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Multi-Way Conventional loudspeakers with crossovers

Short TL as Baffle Step Compensation
Short TL as Baffle Step Compensation
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Old 10th March 2008, 09:07 AM   #1
m@ is offline m@  United States
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Join Date: Nov 2004
Default Short TL as Baffle Step Compensation

I've seached through TL threads ad nauseum but excuse me if this has been covered before.

I'm currently designing a speaker with the Fostex FX120. Given the Q and Fs, this driver seems to go reasonably low in a standard BR enclosure.

However, given its relatively low sensitivity (for a Fostex) of 89 dB and low max output, I was hesitating to put a standard baffle step inductor on it.

My plan is to use these speakers with a sub crossed around 100hz. In a sealed box they roll off right around 100hz, but baffle step is still an issue.

Given that I don't need full extension, I was wondering if it would be possible to put these in a short (~ 100 hz) transmission line to give a few dB of rise to compensate the baffle step roll off.

I guess the theory here is that the driver output is nearly flat around 100 - 200 hz, where baffle step compensation is needed, so the added output from a short pipe would give a boost in this area.

Given that a TL can give a wide bandwidth increase in output, it seems this might be ideal if a high roll off can be tolerated.

I've modeled this briefly using Augspurger's software (modeled a 100hz pipe vs a 50hz pipe) and there does seem to be a few dB lift in the area where it's needed. It's hard to read his software, however, since it's innacurate for high frequencies (hard to establish a base line output).

In another month or two when I'm on holiday I'm going to cut some pipes and try it out, but I was wondering if anyone here had experimented with this in the past? Any reason it wouldn't work? Anything I should be aware of?

Thanks =)
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