Low-Range Frequencies!

[billfitzmaurice]

The Acme and Eminence BP102 would both benefit from a large box of 3~5 cubic feet per driver to reach full bottom. Both drivers are pretty close in spec.

No surprise there, safe to assume the one is an OEM variant of the other.

Im not saying that it's wrong to chekc and study specs. I just feel that by just plugging in to some amps and cabs will give you mor e insight about what will work for you, than 500 pages of specs.

OTOH, wouldn't you hate to order a cab based on false specs and find out they were false the hard way? Based on your location you should be acutely aware that not everyone has the luxury of being able to try before they buy.

 

[alexclaber]

I have the Acme B-series driver in my spread sheet, data provided by a TB member. Assuming it is accurate, this driver is acoustically large, with Vas=98L, Fs=36, Qts=0.45, CalculatedSPL=92.

The Acme and Eminence BP102 would both benefit from a large box of 3~5 cubic feet per driver to reach full bottom. Both drivers are pretty close in spec.

That doesn't ring true with my knowledge of Acmes. The calculated SPL is lower and the speaker gets full bottom in a smaller enclosure, I presume due to higher Mms and Cms. A standard BP102 wouldn't get close to -6dB @ 31Hz in such a small low-tuned enclosure.

Alex

 

[JAUQO III-X]

Just get enough amp power and a good cab setup and you'll be good to go. Some cabs are better thna others but I think a nice 410 a powerful amp and most importantly a good bass with a good 5th to start with is more important than specs.

 

[bottomzone]

Or not. What's more likely is that Acme rates its sensitivity in a more honest fashion. Acme uses drivers with a nominal 90dB sensitivity rating. Most other manufacturers use drivers which have far higher sensitivity ratings. However, those ratings are usually measured at 1kHz or higher; in some cases the frequency of the quoted sensitivity might be as high as 3kHz. But down where it really counts, below 100 Hz, all drivers are about the same. While the Acme cabs may well be as much as 15dB less sensitive in the midrange, they aren't significantly less sensitive in the low end than anyone else's direct radiator cabs. What's far more significant than a sensitivity rating quoted at a nonsensical frequency as far as bass goes is the displacement limited output capability of the driver. Here a long throw driver like what Acme uses has far more output capability, while other specs, such as a lower fs, which are responsible for the lower midrange sensitivity, also allow them to work to lower frequencies than the typical OEM driver.

How do Euphonic Audio cabinets measure up? (pardon the pun )


Keep God First!

A Groove is a Terrible Thing to Waste!

 

[bgavin]

That doesn't ring true with my knowledge of Acmes.

My data for the Acme driver came from a TB member. I've not played an Acme, nor measured one.

Using the data provided, the alleged Acme driver and BP102 are very similar. Both have been in the spread sheet for some time now, so holders of older copies have that data.

 

[billfitzmaurice]

How do Euphonic Audio cabinets measure up? (pardon the pun )

Since they, along with every other manufacturer save Phil Jones, don't publish SPL charts it's impossible to say, though if you send me one I'll be happy to measure it.
My assumption is that Acme's specs are reasonably accurate, since there's nothing about them that sends up any red flags. As for the ones who blatently play fast and loose with facts, it's pretty much common knowledge who they are.