BMS CD/horn and ribbon

tinitus · 8th June 2008, 06:49 PM

Anyone knows the BMS 2" 4591

And the Hivi/Swan RT2-pro

Wonder whether they could mate well ?

Otherwise a Fostex tweeterhorn could be an option, but expencive

http://www.bmspro.info/index.php?sho...10281&id=54367

http://www.swanspeaker.com/product/htm/view.asp?id=12

nickmckinney · 8th June 2008, 07:09 PM

The RT tweeters I tested years back were some of the biggest POS that ever hit the market. I have never heard a worse tweeter to be honest.

tinitus · 8th June 2008, 07:37 PM

OK, thanks, that was very clear

DVBjunky · 17th June 2008, 08:56 PM

I am sorry but I think you mean the first RT-Tweeter line (RT-1 etc). The RT-2 Pro and RT-2III are quite good....all right..sometimes there is some quality issues but thats common with chinese made tweeters.

I got fountec ribbons with bad quality.

If your are interested in RT-2II and RT-2 Pro...than maybe look for reviews for the clones from Swans RT-2 Pro , Expolinear RT-7 Pro and others.

They measure quite good. Dont buy the old RT-1 modells. The RT-2 are better.

tinitus · 18th June 2008, 12:48 AM

I think I have settled on a 2way with AE TD15M and B&C DE250 or similar
Problem with a 3way, I dont know where to place the tweeter

But with a 1" to 1.5" CD it may actually work with a supertweeter crossed VERY high

But thanks anyway

sek · 18th June 2008, 08:28 AM

Hi again,

take a look at the BMS 4554, an 1.4" driver with very high frequency extension, even compared to many 1" drivers.

The problem with the BMS coax drivers lies in the severe HF distortion due to the narrow phase alignment slots introducing bad compression and bad diaphragm loading. The innovation with the BMS coaxes is wide bandwith and low cutoff, not neccessarily sound quality.

Take a look at this post in a German discussion forum regarding comparative measurements of different 1", 1.4" and coax drivers. Just scroll down for the pictures, and don't miss the animated distorion graphs of 4554 and 4594.

So if your goal is ultimate SPL over wide bandwith, go with the coax.

Oh, and use a horn or waveguide as large as you can afford...

8th June 2008, 06:49 PM	#1
tinitus diyAudio Moderator Join Date: Nov 2005	BMS CD/horn and ribbon Anyone knows the BMS 2" 4591 And the Hivi/Swan RT2-pro Wonder whether they could mate well ? Otherwise a Fostex tweeterhorn could be an option, but expencive http://www.bmspro.info/index.php?sho...10281&id=54367 http://www.swanspeaker.com/product/htm/view.asp?id=12

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8th June 2008, 07:09 PM	#2
nickmckinney diyAudio Member Join Date: May 2008	The RT tweeters I tested years back were some of the biggest POS that ever hit the market. I have never heard a worse tweeter to be honest.

8th June 2008, 07:37 PM	#3
tinitus diyAudio Moderator Join Date: Nov 2005	OK, thanks, that was very clear

17th June 2008, 08:56 PM	#4
DVBjunky diyAudio Member Join Date: Dec 2006	I am sorry but I think you mean the first RT-Tweeter line (RT-1 etc). The RT-2 Pro and RT-2III are quite good....all right..sometimes there is some quality issues but thats common with chinese made tweeters. I got fountec ribbons with bad quality. If your are interested in RT-2II and RT-2 Pro...than maybe look for reviews for the clones from Swans RT-2 Pro , Expolinear RT-7 Pro and others. They measure quite good. Dont buy the old RT-1 modells. The RT-2 are better.

18th June 2008, 12:48 AM	#5
tinitus diyAudio Moderator Join Date: Nov 2005	I think I have settled on a 2way with AE TD15M and B&C DE250 or similar Problem with a 3way, I dont know where to place the tweeter But with a 1" to 1.5" CD it may actually work with a supertweeter crossed VERY high But thanks anyway

18th June 2008, 08:28 AM	#6
sek diyAudio Member Join Date: May 2003 Location: Berlin	Hi again, take a look at the BMS 4554, an 1.4" driver with very high frequency extension, even compared to many 1" drivers. The problem with the BMS coax drivers lies in the severe HF distortion due to the narrow phase alignment slots introducing bad compression and bad diaphragm loading. The innovation with the BMS coaxes is wide bandwith and low cutoff, not neccessarily sound quality. Take a look at this post in a German discussion forum regarding comparative measurements of different 1", 1.4" and coax drivers. Just scroll down for the pictures, and don't miss the animated distorion graphs of 4554 and 4594. So if your goal is ultimate SPL over wide bandwith, go with the coax. Oh, and use a horn or waveguide as large as you can afford...

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