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Multi-Way Conventional loudspeakers with crossovers

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Old 30th October 2012, 01:56 AM   #11
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Quote:
Originally Posted by Tom Danley View Post
They only do this when they are less than about one quarter wavelength apart.
This is the criterion i think is key. We did an MTM that satisfied this (with 1st order series XO) and it was very coherent/seemless.

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Old 30th October 2012, 02:36 AM   #12
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Default The original question

Coherence in the traditional sense deals with resulting wave patterns and their accuracy compared to "the original source."

Because of the energy differences of frequencies, this accuracy has vastly different "forward and backward" implications when applied to the differences in alignment of drivers.
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Old 30th October 2012, 02:38 AM   #13
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Originally Posted by Pano View Post
My 3-way speakers are 5 feet tall and 30" wide. They almost never sound like 3 drivers, just one big image. How?
  1. Good drivers (Altec and Fane)
  2. Large footprint
  3. Well implemented crossover
  4. Physical offset of drivers to achieve proper phase.
Works for me, but I have the luxury of space.

I'm not convinced that the sound of a single driver is all that great, either. I really don't want to hear the driver(s) or the speaker, just the music. Some speakers allow that, some don't.
I would say that #4 is nothing compared to the other three and the room and placement.

Paul
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Old 30th October 2012, 02:43 AM   #14
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Quote:
Originally Posted by Pano View Post
My 3-way speakers are 5 feet tall and 30" wide. They almost never sound like 3 drivers, just one big image. How?
  1. Good drivers (Altec and Fane)
  2. Large footprint
  3. Well implemented crossover
  4. Physical offset of drivers to achieve proper phase.
Works for me, but I have the luxury of space.

I'm not convinced that the sound of a single driver is all that great, either. I really don't want to hear the driver(s) or the speaker, just the music. Some speakers allow that, some don't.
How do you really know it does not sound like 3 drivers? It may be a silly question but we can easily be fooled into thinking anything. Think for a minute how many variables there are. There are millions. Could any human being possibly compare so many things?
For example I thought my speakers sounded pretty coherent. But when I heard another speaker, I was shocked at how incoherent they were in comparison.
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Old 30th October 2012, 02:46 AM   #15
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This is so easy to solve in my opinion...
Use a 2" or 3" full range driver and cross that bugger low
But why even bother when there is a much bigger problem?
The problem is all the information between the speakers.

Ambiophonics......
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Old 30th October 2012, 02:50 AM   #16
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Originally Posted by Melo theory View Post
This is so easy to solve in my opinion...
Use a 2" or 3" full range driver and cross that bugger low
But why even bother when there is a much bigger problem?
The problem is all the information between the speakers.

Ambiophonics......
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It might be me but what range of response do you expect from a 3" driver?
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Old 30th October 2012, 03:06 AM   #17
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Quote:
Originally Posted by pski View Post
It might be me but what range of response do you expect from a 3" driver?
250-300Hx to >20k

The driver we used in the MTM covered ~350 to 30k

dave
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Old 30th October 2012, 03:09 AM   #18
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Hey Dave, why dont you have a Private message box?
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Old 30th October 2012, 03:16 AM   #19
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So that i get emailed insread -- it is important that all messages go to my mailbox -- it helps me keep organozed.

dave
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Old 30th October 2012, 03:18 AM   #20
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Quote:
Originally Posted by planet10 View Post
250-300Hx to >20k

The driver we used in the MTM covered ~350 to 30k

dave
Thanks for your reply. I'm sorry to ask about the part number and maker.

I'm sure materials have changed and I would love to find this

P
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