Measuring horns - jeff mai - High Efficiency Speaker Asylum

Measuring horns

Posted by jeff mai (A) on February 5, 2007 at 03:55:41

I've got some large midrange horns here that I'm measuring. I'm finding that an on-axis FR measurement (it's gated to eliminate room effects) near the mouth is significantly different from measuring on-axis 2 feet away. Further away, the LF response rolls off earlier (higher in frequency) and the HF response rolls off more slowly. Is this behaviour to be expected?

This is a 200Hz horn loaded with a compression driver. Measuring at the mouth, the LF is approx -3db at 300Hz. 2 feet away, -3db is 400Hz, 6 feet away, -3db is approaching 500Hz. I can certainly hear the hole in the response there from my listening position if I cross over too low.

The HF, on the other hand seems to roll off less steeply when measured from further away.

I'm just wondering if this is standard horn behaviour? I expected the measurment to be different, but I didn't expect to see those general effects.

Thanks

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Topic - Measuring horns - jeff mai 03:55:41 02/05/07 (11)

Re: Measuring horns - weltersys 19:28:22 02/05/07 (0)

Re: Measuring horns - lovetube 16:07:22 02/05/07 (0)

Re: Measuring horns - seh 06:36:08 02/05/07 (0)

Re: Measuring horns - Bill Fitzmaurice 06:32:15 02/05/07 (7)

Re: Measuring horns - jeff mai 23:46:14 02/05/07 (2)

Re: Measuring horns - Bill Fitzmaurice 06:06:48 02/06/07 (1)

Re: Measuring horns - dwkurfman 17:08:33 02/06/07 (0)

Re: Measuring horns - John Sheerin 18:42:41 02/05/07 (3)

Hear that, Tom? - Bill Fitzmaurice 20:11:17 02/05/07 (2)

Re: Hear that, Tom? - John Sheerin 16:04:49 02/07/07 (0)

Re: Hear that, Tom? - tomservo 06:51:37 02/06/07 (0)

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