speaker amplifier 1

As a start, I think it would be best to start with a midrange speaker set. I am considering Sony SS-F5000 Floor Standing Speakers. They come in pairs.

• Frequency Response : 45 - 50,000 Hz
• Impedance : 8 Ohms
• Mid Range Size(s) : 3 ¼” Midrange Driver
• Power Requirements : 150W
• Quantity (Packaged) : 2
• Quantity of Tweeters : 1
• Quantity of Woofer(s) : 2
• Sensitivity : 88 dB
• Speaker Terminal Type : Binding Post
• Tweeter Size : 1" (2.5 cm)
• Woofer Size(s) : 8" Woofer

A 150 Watts and 8 Ohm impedance results in a peak amplitude of 4.33 Amperes and 34.6 Volts. The frequency response is higher than I would like, but it will do for the price.

My whole goal is to do away with a lot of the necessary components needed for audio amplification. A receiver can be a very complex and pricey piece of equipment. You get what you pay for. Sometimes it is nice to have a lot of bells and whistles, but sometimes you just want high fidelity. I am going for fidelity.

It is simply connected to a computer with a head phone jack. The audio signal is digitized. The 8-bits are sent to the speaker site using a parallel port. Because the signal is digital, the distance possible before high distortion is greatly increased. The speakers are given a pulse width modulated carrier signal, which is filtered.

Keep tuned.

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Electrical Design Engineer, Minneapolis, Minnesota