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Old 20th February 2013, 04:02 PM   #91
tinitus is offline tinitus  Europe
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old woofer I guess ?
not on Beyma web site

special Brasilian remake ?
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Old 20th February 2013, 05:29 PM   #92
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Quote:
Originally Posted by Cal Weldon View Post
Right Cal,
OB Freq. response arround 100hz. But specs claim a 40hz - 4khz operation range. Wondering if this could be a quality solution to have 40hz big open bass but also midrange quality to blend with a horn.
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Old 20th February 2013, 05:32 PM   #93
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i think they are just a mispelling.
Here they are,
Beyma Speakers - Beyma 12M300 speaker - Beyma 12M300 600 watt 12" woofer for all mid-bass applications. Beyma 12M300 mid-bass and other Beyma 12" speakers here.
still claiming 40hz-4khz operation
but Bass Reflex of 30L and tunning of 94hz provides response down to 100hz.

Sorry for being too noob if you point me to the right speaker simulation software I will put the T/S parameters to review its response, depending on its volume thanks

In Brazil, I am just aware of Selenium that was adquired by JBL.

Last edited by charly chile; 20th February 2013 at 05:34 PM.
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Old 20th February 2013, 05:39 PM   #94
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Quote:
Originally Posted by Jack Arnott View Post
Hi Art, how are you doing?

OTOH, this horn has almost 90 degree dispersion at 15K. That is pretty good. To me its more that it loses its pattern control, not that it doesn't have enough HF dispersion.
Doing fine, up to no good..

You are right, only a small mid driver would have 140 degree dispersion at 1K, making that horn a bit of an odd duck- goes low, but very wide in the usual horn/15" crossover region.
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Old 20th February 2013, 06:49 PM   #95
mitchba is offline mitchba  Canada
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Hi Carlos,

I love high efficiency horns too and using a Nelson Pass DIY Class A amp from way back. I like Bob Crite's Cornscala 3-way design and went with this one: Cornscala Style C | Critesspeakers.com The overall system efficiency is around 100dB according to Mr. Crites.

The xover points are 500/5000Hz. The Bob Crites 15" (Eminence) woofer is very stiff in the QB3 vented box that measures down to 32Hz.

The M2380 horn mated to the Selenium D405 2" driver (not the titanium version), in my humble opinion, is one of the best midranges I have heard. Never harsh and very dynamic.

I am not as enamored with the Selenium D220Ti 1" driver. My measurements with REW shows it rolls-off pretty quick at the top end and to my ears sounds metallic and harsh. REW distortion measurements confirm this.

Recently I was in Toronto at The Speaker Shop and picked up a pair of Flick Systems CP27 1" screw-on drivers for the same price as the D220Ti ($45 each). They are also a phenolic diaphragm like the D405's and sound excellent, no metallic harshness and REW confirms lower distortion.

I also picked up a pair of BMS 4540ND from Assitance Audio - BMS I have not swapped them into the system yet as I am enjoying the CP27's.

All the best in your horn quest!

Cheers,

Mitch
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Old 20th February 2013, 07:02 PM   #96
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Thanks Mitch, this is going to take a while.
I enjoy the process of learining and sharing opinions.
The SET Amp will arrive home probably in march, in the meantime I am sanding and painting "white" my current OBs just to show some respect to my wife and to practice my painting and sanding skills.
Thanks for the tips on stores in Toronto, I go there once in a while (some relatives there).
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Old 20th February 2013, 07:47 PM   #97
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During my net research, I've read good feedback about those Cornscalas.
I think SQ is the most important it doesn't mean your speakers have to look ugly.
I guess those cornscalas with a good wood work and some grills could look owesome, so they can honor their good review.
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Old 20th February 2013, 09:00 PM   #98
mitchba is offline mitchba  Canada
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I imagine you are excited to receive the SET amp!

Attached is a (corny) photo of my finished Cornscala's without grills - I do have the grills.

I did a fair bit of research as well, which led me to the Cornscala's. Attached is the frequency response at the listening position

This is using Audiolense Digital Room Correction software. My target response is -3 dB at 32 Hz, flat to and hinge at 1 kHz, with a straight line to -6 dB at 20 kHz.

I am happy with the SQ. The last bit for me is choosing the HF compression driver.

Cheers!
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Old 20th February 2013, 09:10 PM   #99
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That looks pretty sharp.
How much tube power do you have per channel?
I guess you are using only one stereo amplifier.
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Old 20th February 2013, 09:17 PM   #100
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by mitchba View Post
Hi Carlos,
The M2380 horn mated to the Selenium D405 2" driver (not the titanium version), in my humble opinion, is one of the best midranges I have heard. Never harsh and very dynamic.


Cheers,

Mitch
I personally like the brightness of a metallic dome. IMO harness comes bad from wiring poor capacitors and wire wound resistors in the cross over.

Again do not judge to early when you not did enough crossover work. Try other capacitors metal oxide resistors and try copper wire in different gauge or tinned copper. And silver plated copper and carbon or carbon copper wire.

I had a huge tuning difference with the bi-wire set by testing different loudspeaker wires.
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Last edited by Helmuth; 20th February 2013 at 09:22 PM.
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