Woofer Assisted Wideband. Typically a FR supported by helper woofers with XO in the 200-500 Hz range.
dave
Yes, you are correct...I highlighted that possibility to reach down that far to show that particulars drivers flexibility.
For your noted outside "party" application, running a pair of these in the "recommended" volume of seventy-one liters...a slim tall enclosure to get off the ground should get you the accuracy & SPL levels just fine. Roll off the pair at 80 hertz & let a subwoofer do the lows..
-------------------------------------------------------------------------------------------------------------------------------------------------------Rick...
Hate to disagree but 13 watts would barely touch 102 dB
and up to full power at 40 watts. Excluding power compression
Barely touch 108 dB. Below 100 Hz close to smacking the magnet.
As posted 45 to 65 watt HiFi drivers are what they are.
pretty much ran numerous drivers. between 91 and 94 dB
GM is usually pretty close if not dead accurate with his numbers.
And the suggested hints are more than realistic.
Thermal rating or just the basic power rating of the driver.
How much heat it is designed for.
Most drivers include power rating.
Usually you hit Xmax or 10% distortion way before you worry
about exceeding the power rating or thermal rating.
Drivers get very hot around 130c to 180c
So if a manufacture rates them around 45 to 65 watts.
Assume normal HiFi driver, aluminum former, copper wiring.
Maybe some extra venting to get up around 65 to 85 watts.
Mainly the glue for copper windings that give up and windings swell.
So you get " rubbing" and kill the driver.
When you get up to live sound drivers, you might see higher temp glues
kapton formers ext ext, vented magnets. basically heat range can go up to 150 to 250 watts.
Very generalized all drivers are different. But the manufacture should state the power rating.
If well done, usually a 2 hour test and they destroy the driver to find thermal rating.
So if they say 45 to 65 watts. I would consider that good.
Specially if a driver is assumed under continues heat. like 5 to 8hrs of constant music.
Usually not a concern, with vented enclosures at home.
Vented enclosures in the bass region will start to distort.
So usually you wont exceed the power rating.
Once your shooting for more Sound pressure levels. And start using sealed enclosures.
And or using a highpass filters to remove bass distortion.
Then it is usually possible to apply more power without hitting distortion.
And then you can actually exceed the power rating or thermal rating.
common case is " midbass" for live sound on 60 - 80 Hz.
Can take lots of power with low distortion. Ive murdered many 15" or 12"
drivers. Not much distortion. But killed them with high power/ high heat.
Maybe comment makes sense, I tested wide range of common HiFi 8"
on a highpass filter. Non of them really hit Xmax not much distortion.
So it would be somewhat easy to drive them way past 45 to 65 watts
and exceed thermal rating. And as said about 105 to 111 dB at the thermal
rating. max power. Start getting friendly with volume knob, not much distortion.
then = Poof
Why 2x drivers was recommended with 65 watt drivers, for more thermal or power.
Or also mentioned was live sound drivers. Which have higher thermal around 150 to 250 watts
in the 8" range. Ironically usually sensitivity and xmax about the same as some Hi Fi
wideband. 1.5 to 4mm xmax and 92 to 95 dB. But the low 45 to 65 watt thermal rating for HiFi
is the concern. I think your music levels aren't club level, but it was part of GMs suggestions.
And why I tossed out generalized Sound pressure levels with 45 to 65 watt drivers.
Where your close to being ok, but be safer than sorry, or be careful, because filters
get rid of a lot of distortion, and many times common sense dont work. You dont hear
distortion, and keep pushing until the heat kills them.
Change Ang setting from 1 Pi (quarter space) to 4 Pi (free space).
Check driver parameter values. Qms = 10.10 seems rather large.
Attachments
Thank you, David.
Changing to free space does lower the output quite a bit.
And Qms 10.10 is what the specs say.
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Just checked - seems that it must be correct then...
