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In the Forum: Horn-Loaded Speakers
In the Thread: Mitigating Undesired High Freqs in Midbass Horns
Post Subject: It is all depends….Posted by Romy the Cat on: 6/30/2010
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There are a few other ways to roll off HF: shaping and extending front chamber, playing with damping of the driver cone and so in. The Altec 515G at 220H, what the channel above? When you say that you have too much HF then how do you methodologically conclude 300Hz is better to be reproduced from lower MF Chenal?
Anyhow, the off axis is fine method but it helps only in very with a few dBs. Also, if you toe off your midbass horns then the sides of your room need to deal with that HF.
The HF absorbing material is a bit complicated as to control the absorbing rate is very difficult. I think the combination of off axis with absorbing is more promising. Still, the absorbing not ONLY rolls off the HF but do a lot of other things (overtone and harmonics). So, you need to be VERY accurate what you do with absorbing. I use to use absorbers in mouth before but I feel that if I can then I would not do it as it is very hard to mange.
Higher order low pass crossover or moving the crossover to the left is the most controlled way to do the thing. It all about the degree. You can get a bit from crossover, a bit from off axising and so on. Do not forget that off axising midbass horn you minimize the listening spot…
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