Quote:
Originally Posted by jinx20001 /img/forum/go_quote.gif
yes i can see why you would bet burned for saying the e500 lack sub bass power, ...
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Talked about it somewhere else but could not find it.
The reach of 25hz, like i sad in point 1.
About the UE 5 EB, the problem here is that the lowdriver goes on to far! Way up and past a 100hz, and so, overwhelming the mids. If it could be crossed at see a 100hz, I would be a very happy camper. I once had the pleasure of testing the Shure E500 (test has gone offline
, but the 2 drivers help in the upperlows, but does not much for that (for me) important 40hz-80hz range. The SPL are behind on the mid/high range. Remeber, a 3 dB drop equals half the volume. And besides that, dynamic drivers just move more air which translates in higher reachable SPL's than armature drivers.
But dynamic drivers have another shortcoming. Something understood by Bang & Olufsen with there Adaptive Bass Linearisation (ABL). If a driver is sealed in a room, there is a point where increasing volume does not result in more bass. After this point the more volume you give, the more muddy'er it will begin to sound. Kinda like the room is full and can't handle a bigger pressure swing (a.k.a. sound). To let a dynamic driver reach lows, there is almost everytime a small chamber behind it. Increase the volume over a certain treshold, and the bass will turn muddy. Armature drivers don't seem to have this problem. When reaching there treshold, the just don't go louder.
On the other hand, if volume is to low, because of the way you hear, you will start loosing hearing sublows. The Fletcher–Munson curves.
All in all very interesting stuff. A good solution would be to design a headamp with a digital volume control. Use a crossover to split the sublow from the rest. run the sublow through a filter that correct the low roll off drivers have (have a look over
here). So for example each 6dB/octave loss of the driver, boost 6dB/octave. The starting point where this filter starts should be controllable and i don't know if all headphones roll off with the same amount else this would also be selectable.
The rest signal get's it's own volume controller and act as a master. The sublow volumecontroller is programmed in such a way that it follows the master-volume-controller. Find the point where you lose hearing the sublow signals. (Fletcher–Munson point) this will act as the lowest point this sub-volume-controller would reach. To put it better, if the master-volume-controller decreases beyond this point, the sub-volume-controller doesn't follow but remains on that level. Find the second point where the used driver has reached it's point where increasing the bass will only result in added muddyness instead off more bass. Let's call this the saturationpoint. When increasing the master-volume-controller past the saturationpoint, the sublow-volume-controller remains on it's saturationpoint. (the idea behind B&O's Adaptive Bass Linearisation). Implemitation would look like a volume knob with 2 buttons. Set the volume on normal listening level, decrease the volume, when you notice the sublow start to fade. puch the flatcher-munson-point-marker-button (the marketing boys and girls would have a fieldday with this kind of terminology
). Then increase the volume and when noticing that the sound starts to muddy up, hit the second saturation-point-button. And you're set, just select you're desired listening volume and enjoy. Let's call it smartDrive™©®...
Add a easy to measure/implementation HTRF and a Bionic EQ curve on this amp and you've got yourself a winner. There is a nice HTRF solution out there already, but not kind off portable and it's hefty price tag is also a big problem. Enter the Studer BRS (Binaural Room Scanning) processor:
Maybe we should contact
Tension Labs and let them know that the
EAP 03 needs some follow up work...
edit: email send, have to get back to me...
