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1x Beyma 755TI or 2x DE250/BMD450 ?

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levyte357 View Drop Down
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    Posted: 28 August 2007 at 1:34pm

In recent thread about CD's, Rog recommended Beyma 755TI Neo (1.4" I think), above everything else at that price.

In the same thread was plenty of stuff about Y-type adaptor and multi drivers per horn, and differing opinions about perf of 2x 1" Units compared to 1x 1.4", 1.5".
 
Ready to buy so, wondering if anyone has tried 2x  BMD450's/DE250's on adaptor to Big 2" horn, and how that would compare to 1x £140 B&C/Beyma 1.4/1.5" jobby..
 
Objective is "sturdy"  Compression driver section (per mid top cab) from 1.6khz to 16khz @ approx 110db sensitivity.
 
Regards.


Edited by levyte357 - 28 August 2007 at 1:42pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote uncle-will Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2007 at 7:22pm

your comparing a ford to a rolls.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357 Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2007 at 8:46pm
Originally posted by uncle-will uncle-will wrote:

your comparing a ford to a rolls.



Presuming the 755Ti is the Roller.

Graph from pdf suggests it might need -5db eq from 2 - 10khz.

Anyone else used this?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tekasis Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2007 at 9:41pm
Originally posted by levyte357 levyte357 wrote:

Originally posted by uncle-will uncle-will wrote:

your comparing a ford to a rolls.
Presuming the 755Ti is the Roller.
So that leaves two - What's the ford ? 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote uncle-will Quote  Post ReplyReply Direct Link To This Post Posted: 29 August 2007 at 11:07am
What your comparing is two totally different drivers, the bmd 450 is a one inch exit one inch diaphram and the beyma is a two inch exit three inch diaphram. When you have such a big diaphram on a compression driver it will always stuggle obtaining the same king of efficientcy at the upper end of the spectrum, hench a shelving filter about 6k is usually applied. With some cunning design you can find a way around it. (ref porn horn)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357 Quote  Post ReplyReply Direct Link To This Post Posted: 29 August 2007 at 7:53pm
Originally posted by uncle-will uncle-will wrote:

the beyma is a two inch exit three inch diaphram.



No. The CP 755TI & CP755/Nd are 1.4" exit.

http://profesional.beyma.com/ENGLISH/pdf/descarga.php?pdf=CP-755Ti.pdf

Rog mentioned the CP 755/Nd. I am interested in the 755TI.

The pdf above graphs the 755TI  as usefull upto 18khz.








Edited by levyte357 - 29 August 2007 at 8:10pm
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