Coytee Posted July 11, 2005 Share Posted July 11, 2005 How do you digest this rating of efficiency? Is this an accurate way to represent efficiency or as I seem to recall some comments, is this just using a narrow band since it speaks of midband and high frequency SPLs? And furthermore, what does the (10ms) mean? Microseconds of duration? ___________________________________________________________ Recommended Amplifier power: 1.5 watts per ch minimum / 500 watts maximum Sound Pressure Level: 97 db average 100 db peak with a 1.5 watt amplifier; 115 db average, 125db peak (10ms) with a 500 watt amplifier Mid-band Sound Pressure Levels in a Typical Listening room: 90 db average, 100 db peak with a 1.5 watt amplifier: 115 average, 125 db peak (10 ms) with a 500 watt amplifier. Maximum High Frequency Sound Pressure Level in a Typical Listening Room (10,000 Hz): 103 db long-term average Mid-band Power Capacity: 50 watts long-term average: 500 watts peak (10ms) Quote Link to comment Share on other sites More sharing options...
DrWho Posted July 11, 2005 Share Posted July 11, 2005 It's more of a rating of power-handling with the speaker sensitivity buried in the specs. Basically those speakers (whatever they are) probably have a sensitivity of about 90dB with 1 watt at 1 meter They're saying that a 1.5 watt tube amp can probably put out 3 watts for short periods of time which is where that 100dB peak comes from. The 125dB peak (10ms) means that the speaker can handle 125dB for 10ms...it's basically a thermal limitation on the driver that it can handle 500 watts for that short amount of time (10ms (milliseconds) = 0.1 seconds). (Btw, 500 watts for 125dB also corresponds to about 94dB sensitivity...though it might be slightly higher due to power compression, say around 96dB). I think they rated the speaker in this manner for someone that plans on bi-amping the system...that way they just match the amp wattage with whatever output they're looking for. They of course picked values that make the speaker appear better than it is. Most people don't want to go through the thinking necessary to realize what the specs are really saying...basically that it's really not going to do 125dB, but will be more like 103dB. I'm guessing the people interested in these speakers are probably jazz or classical listeners so that 103dB is more than enough (these certainly aren't speakers for rocking it out). Quote Link to comment Share on other sites More sharing options...
scriven Posted July 11, 2005 Share Posted July 11, 2005 ---------------- On 7/11/2005 2:59:34 PM DrWho wrote: ...(10ms (milliseconds) = 0.1 seconds)... ---------------- 10ms = 0.01 seconds! Quote Link to comment Share on other sites More sharing options...
DrWho Posted July 11, 2005 Share Posted July 11, 2005 Aw crap...there's prob a reason all my professors always write it 0.01 instead of .01! I still refuse to conform though... Quote Link to comment Share on other sites More sharing options...
Spkrdctr Posted July 12, 2005 Share Posted July 12, 2005 Scriven beat me to the corection! But, Dr Who is still a good guy to go to for answers........... seems we both have a lot of the same experiences. Quote Link to comment Share on other sites More sharing options...
MrMcGoo Posted July 13, 2005 Share Posted July 13, 2005 It's no big deal to be off by an order of magintude. Bill Quote Link to comment Share on other sites More sharing options...
Spkrdctr Posted July 13, 2005 Share Posted July 13, 2005 Bill, you went to the issue like a laser beam! An order of magnitude here and there, pretty soon it really adds up to something! Kind of like our Federal Budget........ Quote Link to comment Share on other sites More sharing options...
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