Specifications

ManualsBrandsMotion Sound ManualsAmplifierKBR-3D

KBR-3D

-WARNING-

The KBR-3D can produce extremely high sound pressure levels. Hearing protection is

advised. The KBR-3D must be earthed and connected to a correct power source.

-SPECIFICATIONS-

Design Range:

Rotary Channel Input 1 375 mV RMS 100K ohms

Input 2 Unlimited 50K ohms

Stereo Channel All inputs 175 mV RMS 100K ohms

Power amp inputs 420 mV RMS 22K ohms

Dry rotary output 420 mV RMS 600 ohms

Tube: 12AX7EH – 7025 – 5751

Power Amplifiers: 100/100 watt RMS main full range amplifiers

45-watt RMS > 800 Hz horn amplifier

Frequency Response: Full Range speakers 50-15 kHz + -5 dB

Horn driver 600 Hz-8 kHz

Speakers: 2 10” Eminence Beta 250-watt, 8 ohms

2 80-watt 3.5X3.5 Ferro-cooled horns, 8 ohms

1 80-watt MS 1.2 proprietary diaphragm horn driver, 8 ohms

Dimensions: 24” W 21” H 16” Weight 68 lbs.

Power: Fuse (Slo-Blow)

US 117 VAC 50/60 Hz 300 watt 5 amp

Europe 230 VAC 50/60 300 watt 2.5 amp

Japan 100 VAC 50/60 300 watt 5 amp

Fuse Location: The fuse is located in the power inlet module on the rear panel. Use only the

recommended size of fuse as stated above.

Summary of content (9 pages)

PAGE 1
KBR-3D -WARNINGThe KBR-3D can produce extremely high sound pressure levels. Hearing protection is advised. The KBR-3D must be earthed and connected to a correct power source.
PAGE 2
-DESCRIPTIONThe Motion Sound KBR-3D is a state-of-the-art amplifier for keyboard providing all of the features necessary to reproduce stereo and rotary sound independently. The two channels employ technology that is specifically targeted to reproduce and enhance the sound of instruments normally associated with each channel. Hi-Fidelity stereo = piano, strings and synthesizer. Rotary = organ. If your keyboard has multiple outputs, you can send stereo piano and strings, etc.
PAGE 3
Speed Control: Connect the supplied dual button foot switch here. This is a TRS connector where the sleeve is common or ground, the “tip” controls fast/slow operation and the “ring” determines whether slow or stop is enabled. Fast overrides all: When the fast speed is on (yellow fast indicator on the KBR-3D is lit), the stop button does not have effect. When the fast button is pressed again (yellow indicator off) the slow speed or stop is enabled depending on the position of the stop switch button.
PAGE 4
Low Rotor Effect: This controls the amount of low rotor simulator effect. The circuit design is unique to the speaker placement and angle of the KBR-3D’s cabinet. Typical settings of 7-9 are best. This is also a personal preference control. Overall Rotary Tone: This is a combination of contour, low rotor level and bass settings. If overdrive distortion is part of your sound, set that first with the pre-gain and post-gain controls and then set the low rotor volume, contour and bass.
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”. Best signal to noise Loudest operation Bass 2-6 6-9 Middle 2-6 6-9 Treble 2-6 6-9 Use lower numbers in quiet settings; use higher numbers at loud venues.
PAGE 6
Rotary Horn: The horn driver of the rotary channel utilizes a proprietary 80-watt diaphragm specifically designed to reproduce organ sounds from modern and classical keyboards. These instruments rarely needed response above 8 kHz. The driver provides rich, “musical” response over this most desirable range. (You must use a Motion Sound MS 1.2 proprietary diaphragm.
PAGE 7
Motion Sound currently uses an Electroharmonix 12AX7EH tube. Motion Sound recommends replacement with a 12AX7EH, 5751, or 7025. If this is not possible, a 12AX7 can be used if the gain is adequate. Belt The medical grade “pyrathane” anti-static belt is custom manufactured for Motion Sound and will provide years of service. DO NOT USE other belts, as they will damage the servo motor drive system. Belts are available from Motion Sound. Horn Diaphragm Motion Sound used a proprietary MS-1.2 diaphragm.
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