OT - HMS - or will this wok

An amp can "push uphill" (eg, 4 ohm amp into 8 ohm speakers) without damage, but going "downhill" heats up the chassis right now, boom. Ohm's law of series and parallel applies to speaker arrays, so you should be able to team your 4 ohm speakers with, say, 16 ohm tweeters, for instance, or (with appropriate advice) a faked-load resistor, and make a chain of 8 ohm or higher load.

Bill, 4 ohm speakers are low efficiency and need lots of watts to drive. Best to stick with 8 ohm...

JT

(Who still has 16 ohm E/V stereo stuff...)

Ahhhh... All of my 16 ohm speakers are considered high efficiency. IOW, 25 watts of power will produce deafening sound while the usual watts being applied in the 4-5 watt range.

By efficiency, I mean the very basic interpretation, watts required to produce the same DB level.

The first low efficiency speaker I remember were produced by Accoustic Research. Lower impedance permitted lower magnet weights with power controlling the speaker accuracy rather than the magnet size. Today, that has been magnified many fold.

Also, the old speakers in their simplicity allowed for extreme long cone life as opposed to today's powered units that are shot in a few years.

YMMV

JT

John Poulos wrote:

Easiest way to interface this is to get a pair of 2:1 step down, audio freq, transformers. I look for old stero eqpt at the flea mkts, and use what i need.

The transformers are a excellant impedance matching devices. Jim

Don't waste your time Bill, the 1-2 watt output of the factory radio will not drive the speakers even without the transformer loss.

jimandkathiekrise wrote: