large baffles without BSC

[el`Ol]

Hello all!

Having played with Edge and seen the room gain curve in the Basta tutorial I ask myself whether a broad speaker with driver mounted at the edge (for avoiding the bump) would get along without baffle step correction. Has this worked for anybody, and if so, why are spekers so slim in general? Only WAF?

[Norcad]

It still needs BSC. Even if the baffle has a with of 60cm, there will be a Baffle Step Loss of -3dB at about 150Hz.
To avoid baffle step you must put the driver in the wall.

A slim speaker is better when it comes to sound staging, it will in general have a wither and deeper sound stage.

Like Troels Gravesen says about his wide baffle speaker; "It comes with a room"

[el`Ol]

Edge says -3dB at 100Hz,
Basta documentation says +3dB room gain at 80Hz.

[auplater]

Baffle step and room gain all arise out of gemotric properties... baffle step due to the transition in driver radiation patterns (and wave cancellation) and room gain dependent on room dimensions, standing waves, etc.

Baffle step is indepent of room gain as far as the driver is concerned.

John L.

[el`Ol]

Even people who build slim speakers never do full 6dB BSC, so room gain isn´t ignored by them, either.

[Norcad]

I agree, yoy cant ignore room gain.
I think Edge is a little optimistic.
Have you tried Baffle Step Simulator, an Excel application.
I have used it on a couple of DIY, and it seems to be accurate, even with different edges on the cabinet. Its fun to play around with.

[BHTX]

Originally posted by Norcad
Have you tried Baffle Step Simulator, an Excel application.

Have a link? I could have sworn I already had that simulator, but I guess not.

[auplater]

Well, as far as compensating bsc with room gain, I'd be pretty wary (which is what the orig. question seemed to imply)

Two separate issues... baffle step is a function of the driver vs. baffle dimensions only, not variable or dependent on room size or shape.

Room gain is highly variable in practice, dependent on modes, angles room size, speaker position, etc. Not to be ignored, but using room gain to correct baffle step in practice is gonna produce a pretty lumpy response in the real world, even if it looks good on paper with a specific set of conditions for the room...

I think you'll be dissapointed in practice if you rely too much on sims...

[Norcad]

BSC and room gain are two different issues, yes. But that doesnt mean that you can forget one of them.
Because of room gain and room modes, it will produce a lumpy freq resp, but it will not be any better if you forget the room gain and make a full 6dB BSC?
Actually I think it will be worse.......

Many simulations can produce rather accurate results. It all depends on the input data, and to understand the purpose of the simulation.
Like when you simulate a bass enclosure, it gives you a theoretical respons, that you never will see indoors.
With Baffle Diffraction Simulator, I have testet 7 totally different loudspeaker designs, and I'm amased of the simulated result.
In the whole freq spectrum it gives a pretty good picture of what will happen.
Even with xo's, you can simulate a very good result, the problem is that the input data very often is wrong

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