACTURER'S SPECIFICATIONSSystem Type: three-way, totally enclosed.Components: One 12-in. woofer, one 3 1/2-in. mid-range and one 2 1/2-in. cone tweeter.Frequency Response: 30 to 18,000 HzPower Handling: 60 watts.Nominal Impedance: 8 ohms.The "Crescendo" bass unit has a large magnet and a 2-in. voice coil with a flexible cone surround to permit wide excursions. Free air resonance is 22 Hz and the cross-over frequency is around 700 Hz. The midrange speaker is a 3 1/2-in. closed-back type and it has a small center-dome to aid dispersion. At 6 kHz, another crossover transfers the output to the tweeter which also has a center-dome. Both cross-over slopes are very gentle at 6 dB per octave, thus giving a smooth transition and avoiding the annoying impression of three separate sound sources which sometimes occurs with steep-cut crossovers. Level controls are fitted for both middle and treble ranges.
Price: 20 USD
Location: New Port Richey, Florida
End Time: 2025-01-12T22:13:10.000Z
Shipping Cost: N/A USD
Product Images
Item Specifics
All returns accepted: ReturnsNotAccepted
Brand: Eastman Sound Mfg. Company, Inc.
Model: Martin Crescendo 430
MPN: Does Not Apply
Country/Region of Manufacture: United States
