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Bohlender Graebener RD75 Planar Transducer

Bohlender Graebener RD75 Planar Transducer

Brand:| Model: RD75
Specifications: • Power Handling: 100 watts RMS/400 watts max • Nominal Impedance: 6 ohms • Re: 6.0 ohms • Frequency range: 150-18,500 Hz • SPL: 88 dB 1W/1m • Net weight: 35.5 lbs. • Dimensions: 75-5/8" L x 4-11/16" W x 1-1/2" D.
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Weight: 37 lbs.  
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List Price$995.00
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Part # 264-700
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Product Details

Bohlender Graebener RD75 Planar Transducer

The RD series of loudspeaker drivers offer the systems designer the advantages of a thin-film, line-source transducer with very high performance potential for fixed installation sound reproduction. Unlike most exotic driver types, the RD series models feature unmatched bandwidth, power handling and ruggedness, as well as the ease of an almost entirely resistive load to the amplifier. All models in the RD Series feature linear, push-pull Ceramic 8 motors linearly driving a polyester diaphragm whose moving mass is actually less than the air load. The bandwidth of the RD Series drivers is extraordinarily large, and is usable from as low as 150Hz to beyond audibility. Program power handling of the RD75 driver is 200 watts. The diaphragm is protected within a chassis made of three layers of heavy gauge, self-reinforced steel.

Specifications: • Power handling: 100 watts RMS/400 watts max • Nominal impedance: 6 ohms • Re: 6.0 ohms • Frequency range: 150-18,500 Hz • SPL: 88 dB 1W/1m • Net weight: 35.5 lbs. • Dimensions: 75-5/8" L x 4-11/16" W x 1-1/2" D.

Bohlender Graebener RD Series Planar Transducers cannot be shipped or sold to customers that live outside of the United States. There is no warranty extended to customers outside of the United States that purchase any of the Bohlender Graebener RD Series (including the RD75, RD50, and RD40) Planar Transducers from Parts Express.

