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Crossovers - T27ab for T33

 
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roke
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Joined: 01 Jun 2006
Posts: 3

PostPosted: Fri Aug 25, 2006 12:41 pm    Post subject: Crossovers - T27ab for T33 Reply with quote

Hi. Just wanted to check I'm not missing anything (novice speaker builder Wink

I have taken the HF (T27 Acoustic Butterworth) section from the 104ab crossover design and substituted it for the T33 section on the CS7 design (I'm using drivers from a Concerto in a CS7 based cabinet design). Should this be ok?

Then, I was thinking of substituting polypropylene or mylar capacitors for elctrolytic throughout, and using air cored inductors in the LF section, and ferrite cored in the MF and HF.

Also, I have rounded the edges of the front of the cabinet. I'm thinking now that there might be edge diffraction compensation built into the CS7 crossover which I have just messed up by rounding the edges. Thoughts?

Any advice much appreciated.
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ColinR
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Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Fri Aug 25, 2006 1:59 pm    Post subject: Reply with quote

Quote:
I have taken the HF (T27 Acoustic Butterworth) section from the 104ab crossover design and substituted it for the T33 section on the CS7 design


Fine.

Quote:
I'm using drivers from a Concerto in a CS7 based cabinet design.


Not fine, as the B110B is 10% more efficient than the B110A you might not like the "lean" midrange.

Quote:
Then, I was thinking of substituting polypropylene or mylar capacitors for elctrolytic throughout, and using air cored inductors in the LF section, and ferrite cored in the MF and HF.


Series components affect the sound so better/more expensive capacitors in these positions.

If you use an air core in the bass section loose the resistor.

Quote:
Also, I have rounded the edges of the front of the cabinet. I'm thinking now that there might be edge diffraction compensation built into the CS7 crossover which I have just messed up by rounding the edges.


Yes and probably not, unless the flat part of the baffle is 6.5" wide like a Ref 105 head.
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roke
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Joined: 01 Jun 2006
Posts: 3

PostPosted: Mon Aug 28, 2006 2:05 pm    Post subject: Reply with quote

Thanks for your help, Colin.

I am going to model the crossover in SPICE and try to make it work for the B110A.

But what would be ideal is to get my hands on the Falcon no.53 crossover. However I understand Malcolm Jones has left Falcon, and Falcon now cannot supply this item. Does anyone on this group have details of the no. 53 crossover they would be willing to let me have?
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ColinR
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Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Thu Aug 31, 2006 2:46 pm    Post subject: Reply with quote

Quote:
Malcolm Jones has left Falcon, and Falcon now cannot supply this item


A bit perturbing eh folks, signs of things yet to come? Sad

Ronan has his crossover details btw.
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