Speaker warning label impedance

B

b_sdaddy

Well-Known Member
Hi,

there's a sticker on the back of a "Mission" Cyrus One amplifier.
It says "Minimum 8 ohm"

What would the maximum be then? Do I go up in value to 16, or down, to 4ohm?

I'd like to run them with 94dB speakers that are 4 ohm.

Cheers!
 
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You need to go higher in impedance. The lower the impedance, the bigger load on the amplifier - more heat. So, don't go to 4 ohm speakers.

Doug
 
Yes, the lower the number, the closer the speaker gets to looking like a short to the amplifier and more current flows, making more heat. Too much heat, of course, will destroy the output transistors.

Doug
 
Also remember that when you see an impedance rating for a speaker, it is usually the nominal impedance, meaning that under certain conditions (type of music being played, maybe with a lot of bass content, at high volumes), it is quite possible for the impedance to drop substantially below the rated figure. Many amplifiers will be quite unhappy with a situation such as this. Certain speakers (Infinity Kappa 9s, and Apogee Scintillas come to mind) can be extremely difficult to drive, and have a reputation as "amp killers". It`s always best to have equipment that is compatible, with enough "safety zone" so that nothing gets damaged.
Happy hunting !
 
Operator manual available at Hifiengine. https://www.hifiengine.com/manual_library/cyrus/1.shtml

I'd strongly recommend reading it over. Although it's a bit contradictory regarding safe operating load. It contains an important list of DO NOT's.

While the manual clearly states 8 ohm minimum speakers, it also clearly gives a 4 ohm continuous power spec.

Given the age of the amp, i wouldn't run any speakers on it until it's been across a competent tech's bench for some preventive service. I wouldn't risk breaking any of it's likely unobtanium parts.
 
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