Product Specifications
  • Tweeter TypePlanar
  • Impedance6 ohms
  • Power Handling (RMS)100 Watts
Bohlender Graebener RD75 Planar Transducer
  • BrandBohlender Graebener
  • ModelRD75
  • Part Number264-700
  • UPC844632052972
  • Product CategoryPlanar / Ribbon Transducers
  • Unit of MeasureEA
  • Product Rating
    (6 Reviews)
  • Weight37 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Bohlender Graebener RD75 Planar Transducer
Bohlender Graebener RD75 Planar Transducer is rated 4.8333 out of 5 by 6.
Rated 5 out of 5 by from Foundation for the ultimate 2-way systemIf you find a HF driver that spans enough octaves, you can kill 2 ugly birds with one stone:1) You can use a low crossover. You avoid crossing over anywhere near the ear's hyper-sensitive region of 1-5Khz. Most speakers have a crossover in this range -> serious transient, frequency response and distribution problems.2) You can place your woofer in the corner and still get 100% reinforcement from floor and walls across the entire frequency range, w/ no cancellation. Plus a 9dB efficiency boost.The B-G ribbon solves this beautifully, with response from 200 Hz to 20KHz. Line source means level drops 3dB per doubling of distance not 6dB. 72" is beautifully close to ideal.This is the ultimate 2 way system. One crossover frequency. Simple, elegant. My BG's are sealed for monopole operation. I have Dayton Sledge Hammer 12" Subs and a Behringer DCX2496 digital crossover set at 250Hz, 12dB/octave. 200-300Hz is the ideal place for a crossover. You don't want to go lower than that with these ribbons - too much mechanical stress and distortion below 300. Resolution is incredible. A friend of mine who used to work at a recording studio told me this was the cleanest sound he'd ever heard in his 66 years. Listening to a viola on a flamenco CD, he said it didn't have so much as a trace of muddiness. More than 6 octaves seamlessly reproduced by a single, high-output, fast, linear, ultra-low mass driver.One problem with the BG's: The horn aperture creates a large broad peak centered at about 4KHz. It MUST be corrected. The Behringer DEQ2496 solves these problems with surgical precision, and also deals with room resonances. It also has a time delay which solves the sub/satellite integration issue, a very common problem when you use fast ribbons like this. You can read more about my system and my philosophy of room boundaries & 2-day system design, at ml
Date published: 2014-03-05
Rated 5 out of 5 by from Awesome driversI was so impressed with these drivers at the demo I took the plunge and swapped out all of my DJ and Sound reinforcement setups to them. No regrets, totally awesome. I agree with the other reviews that they should be crossed over higher than the suggested limits. I crossed them at about 300 hz. These speakers have the best vocal clarity of any driver I have ever heard. As a singer with these as the monitors vocals cut through clearly even in previously unmanageable environments. And I don't have to have them as loud as I did my previous monitors. Which of course is less feedback. Matched with a pair of 18" woofers crossed at 500 hz they are incredible for PA useage the people in the rear can hear just as well as the people in the front with far lower overall volumes, they carry just that much better.
Date published: 2013-10-26
Rated 4 out of 5 by from Difficult to use.I have long been a fan of electrostatic loudspeakers and when I heard that the RD 75 B&Gs are even better than electrostatics I was eager to give them a try. I have found it very difficult to get these to perform at the level I have come to expect. First, there is the 5K anomaly that requires a notch filter to tame. Instead I cross over to a RAAL 70-10B at 4K via a Pass Labs XVR1 electronic crossover to avoid this and to get extension up past 20K. Next, there is the dipole issue. I like the dipole nature of electrostatics, but on the Bohlender...mmm not so much. Soon I will try them in an enclosure to see if this helps. Finally, there is the usable range. As others have noted, you really should cross these over at a much higher frequency that the 150Hz stated. I have tried many and settled with 220HZ with a 4th order 24/db octave slope mated to an array of 6 Usher 8955A in sealed enclosures with 1cuft of space per driver. All in all many dollars spent for sound that doesn't necessarily sound better than my electrostatics. Don't get me wrong, these are phenomenal drivers; however, they are just plain difficult to implement sucessfully.
Date published: 2014-03-08
Rated 5 out of 5 by from Wow from long time ribbon lover.I used these in DEQX based system which can correct resonance and droop in high frequencues as well as provide stee/phase perfect XO. These are terrific transducers; apart from peculiar imaging with female vocalists which make them appear larger than real life,superp in all respects IMO. And much, much better than many well regarded high end speakers such as Thiel, Dunlavy, Infinity Prelude I have owned before. I also like effortless dynamics and ability to deliver high SPL's at distances of 12'. I used with two Scan Speak 7" per side, and gargantuan pair of 18" Audire Avalanche subwoofers that could throw 17Liters/stroke (in infinite baffle). I would agree tho if cost no object, begs for line array of high quality, low distortion midwoofs. (As did other reviewer, I ran down to 300Hz just to avoid stress, even though I could have used 300dB/octave XO and lower point probably).
Date published: 2013-06-24
Rated 5 out of 5 by from My favorite transducer i think, period.Hmm where to start! I have used the higher powered commercial version of these in a nightclub for which I was nominated for a Club World award for best Sound by Club Systems Int. (now Club World)7 of the world's top 10 DJs have played this 200 capacity venue for free- just to play on the rig. I run these down to 200 Hz at home but i don't tend to listen super loud... 300 is where i'd suggest crossing if you want more SPL, but I find at home that I really like hearing these from 200 up as it catches the entire male vocal and instrumental range free of crossover artifacts. At home I would use these with a ribbon tweeter as you must be 10 feet away for highs above 10K to develop, I go a simple 1st order at 10 K with a Raven or Arum Cantus.They create a very even soundfield with no floor to ceiling reflections and people sitting 3 feet from them get the same percieved level as people 12 feet away- so it's GREAT for large home theaters where you don't want people in front getting blasted to carry to people in the rear. I suggest an array of small cones like 5 1/4 or 6.5s to fill in the midbass.The sound is... OK- Say you put on a Stevie Ray Vaughn record. Normally you hear the music and it sounds like you're hearing a good recording through a stereo set. With these drivers correctly used, you will hear a Fender amp, not your stereo. I use these with transmission lines underneath as the transmission line bass is the only bass I've had that is nimble enough for the planars. These drivers ( the 50 inch version, RD50) have been used in some systems costing more than $25,000 from respected manufacturer Genesis, which was Artie Nudell's company when Infinity was sold.Oh...and the slim profile gives a very high SAF as well ;)
Date published: 2014-03-08
Rated 5 out of 5 by from Spectacular Planar SpeakerI purchased 2 B&G RD 75's from P.E. and built 8 foot tall MDF cabinets to house them. Each B&G stands next to and supplements a Dynaudio speaker (1" dome tweeter & 7" mid woofer) I built many years ago. The signal of each channel was equalized using pink noise resulting in a flat, combined response from the combination of Dyn. & B&G's, making up for any deficiencies of the RD 75's (they don't go low enough to reach my sub's 80 hz-the 7 woofer makes up the difference & they don't quite go high enough on the top-the dome tweeter solves that problem).My combo allows the RD 75's to do what they do best:Create a HUGE soundstage!They add amazing clarity, size & power to music as well as home theater applications. Just remember: they need a little help, especially on the bottom-linking their 300 hz bottom to a sub.Fantastic build quality. Unique, gigantic sound.Good Luck with your RD 75 project. You won't be sorry you purchased them.
Date published: 2014-02-23

Product Q&A

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Bohlender Graebener RD75 Planar Transducer

Is this driver servicable?

If the ribbon was to fail can it be serviced and at approximately at what expense? Also where?
Asked by: Ez Rider
Yes they can be serviced....Twas about $200 a driver if I remember correctly.
Answered by: JSMD
Date published: 2014-03-21

do these driver require an enclosure

Asked by: Johnny123
I saw this answered by someone at Parts Express that no rear enclosure is required because it is sealed. It is NOT. It is open back and I verified this two weeks ago directly with BG technical department. It is now and has always been an open back design.
Answered by: rep4ever
Date published: 2013-10-25

Is there a minimum listening distance?

What happens to the sound as you move closer to these drivers? Highs change?
Asked by: Herman
Hi Herman. Think of this as "the kids sitting too close to the TV" problem. Everything else in your speaker system will be out of proportion if you are too close. This is a very tall tweter and was never meant to be heard "up close." Three feet or more, six feet is better. There will be a woofer somewhere, right? Getting too close will just make the "arrival time" problems worse. Use the best capacitors you can afford ($40 or more each) in the crossover network. If you are using electronic crossovers and dedicated tweeter only amps, you won't need any crossover caps at all. Don't forget to use a Zobel network to tame its resonance around 5K. It will be the best thing you ever heard! Best Wishes for Great Sound
Answered by: Happy Speaker Builder
Date published: 2014-03-21

I'm considering these for an installation in a high school choir room. How much volume behind the driver is needed?

Asked by: cptomes
This item will mount flush or with the products PE carries. The advantage of this design is that it "cuts through" a reverberant field [I never found a choir room in a high school that wasn't an echo chamber] and it rolls off at 150Hz., so you won't get any boom to muddy the voices. No concern about distance from the wall or amplifier wattage--100watts will do just fine. Check the suggested wall mounts if you need them.
Answered by: Joe from San Francisco
Date published: 2013-10-16

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