I have just found MB Quart tweeters (most 1" titanium) on a sale page but the specs and normal price list is not on the page. Does anyone know the value and specs of these tweeters? 95-6738 1" titanium, 95-6934 1" titanium, and 95-6665 1" titanium.
I never heard of this brand, any info would be a help.
thanks
I never heard of this brand, any info would be a help.
thanks
I've been over this site and have found no specs for these (or any other) tweeters. am I missing something?
Hello there,
I am an MB Quart finatic and have a huge number of both their car and home speaker sets/drivers/tweeters. I am just in the midst of moving and have everything packed away right now. I will look through my collection within the next week or so and see which ones those numbers that you gave refer to. I am not quite sure off the top of my head. If you are still interested in this information please let me know and I will see what I can do to dig it up for you.
I especially collect MB Quart Tweeters and have a majority of the models of them, at least the higher end (the 1 inch) ones anyways.
Chris
I am an MB Quart finatic and have a huge number of both their car and home speaker sets/drivers/tweeters. I am just in the midst of moving and have everything packed away right now. I will look through my collection within the next week or so and see which ones those numbers that you gave refer to. I am not quite sure off the top of my head. If you are still interested in this information please let me know and I will see what I can do to dig it up for you.
I especially collect MB Quart Tweeters and have a majority of the models of them, at least the higher end (the 1 inch) ones anyways.
Chris
Hi
Looked at the plots. Amazing low primary resonance at 550 Hz! WAG rule of thumb says can cross at 2x550 but...Looks like another resonance or something around 1,8 to 3 KHz. Can even detect a slight rise on the impedance graph around that area. Not sure if it can be heard crossed steep near there but one could wonder about it. Do you need to cross it that low or could you go after this anomalie? Mainly wondering aloud I waven't worked with metal dome as a practice.
How about this one if you need to cross that low? http://www.madisound.com/cgi-bin/index.cgi?cart_id=4015536.26919&pid=2155. Looks much smoother but rolls off probably too much off axis around 8 KHz or so, but combined with a gentle single cap Xover and super tweeter might be the ticket.
Looked at the plots. Amazing low primary resonance at 550 Hz! WAG rule of thumb says can cross at 2x550 but...Looks like another resonance or something around 1,8 to 3 KHz. Can even detect a slight rise on the impedance graph around that area. Not sure if it can be heard crossed steep near there but one could wonder about it. Do you need to cross it that low or could you go after this anomalie? Mainly wondering aloud I waven't worked with metal dome as a practice.
How about this one if you need to cross that low? http://www.madisound.com/cgi-bin/index.cgi?cart_id=4015536.26919&pid=2155. Looks much smoother but rolls off probably too much off axis around 8 KHz or so, but combined with a gentle single cap Xover and super tweeter might be the ticket.
Hi infinia thank for the reply
This is my second attempt with metal dome tweeters. I first tried an aluminum dome didn’t like it, maybe I screwed up, it was 10 years ago. I know a little bit more now. If I don’t like or can’t get it to work properly, I have two Seas 27TDFCs.
Im using the RS180 as midbass, so the crossover point will have to be in the 1.8k area.
My project is already underway; it can be anything more than a two way system
This is my second attempt with metal dome tweeters. I first tried an aluminum dome didn’t like it, maybe I screwed up, it was 10 years ago. I know a little bit more now. If I don’t like or can’t get it to work properly, I have two Seas 27TDFCs.
Im using the RS180 as midbass, so the crossover point will have to be in the 1.8k area.
My project is already underway; it can be anything more than a two way system
Oops OK you have them already, sorry I thought you were in planning stages. Still can use a second order HPF a little higher maybe at 2.5KHz as a backup plan for the tweeter. Woofer is metal as well, so uses a notch or a Cauer 3rd order.
From all I read about the RS180, the information suggests that it shouldn’t be crossover that high. Have you read something different? More information will defiantly help.
The double magnet 1" domes started life as a custom design developed in cooperation with Avalon Acoustics for their original Avalon Ascent and Eclipse loudspeakers. The design proved so successful, MB introduced the tweeter as a regular item in their product line.
Hi
Firstly. What is your guide source you are referencing? You have said very little of your design and it's goals. So I'm mostly in the dark as to advice. Is it a MTM? If MTM then the crossover point is driven by the woofer alignment ie center spacings, not by other issues.
