Marantz 4240

Marantz 4240


The Marantz 4240 is one of their Quadraphonic offerings in the 4xxx series. The Model 4240 is a high quality stereo + quadradial receiver and incorporates Marantz’s exclusive Vari-matrix circuit which simulates 4-channel sound from normal 2-channel stereo programs, and is capable or reproducing 4-channel sound from any matrix encoded source. It can also reproduce any discrete 4-channel program as well as regular stereo and monaural programs. An optional plug-in decoder adapts the 4240 for any specific matrix system such as Columbias SQ.


Marantz 4240 Left


The 4240 debuted in 1974 and was on the market until 1978.  The receiver had a retail price of $599.95. It had options for an SQA1 Quad Decoder and the SQA2 Quad Decoder as well as the RC4 Remote Control.  Of course you could also purchase the WC-22 wood cabinet. With the mode selector you could choose between Mono, 2 Channel, Discrete, Vari Matrix or SQ Decoder modes. The 4240 also has a Dolby selector on the front panel.


Marantz 4240 Right


The Gyro Touch tuning flywheel was used in this model as it was in many of the Marantz models of that era. While not overly powerful the 4240 put out 40 watts per channel in 2 channel mode and 17 watts per channel in quad mode. The 4240 is not really known as one of Marantz’s better receivers but, of course, that is relative to their other high quality models.  It doesn’t have a protection relay in it so your speakers and the outputs are only protected by fuses which isn’t optimal. The output transistors are TO-66 case transistors which are not really sufficient and are no longer available either.


Marantz 4240 Back


Despite its shortcomings the Marantz 4240 Quadradial does have followers. Of course, any quad collector would want one. They sell for about $250.00 to $400.00.

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Pioneer QX-949

Pioneer QX-949


The Pioneer QX-949 is one of Pioneer’s larger quadraphonic receivers and was top of the line when it was introduced in 1974. This was mainly due to the fact that it had essentially all the available decoding built in to it. It has a built in CD-4 demodulator as well as regular matrix and SQ matrix. So there was no need for the audio enthusiast to have to buy a separate demodulator or decoder.


Pioneer QX-949 Left


The QX-949 puts out a pretty decent 40 watts per channel into 4 channels and 60 watts into 2 channels. It also has a plethora of inputs and outputs and can handle 4 pair of speakers including two pair in the back and two in the front. It has inputs fro three tape decks, two turntables as well as another auxiliary source.


Pioneer QX-949 Right


The tuner section featured a 4-gang variable capacitor and phase linear ceramic filters that gave it great sensitivity and selectivity. Other features of the tuning section are:


  • FM front end with MOS FET
  • Local oscillator with buffer circuit (QX-949 A)
  • Excellent phase linearity and high selectivity.
  • High performance multiplex integrated circuit.
  • Effective FM muting switch.
  • Linear FM dial scale and tuning meter.
  • Outstanding AM section



Pioneer QX-949 Back


A distinguishing feature of the QX-949 is the 4-channel level indicator. It basically is an illuminated meter that shows adjustments that are made when listening to a 4 channel source. It shows both front speakers and both rear speakers.  Pioneer even added a 4 CH-MPX out terminal in anticipation of 4 channel FM broadcasting occurring in the future.


Pioneer QX-949 Inside


Overall, the Pioneer QX-949 is quite a quad receiver and it is very popular among qad collectors today. In good working condition they can sell from about $200.00 up to $400.00 or more for a mint receiver.

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