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Bohlender Graebener Neo10 Planar Transducer
Off Axis Response???
Does anyone have off axis data for this driver?I noticed B&G use an upper x-over of 1.5Khz.
BG publishes extensive data on their site showing off-axis levels at various frequency responses. While the driver claims a range of 150 - 6000 hz, you will find it used as mostly a mid-bass driver - which is its' sweet spot - think no lower than 300 hz and 3000 hz being the upper end. You could use 6db/oct crossovers - but if you are considering an advanced driver such as this - use either passive or active 24db/oct crossovers and get everything this device can deliver. It is the current day version of what Infinity would have been building for their IRS series - only with better quality control. (I know having owned Servo-statics and IRS series!)... PLan well with this driver and match your other drivers with care and you will have an astounding reproducer of music
Date published: 2013-12-06
I notice the suggested cutoff is 6khz, but the plot shows strong output to 10khz. Is there any reason not to leave its top end unfiltered?
As you approach the upper limits of its effective frequency range, this transducer will exhibit "beaming" behavior; that is to say, it will produce those higher frequencies in a narrower dispersion pattern. Above 6kHz, on-axis response would be reinforced, but the off-axis performance would suffer as the frequency increases. Consider the common garden hose with an adjustable nozzle. Up to 6kHz, this driver would correlate to a wide, gentle spray pattern, covering a reasonably wide area in front of and to the sides more or less equally. Beyond 6kHz, the pattern would become more of a sharp stream, focused directly in front of the driver (and increasingly more forceful).
Date published: 2013-09-08
so does this need a tweeter to back it up and a nice mid bass. Is this basically a very wide and smooth mid??
It is a very capable midrange. Depending upon the particular application, it may be suitable as a stand-alone, however, I would imagine that it's most commonly used with additional components to cover the highs and lows.
Date published: 2013-01-09
Neo 10 - what box size would be best with this driver? Same question for Neo 8 PDR. THX.
The Neo 8 and 10 can have a box behind them. They should be a minimum of the size of the driver internally in width and height, and no less than 3" deep. The cabinet area should be filled with insulation. The use of a cabinet will create a smoother low end response curve without the dramatic roll-off. It will not extend the bass or increase the output capability. The idea here is that you want a monopole configuration rather than dipole. On the low end, use a 24db/oct x-over when approaching the stated low cut-off. You can use a 6db/oct when you double that number.
Date published: 2013-12-06
From a novice, would the frequency response increase with multiple drivers? Can they effectively be arrayed on both planes to increase efficiency.
This is a very high end driver. It is designed into speakers beginning at like 2 grand a pair and up... So plan your project very carefully. Check the Bohlender Graebener Neo10 Planar Transducer Product ResourcesNeo10 Specifications Datasheet Neo10 Specifications Datasheet on the product page - it's critical to understand this to create the best possible speaker... Here are few basics... If you do a vertical 3 day, you'll have great dispersion. Anytime you start stacking them vertically, the dispersion starts to beam - hence you'll see them in 4 or 8 drivers etc... As for efficiency. Here's the physics rule. Double the drivers and you get 3db more efficiency. So one driver equals 92, two equals 95, four equals 98 etc... You can mount these dipolar in a frame - size and shape determine where the low frequencies begin to roll off and how you should adjust the crossover network, or have them as monopoles. BG describes how to do this in their documentation. You will want a FAST mid-woofer to match with them - think Morel MW164 or similar, and the NEO 3 PDR or if you want to spend more - the Aurum Cantus product. You can do passive or active crossovers. Tri-amping is awesome. A 3 way with 6db/octave slopes at the right frequencies will be very musical... From there it gets complex if you want to have steeper slopes... 24db/oct crossovers are complex and expensive - but can increase power handling capability and allow the NEO 10's to operate lower. Plan well - this is an expensive and wonderful driver. I've build many projects with NEO 8's, NEO 10's, NEO PDR 3's, Ribbon tweeters and a multitude of high end mid-woofers like the MW164. (Oh - air core high gauge inductors and poly caps are mandetory as these drivers reveal everything... Prepare to hear the music for the first time.
Date published: 2013-12-06
What sized baffle if mounted separately?
Thinking of a new project that is more modestly scaled (and priced) than my last which used the RD75, 2 scan speak revelators and 2 18" woofers in an IB. That system was amazing in some ways and rivaled many high dollar commercial offerings, but imaging was often megasized--like perched on the singers lips looking down her throat. Now hoping to capture the essence in a much smaller and portable project using two Dayton 12 subs crossed over around 150-200 to this driver (neo 10) which in turn will hand off to a neo 3 or similar (undecided here). My beloved DEQX will do duties for all crossovers and transforms once again--but thinking side firing 2.4 cu feet enclosures for the woofers using say one of the newer Behringer amps. From these a pole will stick out from the top of the woofer modules to which a small plate baffle housing the mid/tweets will be attached--will set it up such that vertical height can be dialed in just so and adjustable for different circumstances. Question is I want to use a narrow baffle (no box) for the 150Hz and up drivers and am worried about the FR due to interference from the back wave. I got away with a baffleless design with the big B&G drivers but that is horse of a much different color. Now I want to get back to a more natural imaging system but love that B&G sound. Any help greatly appreciated. And no I am not too concerned about the woofers sounding "slow". If it turns out that this is an issue--I'll add a small high quality woof to each side to cover say 60-200Hz.
Your first speaker did a great job - in a BIG way. I understand your new concept. If you research the Infinity Beta - you can see their 3 way EMERM/EMIM/EMIT design. The ideal use for a single Neo10 with a small baffle would have a crossover point of 500 hz for average playing volumes, and 800 for playing loud. Consider the Infinity IRS and the bafffle sizes for their EMIMs to achieve 80hz. If you use a "length of sound wave calculator", it will tell you the baffle size where the sound wraps around and then cancels the output for 150hz it's 90", for 800 hz it's 17". No this is an over simplification and doesn't take into account all acoustic engineering factors of the driver to be spec'd. In your situation - your design will work much better with a midbass covering 80 to 500, and then go to the Neo 10. As for the "pole", there are resonance issues, vibration and time alignment problems. THe DEQX aside, it can only correct for one position - and with the pole - the time alignment would be different everywhere except for a sweet spot... Do check out the web for the Infinity Beta 4 way as a reference to your project. You're doing a similar thing with the exception of using a mid bass cone over their large bass panel. As for the NEO 10's reaching 150 hz - this is achieved by multiple units, cabinets or large baffles and other means. A single unit in a thin frame won't be able to do that. Keep in mind that if your -3db down point is 150hz, even at 24 db/oct crossover, it's still only -27 at 75hz. At 92 db efficiency, it would still see a substantial load from the amp at 65 hz and you would risk driver failure.
Date published: 2012-12-25