Firstly. What is your guide source you are referencing? You have said very little of your design and it's goals. So I'm mostly in the dark as to advice. Is it a MTM? If MTM then the crossover point is driven by the woofer alignment ie center spacings, not by other issues.
My goal is to build a two way system,one tweeter and one midbass. Im going to build two subwoofers using 2 8" woofers each. Im not going to spend much time on the subwoofers,I will simple cross them over around 75hz. Here is a picture of the enclosures.
http://www.diyaudio.com/forums/attachment.php?s=&postid=961224&stamp=1152833063
http://www.diyaudio.com/forums/attachment.php?s=&postid=965858&stamp=1153427982
The subwoofer wont get much play but I am making it just in case
http://www.diyaudio.com/forums/attachment.php?s=&postid=961224&stamp=1152833063
http://www.diyaudio.com/forums/attachment.php?s=&postid=965858&stamp=1153427982
The subwoofer wont get much play but I am making it just in case
infinia said:
I think 1,8KHz is the best cross for a MTM using a 7" midbass. But...For a 2 way I don't see any reason not to push it (RS180) up a bit more esp if you want to ease up on this tweeter and make it sound more reasonable. The tweeter response seems problematic if you cross it lower than 2,4KHz. I think you can spend a lot of money and time to make it work tho. IMO Without going too exotic in the xover, the tradeoff will come down to.. do you want to hear more of midbass breakup hash or tweeter ring a ding.😀
Offhand for basline design I think 3rd order cauer LPF with 2nd order HPF with aggressive zobel on tweeter Xover centered around 2.4KHz. Or use a proven design with a better tweeter.
as always YMMV
infinia
Thank you very much for your input. I won’t have to deal with the crossover for at least another 8days but you got me thinking.
1.8k is just a target most projects I came across used 1.8k (+/- 200 Hz).
I have plenty caps and enough inductor (I hope), my not stuck on any set crossover frequency. If things don’t work out, I can always use the Seas tweeters.
Thank for your ideas, keep'em comin
Thank you very much for your input. I won’t have to deal with the crossover for at least another 8days but you got me thinking.
1.8k is just a target most projects I came across used 1.8k (+/- 200 Hz).
I have plenty caps and enough inductor (I hope), my not stuck on any set crossover frequency. If things don’t work out, I can always use the Seas tweeters.
Thank for your ideas, keep'em comin
Some people just love metal domes and MB seems to be using this technology for a long time, so must be something there. I think it's great they have big rear chambers for lower Fs. It would be interesting to sort out what the mechanism for the response anomoly is. Some of the other MB drivers seem to be much smoother there. Maybe the sample tweeter that was measured had this problem and yours don't.
PS I wonder since they don't provide T/S figures if these are OEM rejects. I remember they used to support DIY better.
PS I wonder since they don't provide T/S figures if these are OEM rejects. I remember they used to support DIY better.
I not a big fan of metal dome per se but I was defeat by a pair of aluminum dome. I will try metal again, hopefully it will work out.
I think they are rejects the voice coil lead is extended pass the terminals and need to be cut. With any luck that is the only problem.
I think they are rejects the voice coil lead is extended pass the terminals and need to be cut. With any luck that is the only problem.
Wow that midrange has very nice flat frequency response. And the break-up node seems well damped. I wonder how it compares to the dayton RS52 which i'm using in a project now.
I like those Wilson Clone enclosures. Just because that titanium tweeter has a low FS does not mean it can cross over low. It might have quite a bit of distortion down low like the Vifa XT25. Also you'd be restricted in SPL because of xmax. it'd be fun to try out those MB quarts, but if you want a metal dome that crosses low try the Seas 27TBFCG magnesium/aluminum dome.
I like those Wilson Clone enclosures. Just because that titanium tweeter has a low FS does not mean it can cross over low. It might have quite a bit of distortion down low like the Vifa XT25. Also you'd be restricted in SPL because of xmax. it'd be fun to try out those MB quarts, but if you want a metal dome that crosses low try the Seas 27TBFCG magnesium/aluminum dome.
I've had a look at the chart, and you could get away with a 1st order filter at 3.5k if your midbass can go that high - the slight 'hump' at 2k would 'fill' any filter deviations and avoid the 'resonance'.
More useful would be a waterfall plot to see just where it actually rings (and the sidebands), but that would be my starter for ten
HTH
Owen
More useful would be a waterfall plot to see just where it actually rings (and the sidebands), but that would be my starter for ten
HTH
Owen