FSP15-BPH: HD15 upto 200Hz

There is a HD15 threadon SP, detailing lots of hornresp sims for differing drivers, and according those, HD15 will effortlessly do 60-200Hz with PD 1550, and few other drivers.

However many still prefer ES18-BPH/USB.

Do you think we could come up with an FSP15-BPH, that is all the HD15 is, + all that it isnt?

I guess it will just be a free version of the ruler... A.S.S BS600/BS1200..
Edited by: levyte357

there is a descussion over on SP regarding the same subject. The HD15 was compared with the old turbosound 15" bph which as we know can play upto 250hz. the main difference noted is the size of the rear chamber, on the turbo cab it is larger. Edited by: Static Age

Static Age wrote: there is a descussion over on SP regarding the same subject. The HD15 was compared with the old turbosound 15" bph which as we know can play upto 250hz. the main difference noted is the size of the rear chamber, on the turbo cab it is larger.

I would imagine one of the reasons the old turbosound 15BPH/BS600 are so large is to allow them to play low.

If the emphasis is more on 70-200, would shorter horn/smaller rear chamber be the idea?

thats what you would think but it doesnt seem to be the case. both the Turbosound 15" & the ES18-BPH play up higherthan the HD yet are larger cabs.

the chamber on the HD15 is very small, as anyone who has tried fit drivers in will tell you.

so whats the science on BPH's, what makes some designs play higher than others, is the hole rear chamber size the opposite to the 'normal' way of thinking?

excuse my ignorance Tek but is the BS600 a band passhorn or a folded horn?

levyte357 wrote: <div>I guess it will just be a free version of the ruler... A.S.S BS600/BS1200..

</div>
<div></div>

That's not a bandpass horn though. From Tony's pics it doesn't look massively dissimilar to this (it's a pdf dload) plan from selenium except Tony has the v wedge thing to even the driver stress.

Although i have hornresp i can't actually use it [img]smileys/smiley18.gif[/img] anyone care to post the box parameters as a start point.

And about the plots on the hd15 page- does the spl response tell you how it actually sounds? I thought it was just a honky box above 160 whatever the driver.

Boycey wrote: Although i have hornresp i can't actually use it [img]smileys/smiley18.gif[/img] anyone care to post the box parameters as a start point.

I tried clicking on the box parameters jpg on the HD15 sim thread, and something with porn bannersappeared on my screen, very convenient at work.
Maybe the parameters were on it, but couldnt risk that on my screen period.

Boycey wrote: And about the plots on the hd15 page- does the spl response tell you how it actually sounds? I thought it was just a honky box above 160 whatever the driver.

By all accounts, HD15 will play up to 180Hz fine, If we can get it honkless up to 220hz, I'm sure most 10"/12" Mid tops can cope from there upwards.

whats with the desire to get the low mid so high? by all accounts that'll only muddy up your low vocals kick tends to be 160-150 at the top as far as i know and if you've got a good mid top wit half decent power handeling it should strech that low without over excursing and sound nicer

sorry lev- i meant the box parameters from the selenium bin (no porn there[img]smileys/smiley2.gif[/img]). i reckon that'd be a better starting point for a FSP115 kick bin than the hd15.

why push the xover up? er because the kick drum still has a lot of fundamental stuff going on up to the mid 200's. also this allows a smaller format mid range device therefore allowing a crossover from mid to heigh that isnt right in the middle of the vocal range, and meaning the tops arnt actualy playing upper mid and top.

mid 200s? you learn something new everyday., though vocals through a folded horn will get all muddied up no two ways about that like everything its a compromise depending on your specific need and how the cab sounds doing it