How critical is enclosure volume accuracy?

[Warrant]

I have decided to build my version of CJD's Garnacha with the interim working name of the Garnach... I'll wait until they're done to see if they warrant an A.
I am using 23/32 Araucoply and if one were to use the standard dimensions it would wind up a 1/16 short. I was also going to weight the bottom to reduce tipping, perhaps in a small plinth but just am curious as to the point of diminishing returns.
I apologize in advance as I have many, many more noob questions and would be grateful if only to be pointed to the appropriate thread.

Thanks

[numberoneoppa]

1/16th of an inch? Surely you can't be worried about that! Most of us can't even cut to a tolerance of 1/16th of an inch!

As far as adding weight to the bottom, you should be fine.

I've heard that +/- 10% leniency is usually allowed for internal volumes to achieve the intended sound of the design. A more important number is the baffle width.

[Amphiprion]

It is definitely not that critical. I would agree with 5-10% variation from design being OK. Unless you are measuring each driver individually, the driver T/S parameters could easily be off that much anyway.

However, don't go changing baffle dimensions by more than 1/8" or so. And that is honestly very tight, you could probably be off by more than that and it would sound fine. But if you want to stay true to the design, keep the baffle dimensions as close as possible.

[Warrant]

Ok, next question, is baffle width and baffle step compensation the same thing? And if so, how does this interact with the fact that I need to place them against the wall?

[Amphiprion]

Baffle step compensation depends heavily on baffle width as the baffle width determine the transition frequency from full space to half space (as well as other things like diffraction effects in the octaves above the transition frequency). Baffle step compensation also depends heavily on how close they are intended to be placed next to a wall. A speaker in the middle of a room needs much closer to 6dB or full baffle step compensation than a speaker placed directly against or close to a wall (which might need only 2dB).

If you need a speaker placed against the wall, start with a design that was intended for that or you'll have to modify the design.

[Warrant]

1/16th of an inch? Surely you can't be worried about that! Most of us can't even cut to a tolerance of 1/16th of an inch!

As far as adding weight to the bottom, you should be fine.

I've heard that +/- 10% leniency is usually allowed for internal volumes to achieve the intended sound of the design. A more important number is the baffle width.

I missed this on first time around.

One of my clients insists if I want to talk to him about wood I have to be able to split a 1/32 pencil mark...Yeah, I'm working on it. He's a journeyman carpenter, cabinetmaker, electrician, and high end homebuilder. He gives me something to shoot for.

[Warrant]

Baffle step compensation depends heavily on baffle width as the baffle width determine the transition frequency from full space to half space (as well as other things like diffraction effects in the octaves above the transition frequency). Baffle step compensation also depends heavily on how close they are intended to be placed next to a wall. A speaker in the middle of a room needs much closer to 6dB or full baffle step compensation than a speaker placed directly against or close to a wall (which might need only 2dB).

If you need a speaker placed against the wall, start with a design that was intended for that or you'll have to modify the design.

I'm hoping CJD will jump in here and say they will work great against the wall or change x to make them work. I hate being ignorant but I'm also learning as fast as I can.

[cjd]

You can lose a very little bit of BSC by using 20ga inductors, but that messes with tuning a little also - more than 1/16" dimensional change will.

If you can keep them even 10cm from the wall you should be OK, I suspect.

[Warrant]

You can lose a very little bit of BSC by using 20ga inductors, but that messes with tuning a little also - more than 1/16" dimensional change will.

If you can keep them even 10cm from the wall you should be OK, I suspect.

10 cm is doable I'd kiss ya but you're built funny

Is it too much to ask for dimensional drawings? A quick sketch of the baffle, with numbers...placement of the bracing.

I going to keep the volume the same but I'm going to double the baffle to use some bookmatched birdseye maple that has me drooling.


Thanks

[cjd]

Is it too much to ask for dimensional drawings? A quick sketch of the baffle, with numbers...placement of the bracing.

No, not too much to ask, certainly.

I have to find a program to use for that again though.

[Warrant]

Thanks,

I'm chomping at the bit and an Abouriou for the center.

woohooo.

[cjd]

Khan-center will be a good match too.

[Warrant]

Its one of those days...

So yesterday I i felt overly ambitious and cut the wood for my Garnachs and the Abouriou when I realized I hadn't measured the space i had for the center speaker. I grab the tape measure and boom. seven inches,!@#$#@#$%$#$E%^&^%$#@.

So, a question or two, if I keep the baffle the correct size and alter the box dimensions (depth) to retain approximately ( ) the correct volume will it in theory function as intended?

Part two, is there an advantage to tilting the baffle as the center is 15 inches off the floor?

[---k---]

Its one of those days...

So yesterday I i felt overly ambitious and cut the wood for my Garnachs and the Abouriou

I must have missed the Abouriou thread and can't seem to find it. Is CJD hiding something from us?

[Bent]

Abouriou, according to Eldamar

[Warrant]

Abouriou, according to Eldamar

Hey stealing my tiny thunder, :P Have you stopped glowing yet?

[cjd]

Assuming you are building the center sealed, volume will be fine at 7in.

Tilting maybe but should be a minor change in response.

[Warrant]

Thanks.

[---k---]

Abouriou, according to Eldamar

Ahh, he finally gave it a real name. I see he also gave the big ones a name too. About time.

[Silver1omo]

I'm not trying to hijack... But, are the unshielded RS150 ok for the Abourio? The ported towers look interesting...

[Bent]

Hey stealing my tiny thunder, Have you stopped glowing yet?

Nope, Just watched Team Canada in the Juniors'