Kenwood RX750MD + RD350

The Kenwood RX-750MD is a single-DIN MiniDisc receiver with an FM/AM tuner and control for an external CD player or disc changer. Kenwood's designation on the manual cover is MDレシーバー〈CDプレヤー/ディスクチェンジャーコントロール〉. The manual is shared with the RX-650MD below it, publication B64-1198-00, printed 1999. Mounting dimensions are 182 x 53 x 154 mm with a mass of 1.5 kg.

The unit carries no CD transport of its own. The CD player or disc changer named in its title is an external unit operated over Kenwood's changer control, which is what the RD-350 in the paired listing provides.

The MiniDisc transport uses a GaAlAs double-hetero laser diode at 780 nm with an eight times oversampling digital filter and a 1-bit digital-to-analogue converter, running at 800 -> 400 rpm under constant linear velocity. Frequency response is 20 Hz -> 20 kHz within plus or minus 1 dB with 0.5 percent distortion at 1 kHz, 80 dB signal-to-noise, 80 dB dynamic range and 70 dB channel separation. Wow and flutter is below measurable limits. That 0.5 percent distortion figure is the highest quoted for any MiniDisc transport recorded here, two orders of magnitude above the 0.005 percent of the later DPX models.

Sound adjustment is a two-band tone control at 100 Hz and 10 kHz, each across plus or minus 10 dB. Output is model-specific: the RX-750MD is rated at 22W x 4 into 4 ohms at 1 kHz and 1 percent THD with a maximum of 40W x 4, where the RX-650MD is rated at 20W x 4 with a maximum of 35W x 4. The pre-out delivers 1800 mV into 10 kohm with an output impedance of 600 ohm or less.

Supplied parts cover the power harness, four truss screws and one bind screw. No remote control is listed. The tuner is quoted with usable sensitivity measured at a 26 dB signal-to-noise reference rather than the 30 dB reference used by the later Kenwood units, so those figures are not directly comparable.

RX-750MD SPECIFICATIONS
Media	MiniDisc. CD playback requires an external CD player or disc changer under the unit's changer control
FM tuner	76.0 -> 90.0 MHz in 100 kHz steps. Usable sensitivity 0.8 uV/75 ohm (S/N 26 dB), S/N 46 dB sensitivity 1.6 uV/75 ohm, frequency response 30 Hz -> 15 kHz (plus or minus 3.0 dB), S/N 70 dB mono, selectivity 80 dB or more (plus or minus 400 kHz), stereo separation 40 dB (1 kHz)
AM tuner	522 -> 1629 kHz in 9 kHz steps, usable sensitivity 25 uV (S/N 20 dB)
MD section	GaAlAs double-hetero laser diode (780 nm), 8x oversampling digital filter, 1-bit D/A converter, 800 -> 400 rpm constant linear velocity, wow and flutter below measurable limits, frequency response 20 Hz -> 20 kHz (plus or minus 1 dB), THD 0.5% (1 kHz), S/N 80 dB, dynamic range 80 dB, channel separation 70 dB
Audio section	Maximum output 40W x 4, rated output 22W x 4 (4 ohm, 1 kHz, 1% THD). The RX-650MD is quoted at 35W x 4 maximum and 20W x 4 rated. Pre-out level 1800 mV/10 kohm, pre-out impedance 600 ohm or less
Tone control	Bass plus or minus 10 dB (100 Hz), treble plus or minus 10 dB (10 kHz)
Supplied parts	Power harness, truss screws M5 x 6 mm (four), bind screw M4 x 6 mm (one). No remote control listed
Electrical	14.4V (11 -> 16V), maximum current draw 10A
Form factor	Single-DIN, mounting dimensions 182 x 53 x 154 mm, mass 1.5 kg
Source	Kenwood owner's manual, publication B64-1198-00, covering RX-750MD and RX-650MD