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Multi-Way Conventional loudspeakers with crossovers

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Old 14th December 2012, 09:22 PM   #21
Kei is offline Kei  Wales
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Got all the bits and had a measure at 1m on axis for the right speaker using holm. (just a test in the listening room as it's not possible to measure them outside today) Definite dip at the crossover point where the two are out of phase.
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Old 14th December 2012, 10:25 PM   #22
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That looks real. If you clear out enough space so that distance to the floor is the first reflection, you can probably get the gating limit down to ~500Hz (it still won't be terribly accurate below 1k, but you'll get a better idea of the response trend). Do you have them out of phase on purpose to see the crossover summing?
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Old 14th December 2012, 10:28 PM   #23
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P.S. Now you can also measure 1cm from the woofer without gating to see how your bass tuning is looking.
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Old 14th December 2012, 10:33 PM   #24
Kei is offline Kei  Wales
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The crossovers called for the tweeters to be out of phase. Just followed the chorale design.

Last edited by Kei; 14th December 2012 at 10:37 PM.
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Old 14th December 2012, 10:36 PM   #25
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Well, for one reason or another, yours need to be wired the other way from what they are now.
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Old 15th December 2012, 04:52 PM   #26
Kei is offline Kei  Wales
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Ungated woofer response measured at 5mm from the grille.
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Old 15th December 2012, 05:47 PM   #27
tvrgeek is offline tvrgeek  United States
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Quote:
Originally Posted by Kei View Post
Thankyou Laurence, very useful info. Will measuring their response in my room be useful, or is better to measure them in an open space. (Or both where possible)
You need to learn what the measurements mean in your room, nearfield, farfield, and outside. None of them is exactly correct, but each teaches you something.

I prefer ARTA to HOLM. I also have Sound Easy. Does everything, but easy or cheap it is not.

To understand measurements, please pick up Joe D'Apollito's book, Testing Loudspeakers. It does not cover the modern digital testing, but it does cover the physics. You need to understand what you are measuring.
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Old 15th December 2012, 07:24 PM   #28
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Ungated woofer response measured at 5mm from the grille.
Looks pretty excellent to me. Now how about swapping that tweeter polarity and getting the HF level dialed in!

Last edited by dumptruck; 15th December 2012 at 07:27 PM.
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Old 15th December 2012, 10:16 PM   #29
Kei is offline Kei  Wales
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I've got arta as well so could do similar tests. Will see whether I can find that book.

I'll swap the polarity on the tweeters and have another measure of the 750hz gating.
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Old 16th December 2012, 05:58 PM   #30
Kei is offline Kei  Wales
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Had a look for that Joe D'Apollito book, Testing Loudspeaker's and found that it is nearly £50 in the UK. (bit expensive for a book)

Switched the tweeter phase and this is what i've got. (green is antiphase) I'm guessing the big dip at 8KHz is something to do with the room.
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