|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
65.96.137.241
In Reply to: RE: There is someting to this high powered amp approach posted by A.Wayne on February 02, 2016 at 14:31:35
But, the SCM-19 uses a 6" mid/bass driver (at over 9kgs). It has a good sized center that acts as a midrange driver. Most listening is done around 3 meters or so.BTW, this is one of the few speakers that provides the illusion that there is a live performance going on when in another room (especially piano).
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Edits: 02/02/16Follow Ups:
That driver is basically ATCs 3" mid with a cone glued to it.
Obviously the basket has been changed but the motor assembly (and therefore largely the weight) remains the same.
I am not surprised about the amps at all.
If you play them at 95dBspl average which is reasonably loud you are using 10W.
Now add in the 12-20dB of headroom needed to prevent the amps from sounding strained you would need an amp capable of 200-1000W. Lo and behold the two amps you tried which sounded best were the two which fell into that range.
It is all well and good talking about the quality of watts one is feeding ones speakers but if an amp clips even for short periods all its watts are c**p.
Who is playing at an AVERAGE of 95db?? Not many people I can assure you.
With classical music the average SPL level is probably more likely in the high 70s to low 80s db range with peaks then of 20 db or so. That puts you just over 100db rather than 115db...a big difference also in terms of the power needed.
The one real issue for a speaker like the ATC is the thermal compression as they are rather insensitive (probably lower than the 85db rating) and will start compressing rather early as the VCs heat up. So, it might really need a lot more power than theoretical to even get to 100db because you no longer get 3db for every doubling of the power...maybe only 2 or even 1 db as more and more goes to heat.
The higher the sentitivity of the speaker the higher the SPL level gets before serious compression starts...at least for conventional speakers.
Cab,
Take your avg RMS usage and multiply by 100 should keep you out of trouble ....
I do frequently but then I'm usually more than 1m away from the speakers.
Are you talking 95db at 1m or at the listening position? In a moderately sized room the drop is significantly less with distance than the point source theory. Regardless, even an 85db average is pretty loud...at the listening position, and most music is rather compressed so not so much headroom is necessary.
At 1m of course. What else?
My own speakers are 95dB/1W/1m and I regularly see the bass and/or lo-mid amp put out 10-20W.
Can't be that bad for you (I'm in my 50s and can still hear my supertweeter cutting in at 15kHz) and is a lot of fun neighbours or wife permitting.
I tend not to listen to over-compressed music.
I have 96db speakers and they work just fine with my 20 watt JJ 322 and play more than loud enough cleanly. My 35 watt Wall Audio monos are overkill really.
if your avg rms usage is .25 watt then yeah , a 20 watter will work .....
If you have 95db+ speakers then it will be more like 100mW for 85db at around 3 meters in a real room, which has a much smaller drop off than the free space theory.
The driver is 6" (ATC's mid is 3"). It does look as if they glued the 3" mid to the 6" driver. The speaker plays up to 108db max. It sounds very clean even when playing loud.
I was careful to match component values when re-doing the crossover. The non-inductive resistors and caps improve the performance markedly.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Yes it does but the other way around: They glued a cone to the dome and modified the basket accordingly whilst retaining the 3" VC and the motor assembly.
At least that is what ATC said they had done when they introduced that driver.
No argument regarding the capacitors but it is usually futile to change inductors.
The one advantage boutiquey inductors have is lower DC resistance however to ensure the crossover is working correctly one has to match the resistance of the new part with that of the one it replaces by adding resistors getting you straight back to square one albeit with a lighter wallet.
Hmmm, was not aware, thought they used a dome driver for midrange , my bad ....
They do use a dome for their 3 way speakers and being 3 " in diameter it has very good dispersion. It is also quite linear dynamically(doesn't compress much) and very open and detailed.
No worries.
They got a very high rating in Stereophile.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: