ISO Cabs

monquixote

I'm looking for an ISO cab, but I want a full range speaker in it rather than a guitar one (It's for testing microphones rather than recording guitar)

Anyone know a maker that lets you pick the driver?

Dodge

No, but is the Jet City one is cheap enough to buy and change the speaker?

photek

Worth seeing if you can find the Jet City ISO 2 so you have 2 mic's at once. I quite fancy one for home recording to be honest.

Koa

Got all excited there thinking there was a new international standard for speaker cabs , possibly ISO4x12:100w......just me then...

Cabicular

won't you need a tweeter for FR?

digitalscream

Cabicular said:

won't you need a tweeter for FR?

This is the immediate problem. I don't know of any PA driver which will get close to where average human hearing tops out, much less the 20kHz upper limit of tweeters. Even if you decide to put a tweeter in there, you're going to have some serious problems with sound distribution between the main driver and the tweeter vs mic positioning.

Perhaps a bit more info on what you mean by "testing mics" might be helpful...?

monquixote

digitalscream said:

Cabicular said:

won't you need a tweeter for FR?

This is the immediate problem. I don't know of any PA driver which will get close to where average human hearing tops out, much less the 20kHz upper limit of tweeters. Even if you decide to put a tweeter in there, you're going to have some serious problems with sound distribution between the main driver and the tweeter vs mic positioning.

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.

SickSquid

Demeter's ISO cab comes unloaded. I sold one on here a couple of years ago.
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.

ToneControl

monquixote said:

I'm looking for an ISO cab, but I want a full range speaker in it rather than a guitar one (It's for testing microphones rather than recording guitar)

Anyone know a maker that lets you pick the driver?

I have one for sale, it was custom made
you can use a monitor cab inside it

Cabicular

SickSquid said:

Demeter's ISO cab comes unloaded. I sold one on here a couple of years ago.
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.

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)

maltingsaudio

monquixote said:

digitalscream said:

Cabicular said:

won't you need a tweeter for FR?

This is the immediate problem. I don't know of any PA driver which will get close to where average human hearing tops out, much less the 20kHz upper limit of tweeters. Even if you decide to put a tweeter in there, you're going to have some serious problems with sound distribution between the main driver and the tweeter vs mic positioning.

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.

Something like the dual concentric in an AER would be best in my opinion for what your doing it's an 8" Beyma  and fairly linear in response. The carpentry is up to you 

Drew_TNBD

If you're testing mics, you don't want to use an ISO cab. It will influence your results too much.

monquixote

Drew_TNBD said:

If you're testing mics, you don't want to use an ISO cab. It will influence your results too much.

Why do you say that?

Cabicular

monquixote said:

Drew_TNBD said:

If you're testing mics, you don't want to use an ISO cab. It will influence your results too much.

Why do you say that?

Iso cabs add their own sound 
You need to engineer it out when you use the tracks

Drew_TNBD

monquixote said:

Drew_TNBD said:

If you're testing mics, you don't want to use an ISO cab. It will influence your results too much.

Why do you say that?

Small enclosed spaces will cause resonances and comb filtering that the microphone will pickup, meaning huge boosts in certain frequency areas and huge cuts in others. You wont get an accurate measurement of the microphone for this reason.

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.

guitarfishbay

Drew_TNBD said:

monquixote said:

Drew_TNBD said:

If you're testing mics, you don't want to use an ISO cab. It will influence your results too much.

Why do you say that?

Small enclosed spaces will cause resonances and comb filtering that the microphone will pickup, meaning huge boosts in certain frequency areas and huge cuts in others. You wont get an accurate measurement of the microphone for this reason.

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.

ThorpyFX

I have a JETCITY one for sale £150 Mint condition as new. It is being sold due to a lack of space. the gear room upstairs is turning into a nursery!

monquixote

Drew_TNBD said:

monquixote said:

Drew_TNBD said:

If you're testing mics, you don't want to use an ISO cab. It will influence your results too much.

Why do you say that?

Small enclosed spaces will cause resonances and comb filtering that the microphone will pickup, meaning huge boosts in certain frequency areas and huge cuts in others. You wont get an accurate measurement of the microphone for this reason.

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.

That's no use then

monquixote

guitarfishbay said:

Drew_TNBD said:

monquixote said:

Drew_TNBD said:

If you're testing mics, you don't want to use an ISO cab. It will influence your results too much.

Why do you say that?

Small enclosed spaces will cause resonances and comb filtering that the microphone will pickup, meaning huge boosts in certain frequency areas and huge cuts in others. You wont get an accurate measurement of the microphone for this reason.

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.

Using a studio room at the moment but it costs money and requires arranging.

ToneControl

monquixote said:

guitarfishbay said:

Drew_TNBD said:

monquixote said:

Drew_TNBD said:

If you're testing mics, you don't want to use an ISO cab. It will influence your results too much.

Why do you say that?

Small enclosed spaces will cause resonances and comb filtering that the microphone will pickup, meaning huge boosts in certain frequency areas and huge cuts in others. You wont get an accurate measurement of the microphone for this reason.

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.

Using a studio room at the moment but it costs money and requires arranging.

you could use an empty field - the ultimate anechoic chamber
you can average out to cancel out any background noises

monquixote

ToneControl said:

monquixote said:

guitarfishbay said:

Drew_TNBD said:

monquixote said:

Drew_TNBD said:

If you're testing mics, you don't want to use an ISO cab. It will influence your results too much.

Why do you say that?

Small enclosed spaces will cause resonances and comb filtering that the microphone will pickup, meaning huge boosts in certain frequency areas and huge cuts in others. You wont get an accurate measurement of the microphone for this reason.

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.

Using a studio room at the moment but it costs money and requires arranging.

you could use an empty field - the ultimate anechoic chamber
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!