186 horn in Hornresp

Well I don't think your simulated response is that far of.

Best regards,

Walt

Okay, here's my attempt. It's still not quite right. I've tried playing about with where the segments start and end but I'm bored now!

I drew the whole thing in AutoCAD so I could work things out more easily. The throat chamber includes an allowance of 3 litres for the driver cone and the rear chamber includes an allowance of 7 litres for the driver and a bit for the back panel (to round it to the nearest litre).

Here's how I split it up:




Here are the Hornresp parameters for the standard 600mm wide version:




And here are the parameters for my 500mm wide version:




And finally, here are the plots. Black is 500mm, grey is 600mm:




Edited by Wrighty - 03 July 2007 at 12:18pm

Storage space mainly. At the moment, I've got a pair of PD186 loaded T18 clones and although they did sound awesome at the Summer Solstice gig I did, I think I can do better.

550mm is the absolute max cabinet width I can get away with. Reducing the 186 horn by 100mm brings the total cab width down to 536mm. Allowing for hardware protrusions and/or covers, this is perfect. Coincidentally, this is the width that my 15" reflex subs will be when I get round to rebuilding them, so they'll sit nicely on top as low-mids.

The other option I was looking at was a pair of Punishers, but I already have a couple of PD186 drivers in the T18s, so thought I'd save money by recycling those.

Also, I'm not fully converted to the thought of being able to bung 2500W of Crown into a pair of 12" drivers and not see smoke. I like the 5 inch voice coil of the PD186. I like the PD186's 97dB efficiency, compared to the Ciare's 91dB. I can see the reason for using a 12" driver because it offers advantages from the point of view of the horn design, but there's gotta be a catch!

Ok, nice one! I've been playing about with some figures in Hornresp too, but I was looking for an easy option so I don't end up having to build loads of prototypes. I'm sure the bloke in B&Q hates me. He never seems terribly impressed when I go over to the panel saw with a couple of sheets of ply and a cutting plan...

I'm awaiting Ginger's plan too. In the mean time, I came up with this:





If I can work out how to fold that up in a box, I'd be quite happy with that. The 4000cm^2 mouth equates to 500mm wide, 800mm high front of cab (internal).

I did think about whether it was possible to make the 186 deeper and taller to compensate but it requires a fair amount of calculation and even then, may not be quite right.


Edited by Wrighty - 11 July 2007 at 3:50pm

I managed to come up with something pretty damn close to that exponential model, using 4 conical segments but it was just a case of plugging numbers in until I got a schematic and a graph which looked similar. I've come to the conclusion that folding horns requires a lot of patience.