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September 30, 2012 - 6:09am
#1
What impedance speakers for my vintage amp?
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and a sensitivity of 85dB/1w/1m or higher will work with that amplifier. If you have a largish room you probably should consider sensitivity above 88dB/1w/1m.
Most speakers will be in the 4 to 8 ohm range, so impedance is not the problem.
I would definitely suggest that you get speakers with high sensitivity, preferably 90 db/watt or so, since the power rating is relatively low.
The Monitor Audio Bronze BX-2 or BX-5 would be good choices.
KEF and Wharfedale are other good ones to consider.
Check Carlton Audio-Visual in Australia and AVAustralia.
Hmmm ok, I guess I need to learn what speaker sensitivity is!
Thank you! Any more light and knowledge!?
Speaker sensitivity is rated in db/watt/meter.
This is determined by applying 1 watt of power to the speaker and measuring the loudness in acoustic decibels, or dbA, 1 meter in front of the speaker with calibrated instruments.
Each 3 db change represents twice as much. Each 10 db is 10 times as much (the scale is logarithmic).
For example, a speaker rated for 90 db/w/m is twice as sensitive as a speaker rated 87 db/w/m.
40 watts of power applied to a speaker with 90 db/w/m with give an acoustic output of 3db + 3db + 10 db +90db = 106 dbA. To get that same sound level with a speaker rated at 87 db/w/m will require 80 watts of power from the amplifier.
Another way of looking at it is this; a speaker with a 87 db/w/m rating needs twice as much amplifier power as one rated 90 db/w/m to produce the same amount of sound.
A less sensitive speaker needs a lot more amplifier power to give the same result.
With your relatively low-powered amplifier, speakers rated 90 db/w/m or higher will most likely give you plenty of loudness. If you get less sensitive speakers, your amplifier may be inadequate.