^ personally im not getting 2x more 15" rythmik subs for higher spl.. 1x d15se is more than enough.. im getting 2x more for extra potent rumble/tremor/eathquake @ low spl
Originally Posted by Rythmik Well, I did have a project like that. The idea is to extend the servo operation to midrange driver
while keeping the tweeter nonservo. I have done everything I could to reduce the voice coil inductance, including an alumimun phase plug which may turn out to be a bad idea. Just demonstrated the system at Danny's house (GR Research) before holiday. Since the midrange can also be used as nonservo, I have design a passive xover for the midrange drivers so that they have the same response as in servo mode. This makes the comparison of servo vs nonservo easier. To make the long story short, I do think the improvement on dynamics such as drums is very audible
. However, there are some resonances above 500hz
that keeps them from being perfectly flat and Danny can easily point them out even before we proceeded to measurement. It is a type of parasitic resonances that servo cannot correct. Because those resonances showed up only after I put them in enclosures, I do suspect it arises from enclosure's air spring and the air gap between phase plug and voice coil. In short, the box is technically not sealed at all. I will try out different enclosure type such as TL or vented box so those 5-1/4 midrange driver can play into 50hz/40hz without a sub. While it may not play very low, it does make the assessment of merits easier.
but even with those resonances it probably sounds better than a lot of the loudspeakers out there
how about a vaccum sealed enclosure ?? without imploding
how about full range servo driver instead ??
bigger enclosure probably ?
i dont care/mind how big the enclosure needs to get to minimize those parasitic resonances.. make it as big you have to
is this the plan for 2010/release loudspeakers sometime this year ? cause i could wait on the mains upgrade..