Building a set of PA speakers, any help appreciated.

[pinkmouse]

Sreten

Power handling; True, and as I said, I know that Audax are very conservative.

Robustness; Also true to acertain extent.

My main problem I think is that I spent to much time on the road, and so I am used to kit needing to be built to handle the abuse of a herd of rampaging buffalo, (or Teamsters, as they are otherwise known) ...

[5th element]

Aha! I just realised what your wedges are all about! your talk about the horn being the wrong way around.

Either way the ideas I come come up with are shown in the pic below. I like the 3rd design over the others with regards to dispersion from the horn, xover design and speaker stability! we dont want any speakers falling over now do we.

Also I suppose if my uncle found out that he was going to require more SPL I could always make another and they could be stacked on top of each other. Obviosly I would make them more square the the pic shows if this was the case.

[pinkmouse]

Design choice of version two or three really depends on crossover frequency and the size of the horn, if the MTM arrangement has the drivers too far apart you will get beaming problems...

[sreten]

Originally posted by 5th element
I am also interested in sretens idea too, that sounds like it would sound much better with jazz. What was the idea to do a line array with horn to the side running vertically like a ribbon would?
The nice thing about the audax units is they are cheap. Using vifa's or peerless drivers would cost a whole heap more.

I haven't really thought about the treble units too much,
thought I'd run the bass units through as an idea first.

As said a vertical horn is not a good idea.

Unfortunately I don't have source as good value as the Audax's.

sreten.

[5th element]

Yes I suppose your right in that two might be a better option. If the drivers wired in series parallel to give 6 ohms gives about 98dB factor into it BSC, which would probably need the full 6dB whack as the speakers are more then likely gonna be put in free space, and I've got 92dB. Thats not a bad figure but I'd rather keep it above 95 or closer to 100. Damned high sensativity projects always getting complicated. Any other ideas of high sensativity drivers? IM currently looking..

[sreten]

The same thing happens if you factor in BSC for PA drivers and EQ out the midrange boost.

The obvious choice in line level BSC, or for PA drivers turning up the bass.

Without BSC the Audax's will still be relatively very good for Jazz.

sreten.

[sreten]

An option is to use an angled front with an MTM either side.

sreten.

[5th element]

I suppose 3dB or even switchable BSC could be an option too. I just dont want to make something thats not gonna cut it.

Erring on the side of safety two 10" PA in a TMM would be more robust, but they only have tiny tiny xmax so would probably develop the same SPL as the audax before distorting.

A pair of audax though is nice and cheap so i suppose if it does fail then theres not much lost, but its not my money. If it was I'd be more then happy to go with the audax.

Having had a look at a few other web sites proper high eff drivers dont come cheap. Beyma make some very nice highish xmax 10" drivers that would make a bril TMM but they are expensive, I like the look of the 10G40 but one driver would cost the same as all 8 audax. I dont know either if this is a good sounding driver.

[5th element]

Originally posted by sreten
An option is to use an angled front with an MTM either side.

sreten.

I take it by this you mean two four driver MTM's per side of the angle. So you would get more sensativity, but this would give overall impedance as 3 ohms, might not be too healthy.

[SineEra]

My preference would be for a 12" and say 2x6" xover at <350Hz. Taking the bass out of the drivers that do the mids always helps.
Typically Fane Cres12MB or Celestion C12.300b,
http://www.bkelec.com/
and NB62S eminence from Maplin.
Perhaps using the KSN1177A twin Piezo horns from Maplins ( remembering the resistor ) at around 2.5Khz.

What type of bass is it double or electric, either way they could have a 1 x 15" amp just for them to reinforce the bottom end for larger halls/higher vol.

Happy hunting

Simon