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I am really curious how a BG line array and a pair of subwoofers that can be high passed at like 250 hz would sound.http://www.partsexpress.com/webpage.cfm?&DID=7&WebPage_ID=135#neo
Well, I used the BG 520DX (50-inch BG ribbon with twin 6.5 inch midbass drivers) with biamped twin 12-inch subs. I really liked the BG ribbons but they sounded similar to the Newforms in that they were too thin for my tastes. This led me back to Maggies and the 1.6QR. Note that I am heavily biased in the direction of huge soundstage, WARM midbass, etc. Neither the BGs or the Newform are bad speakers, they just aren't Maggies.
Perhaps the reason they sounded thin, has to do with the mismatch between a pair of mid bass drivers which roll off as a point source and the quasi line array behavior of the long ribbons, i.e spl falls off inversely with r instead of r^2. As to huge soundstage, can't imagine the smaller Mags even coming close to the huge soundstage the RD-75;s project. In fact it is so large, many consider it a liability and not a virtue. Anyway, this is what guided my thinking into using a line array of dipolar woofers to ...
Of course i will I dont really want to sell my Krell and the Jolida. What i have heard so far, is very promising that it will sound great with them. I am currently looking for a speaker/powercable solution (3powercables + spkr cables) for around 400$.Any ideas?
Horizions,Curious, where were your xo points?
Hi allI am using B&G (Bohlender Graebener www.bgcorp.com) ribbons but theirown finished design rather than OEM devices.The model is Radia 520 and use a 50" ribbon, open back di-pole with 2x 6.5" dynamic bass drivers.I have found the design to be deficient as a passive speaker, that isuntil I started to use the DEQX and removed the passive network alltogether.I have tried other DSP units as a 2 way active plus sub but I have tosay, these speakers have really come to life when using the DEQX.The ribbon has an inherant 12dB resonance at about 4kHz then a rapidin room hf role off.I have these placed in a large open plan room about 4 feet or so fromback wall and no side walls near. I was able to get a succesful nearfield speaker measurement placing the mic about 1m from the panel,however, the difficulty was in getting a good reading average fromboth the ribbon and the bass drivers as the bass drivers are veryclose to the floor yet still produce midrange up to 350Hz or so.Lowering the mic toward the bass drivers of course introduces floorreflections so you have to be carful of this. After some playing round I was able to get DEQX to make a speakercorrection that looked pretty good. I confirmed with another analyserin room that the correction was OK. I found that back wall reflectionsdidn't make a big difference to measurements in my particular room.With DEQX crossovers and speaker correction, these speakers have cometo life and have impressed all that have heard them. They havephenominal dynamics and transient speed and 3D imaging like you don'tget from forward firing speakers. They don't spec very effient onpaper but I find that in room they have huge headroom when driven witha decent amount of power and have huge peak output and power handling.My recommendation is to measure the system (ie. the driver mounted theway it is going to be used) rather than raw drivers. B&G have donesome mechanical tayloring with damping material on one side of theribbon enclosure etc so the final result is different to the rawdriver. The enclosure you mount in will also make differences to themeasurments.The B&G Radia 520's are a great example of were the DEQX can workwonders and make a problematic speaker really shine.Rob J.
