Motion Sound KBR-3D Specifications download pdf (Page 5)

Overall Stereo Settings: The KBR-3D stereo channel utilizes total attenuation tone controls, thus

if bass, middle and treble are set to “0”, virtually no sound will get through to the power

amp section! This is very versatile but at least one of the tone controls should be set to

“3”.

Bass Middle

Treble

Best signal to noise 2-6 2-6 2-6

Loudest operation 6-9 6-9 6-9

Use lower numbers in quiet settings; use higher numbers at loud venues.

-REAR PANEL CONNECTIONS-

XLR Line Outputs: Signals from the low rotor simulator, the line level inputs, and the full range

stereo channel is sent here. The horn level, as set by the microphone mixer, is also

present (Z out approximately 600 ohms; 70 mV RMS nominal).

Microphone Volume: These two controls mix the rotary channel horn microphones >600 Hz into

the XLR outputs. The level should be set after all parameters on the rotary channel pre-

amp are adjusted. The microphone mixer can be set to zero if external miking is

preferred.

¼” Line Level Inputs: These inputs feed directly to the 100/100 amplifiers and are not affected by

either pre-amp setting. You can connect a mixing board for vocals or any other typical

signal source (420 mV RMS nominal). Volume must be controlled by the signal source.

Dry Rotary Output: This signal is tapped just after the 12AX7EH post-gain control, before the

low rotor simulator volume and bass controls. It provides a line level output to drive

reverbs and other effects where the rotary effect is not desirable. Many “classic” organ

speakers used “non-rotary” reverb in conjunction with rotary sound (420 mV RMS

nominal).

Power Supply: The KBR-3D contains two 100 watt power amplifiers for the full range system

and 45-watt amplifier to drive the horn from>800 Hz. The power supply is capable of

200 watts RMS that is shared between the three amplifiers. Music is almost always

transient in nature and tests have verified the cost/weight effectiveness of this supply in

the KBR-3D. Volume levels requiring sustained 200 watt performance should be

assisted by a PA system, both for hearing protection and for a generally better sound.

Speakers: The KBR-3D utilizes high efficiency 10” 250-watt speakers and 3.5X3.5” Ferro cooled

horns. Reproduction of piano was of primary concern during speaker selection. The

transient nature of piano is one of the best indicators of an amplifier’s performance. The

KBR-3D cabinet angle and speakers provide an incredible 120 degrees of treble

dispersion producing a wide angle of full frequency response.

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Motion Sound KBR-3D Specifications Page 5