JF Vented Horn (P-audio E18-600a)

I dont understand, how would that work?

ceharden wrote: Since both sides of the driver are effectively vented to the outside it doesn't matter which way round you put the driver in terms of heat. Oh and you don't actually need airflow as such, vibrating air can also transfer the heat just as well. One of my mates did a project at uni using speakers playing tones to cool heatsinks rather than fans!

Yeah, i cant wait to find out what happens either! It'll be a few weeks yet though because i need to get a proccessor and an amp & ply (str3000 & ultradrive) so i need ~£700 first, unless i can get some friends to go in on an amp with me?

• an alright amp (1000w RMS into 8ohms)
• an ultradrive
• a spare day
• lives in Norfolk area

I might put a message in the wanted section nearer the time, or at least when the cab is built.

That looks like the sort of plot I want.

How big is this box DJK? Any hint of a manufacturer or box model?

Stu

Back to the heat,
if for example you were to lay a HD15 type box  on it's side (with the magnet in the throat chamber), as the magnet gets hot the air will rise past it as it warms up and more will be drawn in from below. The warmed air will then travel along the top of the box and a good portion of it will go out of the box, fresh cool air will be drawn in from below.
If the magnet is in the rear chamber with a long port then I don't think this effect will be nearly as effective.

As far as drivers in sealed chambers are concerned I put some 15XB's in some Martin115's that had previously been in some bandpass boxes and ran them with a smaller amp than had been used with th BP boxes (same model just a lower power version) and burnt out the VC's on the drivers during the first nights use, they had been in the BP's for years (with bangin SP23 techno), also speaking to one of the designers at Fane he said you will not get the advertised power handling by a wide margin if you stick the speakers in small sealed chambers.
For the use you have mentioned ie heavily compressed bangin techno all nighters then sealed rear chambers or poorly vented ones are going to start limiting your output due to power compression and reduced long term thermal power handling.

JaKe


Edited by JaKe - 07 April 2008 at 3:38pm

Vibrating are I would think will aid in cooling but the heat will stay in the box and so the air will just get hotter and become less effective with time.
Withe the magnet in the throat chamber you have a much bigger and expanding opening which will allow for the convection cooling more effectively.

JaKe