RBH Sound MC-615-70 - Manual (Page 4)

Features
The RBH Commercial speaker consist of two models, the MC-615-70 and the A-615-
70 Both models incorporate metal enclosures to reinforce bass frequencies allowing
a deeper and more controlled bass response. Both models also utilize an acoustic
suspension design and offer operation in either 8 Ohm or 70 volt modes.
A powerful magnet, extended voice coil and bumped back plate give the bass/
midrange drivers high excursion capability. This ensures accurate dynamic
reproduction. The MC-615-70 uses a proprietary aluminum woofer and tweeter. The
special aluminum cone material combines stiffness, low mass and self damping
properties in a manner that allows virtually uncolored presentation of program
material. Both tweeters feature Ferro Fluid™ liquid cooling to allow greater power
handling.
Steep acoustic slope crossovers are used to integrate drivers. The use of steep
crossover slopes allows high power handling, minimizes driver interaction anomalies,
and maximizes the clarity with which each driver is able to produce its respective
frequency band. Sophisticated computer modeling techniques are used extensively
in the RBH speaker design process.
A switch connected to the tweeter allows you to custom tailor the sound of your
speaker. This switch is located next to the woofer on the front baffle of the speaker
and has three positions: +3dB, 0, and -3dB. The +3 position increases output of the
tweeter, the -3 position decreases the output of the tweeter relative to the woofer.
The 0 position is the factory setting and generally provides the most natural
response from the speaker.
The use of a 70 volt transformer allows many speakers to be used together by
running a connecting wire from one speaker to the next, without concern for the
impedance seen by the amplifier. A 70 volt amplifier must be used to accomplish
this. Please refer to the following pages for instruction and wiring diagrams to
properly install a 70 volt system.
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