In a Dolby Atmos application, specs call for an F6 @ 40hz for the front mains and centre. So if I was to use those speakers I shared pics of in this application, this is how I would tune the DSP to meet those specs. In this simulation the Purifi 6.5 is in 4L, and the F3 is @ 51hz and F6 @ 40hz. Much more SPL is possible at 200w peak in this configuration. In a 12L cabinet without boost the F3 is 85hz, and F6 is 55hz. Doesn't meet Atmos specs without boost in 12L sealed cabinet.
Here's the 6.5" in a 12l sealed without boost. F3 85hz, F6 55hz. This is about max I would run it at.
You aren't wrong but what that long term output would be in a practical sense is harder to say because it would be program and use dependent.
Most of the power in the simulations above was being put in where there is very little musical content so for many use cases there may actually not be that much power being put in on a continuous basis.
If you were to try and play 10Hz test tones at PA volume then you would find the limit pretty quickly.
Yes thats a good point. Since most music has no content under 30hz, lets have a look at the 6.5 in 4L, tuned to an F3 of 30hz, with an excursion of 12mm @ 30hz. Note that even under these extreme conditions, the voice coil is only seeing 166W @ 30hz. Far under the rated long term power of 250W. So I think it's safe to say that you will bottom this woofer out with any music, before you reach the thermal limits in a 4L cabinet, with enough boost to bring the F3 to 30hz. Which is why they engineered this driver to have a beefy 4 layer voice coil.
That wasn't what I meant, it seems to be odd in that it goes up with increasing voltage, when it shouldn't be plotted at all if there is no port.
So have to ask.
A 4L box with DSP low shelf filter and lots of power you can get down to 30hz with decent distorsion?
It sounds to easy must be draw backs.
A 4L box with DSP low shelf filter and lots of power you can get down to 30hz with decent distorsion?
It sounds to easy must be draw backs.
Yes you need more power. And the maximum SPL decreases. The simulations clearly show this. When you buy a high performance woofer, one of the advantages is it can handle this. If you don’t take advantage of what the driver can do, you’re kinda wasting it IMO.
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It appears that the velocity windows is showing the cone velocity when a sealed cabinet configuration is chosen. From the manual:
- Air velocity [m/s] of vents. Turbulence warning 17.2 m/s (5% mach) and alarm 34.4 m/s (10% mach) for vents. Velocity [m/s] of cones and passive radiators.
Distortion and compression due to rising Kms and dropping Bl. Purifi as Erin measured is fairly linear to around 7mm excursion.
Soon stereo just isn’t gonna cut it to be considered high end audio. I suppose after 90 years this is a welcome advancement.
https://www.futuresource-consulting...dio-megatrends-for-2022-tech-perspectives.pdf
https://www.futuresource-consulting...dio-megatrends-for-2022-tech-perspectives.pdf
Adude’a approach is interesting just like Devialet Phantom you just crank up the amps to 11 and put it in the smallest box because the market buys it.
1000W into 1L cabinet no problemo.
Where are these studies that says distortion doesn’t matter?
I’d like to see what transducers they were using, and what was their comparison/reference ultra LD driver and amplifier?
time to do more studies advance the science…
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Pseudo stereo or Mono is where it’s at; if you look at 95% of the consumer buying market with their good enough bluetooth battery speaker.
It’s also the way to get the best quality sound possible from the drivers. I do it because of the best sound. The small size is just a bonus.