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Bohlender Graebener Neo8-PDR Planar Transducer
Automotive Use for A-Pillar location
I am thinking of putting these in the A-Pillar along with a neo-3pdrI notice most responses saying that these need to be run open backed or in at least 100cu inches. Would mounting them in a custom a-pillar stuffed with fiber be enough to eliminate the issue with the back wave or would this kill the performance of the driver? There is obviously not room in this location for air space but if I can effectively absorb the back wave would that be sufficient to allow me to cross over around 500-800 hz?
Hello - The neo3pdr has a back cup and is easily placed in an automotive environment. If you want to use the neo8's, you must have the enclosure space. Otherwise you won't get any real response below 1500 - 2000 hz. Hence, all you would need is the neo3. Creating audiophile sound in a car is much different than just "loud". Woofers are easy due to their non-directional difficulties. Replacing the high end with planars gets trickier due to phase and size... the neo3 is really the best single planar for your application. You would be best to mate that to a very fast mid-bass driver and add a subwoofer... Building the 8's into an auto is doable - but the amount of work to get it right may not justify the result.
Date published: 2012-06-08
what's the difference between this and the neo 8
In the Neo transducers from B&G, the PDR version is an updated version of the original model. The PDR versions have a better off-axis response, lower sensitivity, and slightly higher resonant frequency. The original versions have a tighter dispersion pattern (at the cost of off-axis accuracy), slightly higher sensitivity, and not quite as low a resonant frequency. In this case, the original Neo8 will handle slightly more power as well, however barely enough to mention.
Date published: 2012-10-27
I am trying to find the neo8pdr back cup
None is available. You need a minimum of 100 cubic inches with insulation behind the neo8 if you don't want to use it as dipolar. No cup could be big enough and not cause unwanted resonances... Create a cavity in your cabinet for the neo8
Date published: 2012-03-25
I want to run these directly from my power amp which is being controlled by an active crossover, can these be run in this manner or do they require some electronics between the amp and planar?
These are no different than any other speaker in that regard. It is always good practice to have some sort of passive high pass filter in place in case the electronic crossover fails.
Date published: 2014-04-08