how to determine a speaker efficiency? (1 Viewer)

[felix_suwarno]

Link Removed
how to determine vr965's efficiency? what would be a perfect receiver for that one? i dont want to use separate amps.
thx

 

[Selden Ball]

Felix,
More details are available about most Boston Acoustic speakers, including the VR965, in their "technical library" at Link Removed
Specifically, they claim it has a sensitivity of 90dB, so it'll work fine with just about any amp rating. (They mention 80W/channel.)

 

[felix_suwarno]

selden,

my receiver is a denon avr1802. rated "80 watts per channel into 8 ohms". and i paid only 370 bucks for it. i just found it hard to believe that such an expensive speakers would run just fine on a modest receiver.

and i found a few threads about people claiming the importance of having separated amps! i dont need to have the loudest sound system in the neighborhood, but off course i want the best i can get.

if a cheap receiver can drive vr965 without any problem, why would people buy 3000 dollar receiver?

thanks for the reply though

 

[Lewis Besze]

if a cheap receiver can drive vr965 without any problem, why would people buy 3000 dollar receiver?

'Cause last time I looked a receiver contains more then power amps?

Also just because an amp can drive a speaker,it doesn't mean others can't do a better "job"at it.

The watt rating isn't all the story here especially,manufacturer's figures.

And yes the VR-965 is considered a fairly easy "load".

 

[Brett DiMichele]

Felix,

If Bostons Specs are accurate which I am sure they are.

This means that the VR965 will output 90 Decibels of

Sound at 1 Amplifier Watt at 1 Meter. If your Receivers

specs are accurate (Being that it's Dennon I would say it

is accurate if not very close) You should be able to drive

these speakers at 100 Decibels with 80 true RMS Watts.

Why do people by High End Receivers and or Pre/Pro's and

Seperate amps? Simply for more features, More power and

cleaner music. With High End gear especialy Seperates you

have "Dedicated" boxes that allow room to generate power

cleanly and seperatly from the Source Switching and Signal

Processing.

Your Dennon is not a "slouch" in the performance area.

Dennon is known to make some very high mid end products

and I wouldn't consider any of the AVR Series to be "low Fi"

as you seem to be assuming.

There have been amplifier power charts relating to decibel

output posted recently on the forum. Decibel output is much

like top speed in a high performance car. You may be able

to get "most" cars to acheive 130 MHP Top Speed with the

proper aerodynamics and modest horsepower. But to go from

130 MPH to 200 MHP takes an almost 6 fold gain in horsepower.

The same can be applied to Decibels. Most systems that produce

at least 80 true full bandwidth RMS watts can drive a very

sensitive speaker (90DB or Higher) to a true 90 or even 100

Decibel level. But to make that same speaker cleanly output

130 decibels would take a 10 fold increase in wattage!

Make any sense?

 

[felix_suwarno]

thank you very much Brett.
Link Removed
thats my current system. my first ht, and i bought the sound system based on this forum's recommendation. the bostons are my dream system!
i have learned a lot from you guys. i also visit avsforum, but this forum is just better.

 

[Brett DiMichele]

Felix,

Glad I could be of assistance. That is after all what this

forum is all about. To share and to learn from others.

Your system looks great to me. Some people are too concerned

with dropping names and price tags. I don't feel those are

true enthusiasts. The true enthusiast is one of the first

people to help others and also the first to admit he is always

learning.

Great system and web page. Check mine out by clicking the

link below my signature if you want.