"Eiron"

For those of us with classic speakers designed in the vinyl days,
you probably need to keep the volume down when playing modern CDs
with smiley equalization lest you blow the tweeters.


** Fact - long before you "blow" your tweeters with some extreme signal -
your ears will be in great pain.

You warning is paranoid nonsense.



..... Phil

"Peter Larsen"

The standard KEF target efficiency was 10 watts to produce 96 dB at one
meter back then, my original KEF Coda's are spec'ed at 19 watts, I reckon
it takes their puny bass-range in account.


** Again, one is left wondering how KEF came up with that 19 watt figure.

Pink noise has a large peak to RMS ratio - about 14dB or 25 times power.

Did KEF have a 475 watt amplifier driving Coda with ( 20-20kHz ?) pink noise
?

Or did they cheat and let a much smaller amplifier clip the noise signal OR
did they just estimate the number from a test at lower power ?




..... Phil

Eiron wrote:
On 21/12/2013 03:58, gregz wrote:
"Dave Plowman (News)" wrote:
In article
,
gregz wrote:
The first thing is considering dB/ watt and system integration.

dB per watt isn't actually much of a worry in an active system.

Watts per mid and woofer ? Tells nothing.

Just attempting to give a rough guide on how much level the tweeter has to
handle. If that didn't matter they'd all be the same.


Then talk driver sensitivity.

You're not paying attention. It's an active design. Sensitivity doesn't matter.
Neither does phase if there's a decent overlap between frequency ranges of mid and tweeter.
And if you use a digital crossover with adjustable delay you can tweak it
according to whether the listener is sitting or standing.


Your going to have to figure power requirement of each range 1

Your going to have to know max SPL out at some power of each range 2

If if if 3

Greg