Dynaco A25 Speakers

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mresseguie

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Re: Dynaco A25 Speakers
« Reply #40 on: 7 Jun 2020, 03:43 pm »

Tom Bombadil

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Re: Dynaco A25 Speakers
« Reply #41 on: 7 Jun 2020, 09:34 pm »
One of the popular "urban legends" about the A25 is that its sensitivity (efficiency) is 90db/1W/1M.

This number comes from an old Stereophile review published in the 1970s.  It did say they measured at 90db, but it was with a 10 watt signal at 6'.   Which means they are actually around 83db/1W/1M. 

There were two other published measurements on them back in the 1970s, one put them at 83db, the other at 84db. 

I bet I've seen people post that they are 90db efficient a few hundred times. 

dB Cooper

Re: Dynaco A25 Speakers
« Reply #42 on: 7 Jun 2020, 11:30 pm »
Those lower numbers sound about right- and in the ballpark for most similar speakers of the era. As the saying goes, though, numbers can be deceiving, and the flatter-than-usual impedance curve probably allowed most amps to deliver more usable power than some other speakers.

The later A25XL was about 3dB more sensitive.