0 Members and 1 Guest are viewing this topic. Read 4351 times.
Thanks guys, sounds like they are not for me.....
It appears to me that the above poster's experience with planar magnetic midranges is not as extensive as he claims.
For one thing he confuses the Xmax of a driver which is supposed to move pistonically (a cone) with that of the planar,
which has its maximum excursion in the center of the diaphragm and whose motion more closely resembles that of a bowstring.
I have used the BG ribbons (RD50 and 75) in the past, and because they are narrow and clamped on either side, they have little linear travel.
However, our panels sourced from Level 9 in Canada and modified by us, have nearly +/-3.5mm of travel in the center of the panel,
We have 20,000 owners who can testify to how well our panels work in their speakers. If problems existed, I would hear about it on the VMPS Forum elsewhere on this board.
Now take those RD drivers that you posted the link to. Line them with an equally or slightly longer line of small woofer and cross them over in the 1kHz region and you will really have something. Of course you will have to bi-amp them and actively cross them off because the true 1 watt/1 meter output of the RD 75 is in the 83db or less range while a line of just about any woofer you can find will be, ah, much louder. ..
I have had requests to move the crossover frequency up somewhat, and have done so on single, dual and triple panel versions of our speaker. The systems with four or more panels remain crossed over at around 200Hz.
I can't add anything about the ribbons Brian uses because I have no experience with those. I did a lot of work with the 72" BGs when they first came out (early 90s) and Danny's assessmet is spot on.
Danny - If I added a vertical line of 4-5" woofers to my Soundlines and crossed them over as a 3-way, what kind of spacing between drivers would I have to use the get good near-field results? I have read that many of these line-sources must be listened-to at a distance to eliminate the nulling effect of so many drivers.
Something missing so far from this discussion is a consideration of how quickly distortion products rise in this type of driver when the excursion requirements necessary to reproduce lower frequencies at the same volume as midrange frquencies is factored in.
Like the RD series?If so, what did you think?Thankshttp://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=264-700&DID=7http://www.partsexpress.com/webpage.cfm?&DID=7&WebPage_ID=135I'm kind of thinking of a 2 piece speaker system with a sub section that would play up to 200hz or so and XO to a long ribbon like these.I would use a box about the width of the ribbon and about 6" deep to turn it into a monopole.The subs and ribbons would not be connected except maybe by speaker wire if passively XO'd, or not at all if actively XO'd.Any thoughts?
It appears to me that the above poster's experience with planar magnetic midranges is not as extensive as he claims.For one thing he confuses the Xmax of a driver which is supposed to move pistonically (a cone) with that of the planar, which has its maximum excursion in the center of the diaphragm and whose motion more closely resembles that of a bowstring.I have used the BG ribbons (RD50 and 75) in the past, and because they are narrow and clamped on either side, they have little linear travel. Ho ...