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Bohlender Graebener RD50 Planar Transducer

Bohlender Graebener RD50 Planar Transducer

Brand:| Model: RD50
Specifications: • Power Handling: 70 watts RMS/270 watts max • Nominal Impedance: 4 ohms • Re: 4.0 ohms • Frequency range: 150-18,500 Hz • SPL: 88 dB 1W/1m • Net weight: 25.2 lbs. • Dimensions: 51-1/2" L x 4-11/16" W x 1-1/2" D.
Part # 
Weight: 27 lbs.  
Order Soon - Only 2 Left In StockMore Due In April 18, 2014
List Price$750.00
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Part # 264-702
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Product Details

Bohlender Graebener RD50 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 RD50 driver is 135 watts. The diaphragm is protected within a chassis made of three layers of heavy gauge, self-reinforced steel.

Specifications: • Power handling: 70 watts RMS/270 watts max • Nominal impedance: 4 ohms • Re: 4.0 ohms • Frequency range: 150-18,500 Hz • SPL: 88 dB 1W/1m • Net weight: 25.2 lbs. • Dimensions: 51-1/2" 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
  • Impedance4 ohms
  • Power Handling (RMS)70 Watts
Bohlender Graebener RD50 Planar Transducer
  • BrandBohlender Graebener
  • ModelRD50
  • Part Number264-702
  • UPC844632052989
  • Product CategoryPlanar / Ribbon Transducers
  • Unit of MeasureEA
  • Product Rating
    (1 Reviews)
  • Weight27 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 RD50 Planar Transducer
Bohlender Graebener RD50 Planar Transducer is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from Extremely rapidRD 50 BG is one of my favorite project!Theses planar are very fast to respond!It gives a extraordinary stereo image with a depth that surprise me each time!One hic, there's a sweet spot!;(But, its among my favorite driver!
Date published: 2013-12-23

Product Q&A

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Bohlender Graebener RD50 Planar Transducer

Can these be run open back? or do they need rear air loading??

I've owned neo 8pdr's for years open back. love em....
Asked by: mr1960
They can be used open back, but the phase cancellation means they do not provide nearly as much low end as they would with an enclosure that controls the back wave.
Answered by: platoindy
Date published: 2012-10-15

What woofers would be a good choice to pair with these?

I like the idea of these. I am currently building a line array and since these have a wide freq response I was thinking of doing a Martin Logan Electrostatic-esque type build with these. 8" or 10" in a 1cft box and then these above them. I don't listen at very loud volumes, I just don't want the sub to do all the low end work. I'd want some low-mid punch. If Bohlender Graebener made woofers I'd get a pair of those but since they don't, who would compliment these guys for some low punch around 90-300hz?Thanks in advance!
Asked by: Nonsuchpro
We have many options that will work well in this passband. The Dayton Reference series mid-basses would work well and are our best sellers.
Answered by: MattP
Date published: 2013-12-21

Can you give an example recommended enclosure?

What would a good closed enclosure look like? Can I incorporate a woofer in the same enclosure? Would a trapezoid shape with a woofer at the base be a workable design?
Asked by: mcmillinamps
In answer to putting the woofer in the same enclosure, "Yes" that is fine, but separate enclosures are far, far more versitile and allow you to optimize both imaging and bass response within the room at the same time.If you decide to put the woofer in the same enclosure, remember to isolate the back wave in a sub-enclosure so it doesn't push around the BG driver's membrane. And remember to "flush-mount" the driver; BD drivers are designed to be mounted from the backside of the front enclosure baffle, failing to do this will cause diffraction issues.In answer to the shape question, "Yes", you could use a Trapezoid, but I suggest a standard Rectangle, rather than a Trapezoid. Trapezoids are much more difficult to make than are Rectangles and Trapezoid enclosures are less important than lots of other things, such as a good roundover on the front baffle edges. Using a Trapezoid or other non-parallel wall "shapes" provide less benefit than does addressing a number of other issues, such as 100% fill of stuffing or implementing Baffle Step Compensation (BSC) as part of optimized Crossover Design.[by the way, (BSC) will be affected by cabinet width and distance from the back wall. Shape is even less important than the quantity and location of damper/stuffing used. Many studies on the effects of cabinet design and shape are available for the hobbiest. Check out the "Loudspeaker Design Cookbook" for more information.]BG has previously offered cabinet designs in support of the DIY market (but I don't this this information is readily available from them any more), and BG recommended basic retangle enclosures. As I recall, BG suggested a minimum depth of 3.5 inches because 3.5 inches is standard wall cavity depth, but I urge you to use a depth closer to 6" and to use 100% fill of damping to control standing waves and to prevent the back wave from bouncing right back through the membrane of the BG driver.Another thing to remember is that since the shape of the BG planar magnetic driver is long and narrow, most enclosures are going to be very tall in comparison to the width; enclosures of such proportions require heavy stuffing at the top and bottom to control the standing waves in that direction.Best wishes for success.
Answered by: platoindy
Date published: 2013-01-07

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