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In the Forum: Horn-Loaded Speakers
In the Thread: Phase plug for midbass
Post Subject: Midbass followup IIPosted by ulf on: 9/30/2007
Dear Malinowski,

The basic idea for phase plugs is that the sound from all points of the diaphragm should  arrive to the throat at the same time. For the midbass horn we only used a simple one slit plug. If you feel up to it you could make a more elaborate plug with more slits.

If you want to lessen the HF extension just move the plug away from the diapragm. This will create a throat cavity that will act as a low pass filter. You can easily test different throat cavities in HornResp.

In reality you will get some more HF extension compared to what you see in the simulations due to the fact that we have cone breakup in real speakers.

The midbass is crossed at approximately  120 and 600Hz.

Listening to horn drivers without the horn?? Well, any driver (low Q, high Fs) that will be useful in a horn will sound rather thin. So you should not look for one with a good tonal balance. Try and focus on "thin but clean" instead. Cone drivers all have their individual character. Many of them gets really nasty in the higher frequenzies due to badly controlled breakups. Hook up the speakers with full range material and listen. If you hate the sound of the specific driver it is not likely to be helped by a horn.

If on the other hand, a speaker sounds thin in the bass region and rolled off in higher frequenzies, but still makes sense to listen to it is probaly a better choise.

At least you should be able to compare speakers with similar T/S and get a decent result.

Good luck with your horn! Ulf

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