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Perhaps a bit more info on what you mean by "testing mics" might be helpful...?
Ideally I wouldn't want a 12" speaker (which is all the more reason not to replace the driver in an existing ISO cab), but I could get something like a Celestion FTX1225 which goes up to 20k
It's actually not that big a deal if I don't have up to 20k as there is not a huge amount of energy up there and it's not really important for what I'm doing.
The application is "work stuff" so I can't go into too much detail, but essentially testing the performance of relatively low end consumer microphones at various sound pressure levels.
If you could persuade Rivera to supply their Silent Sister unloaded it may be a great option.
I say that as they need some way for the sound to be dispersed from inside such a small enclosure, which that one does. Either that, or make your own around a traditional cabinet using sound deadening materials. I ended up doing that and it sounds better than anything else I've used.
you can use a monitor cab inside it
I'm pretty sure I bought that and have it in storage somewhere
If you are interested PM me and I could look it out for much cheapness (It's probably costing me more to store than it is worth)
You need to engineer it out when you use the tracks
Even if they're treated this is true, because the treatment used in those boxes is usually low density foam which doesn't work well for bass frequencies.
Exactly this.
Treating bass frequencies purely with absorption takes a lot of space, and isn't possible in a typical ISO box. Put simply they will sound boxy and not be representative of flat.
A better solution (though I have no idea if financially viable in this scenario) may be to look for your closest academic facility with an anechoic chamber.
That's no use then
Using a studio room at the moment but it costs money and requires arranging.
you can average out to cancel out any background noises
It's quite a long test so it gets done overnight.
I'm not sure my kit would still be there!