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In Reply to: RE: REVIEW: Avantgarde Trio Speakers posted by moray james on March 30, 2014 at 12:22:17
Moray James wrote: "The loudspeaker system efficiency will always be set by the lowest efficiency speaker in the system and in your case that will be the woofers. There is no possible way that your woofers are even achieving anywhere near 100 db much less 110 db across their band. Below 100 Hz a reasonable efficiency guess would be perhaps a true 95 - 96db for those boxes."
This rule is, of course, true, except for when it is not true.
If you biamplify, triamplify, etc., with a line level crossover then the situation becomes more complex as well as more versatile and interesting.
Follow Ups:
you can biamp all you like but you cannot ever hope to come remotely close to the efficiency stated (110 db)you won't have the available power and you wont have the power handling even if you did have the power at hand. You just can't pull an elephant out of a shoe box. That said I am sure these are fine sounding loudspeakers. Best regards
moray james
I agree their numbers are an exaggeration, but isn't the point for most of the aficionados here to use flea or other low watt amps, in which case the bandwidth over which this system (> 100hz) provides a fairly high sensitivity.
I don't know anyone in a small home room that really needs 105+db/w sensitivity for the first two octaves. I would think a stout SS amp with typical highish gain for the low section mated with a aforementioned small watt amp with lower gain would work well in a domestic environment. Would it not?
I guess, what I am saying, is that while 110db is obviously a marketing creative license, for practical purposes it is conveys the appropriate practical usage.
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"When Khruschev said "we will bury you" I don't think he meant with surplus parts." zacster
Right and wrong at the same time.All the Avantgarde models come with amplifier for the woofers, so their efficiency (or lack thereof) is moot.
The Community M200 used in the midrange of the Trio is about 108.5dB/W on a horn with a Di=7. The horn they are on looks like a tractrix, and could very well have a Di=10, and thus it would be 111.5dB. It very well may be that high as they have a special voice-coil made for their M200 so as to not have to use a resistive pad in the network.
Same comments apply to the Beyma CP380M they use for the tweeter.
The link is a similar HF driver from Faital Pro on a tractrix horn, it looks like you could claim it to be 110dB (which they do).
http://www.communitypro.com/files/literature/spec%20sheets/M200A_SPEC.pdf?phpMyAdmin=c9cc5b3953d87385dc22218d669e7aab
http://www.usspeaker.com/beyma%20CP380M-1.htm
Note, the Beyma is on a CD horn, so it would have more HF on the type of horn in the Trio.
Edits: 04/01/14
The Avantgarde mid driver does not look like the Community M200s I have here.
There is a cover on the back, and the voice-coil top-chamber is a bit different.
The M200A is no longer available (as I think that was what Avantgarde uses)
The M200 requires a low-pass filter to remove the peak that the M200A top-chamber removed.
I have a photo montage from a magazine review on my hard-drive at home that shows the three drivers from the Trio, it's easy to see the M200A details.
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