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Re: building keyboard speakers - driver question

Posted by DMW (S) on June 24, 2005 at 07:52:28

In Reply to: building keyboard speakers - driver question posted by RBS on June 23, 2005 at 19:26:28:

If you can locate a CTS/Motorola KSN 1188, think about using that. You really should cross-over under 2,000 Hz, and you can do so with this driver (as low as 800 Hz, but a bit higher is probably better, perhaps 1500 hz). If you use it, be sure to use an 8 Ohm power resistor across the terminals of the driver, and calculate your crossover component(s) based on 8 Ohms. You may not have to pad this driver, but if you do, that's pretty easy. This driver has a 1.5 mfd capacitance (the others are much lower). If you use a 1.5 mfd cap AFTER the crossover network (probably a simple capacitor before the driver and resistor across the terminals) this will pad the driver by 6 dB, for example. Use quality high voltage film caps and audio grade power resistors for the best result. BTW, other CTS/Motorola drivers should use a 22 Ohm resistor across the input terminals of the driver.

Mike Klasco, who helped design this driver, had an article in Speaker Builder some years ago about this very application with the same speaker and horn driver.

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