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Saturday, December 17th, 2011
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Marantz Home Theater Gear

Canon EOS 50D, Sigma 30 mm ƒ/1.4 lens @ ƒ/16, ISO 400, six seconds exposure using full manual, tripod. Cropped and white balanced using Aperture 3.

This is our home theater core; a Marantz AV7005, which is a preamp / processor unit, and nine MA700 monoblock amplifiers configured for 2,000 watts RMS.

The AV7005 is a current (as of the end of 2011) model; the MA700's are a generation back, but still work with the AV7005's remote control system (D-Bus.)

I've set it all up as a 7.1 system with center, fronts, surrounds and backs at 8 ohms and 200 watts RMS each, while the sub is a pair of series-parallel units presenting eight ohms, with a bridged pair of MA700s dedicated to them capable of 600 watts RMS.

I wasn't actually ready to go and do this, but our Denon receiver in the library was "gifted" with some cat vomit through the top cooling vents; I didn't know it had happened, because the back of the receiver was through-wall and in a closet. So the Denon just kept on working until eventually, the acid in the vomit actually ate through some of the Denon's wiring. Nice, eh? Silly cat. So the Denon went downstairs into my shop, where it will likely sit until the weather warms up (our basement is cold! [finally got around to fixing it, March of 2013]), my Sony receiver moved from the theater to the library, and I picked up the Marantz gear to serve in the theater. I can't say I'm depressed over the upgrade, but this wasn't exactly how I thought it would come about. 😊

The AV7005 is an 9.1 / 7.1 / 5.1 / stereo preamp-processor. It offers USB, XPort, six HDMI inputs, two HDMI outputs, four component inputs, two component outputs, five composite inputs, three composite outputs, two coaxial audio inputs, two optical audio inputs, an optical audio output for recording, a 7.1 channel "aux" input, AM, FM, HD/AM and HD/FM, Internet radio, Pandora client, UPNP / DLNA media client, Rhapsody client, iPod/iPad client, Sirius satellite radio client, Apple Airplay client, USB media client, balanced and unbalanced outputs, D-Bus remote control, RS-232 remote control for automation, and 12v trigger in and out for things like screen drop/retract automation, dual front panel displays (one may be hidden), and an illuminated learning remote. It pulls about 60 watts maximum, or 0.2 watts on standby, with a linear power supply that eliminates RFI problems associated with switchers. It uses a wired Ethernet connection for its network functions, may be configured for DHCP or static network connections, and can be remote controlled from a web page provided by an on-board web server, or via a telnet connection if you want to handle things programmatically. Both full-page and iPod sized web control systems are provided. It can drive two video zones and three audio zones. It features Audyssey room measurement and compensation, along with by-mode and by-input channel level, tone and equalization. It also has a built-in high end headphone amp (very useful on a unit that has no main amplifiers.) DTS: [True HD Master & High Res. Audio/ES/96/24/Discrete&Matrix6.1/Neo:6/Express] Dolby: [True HD/Digital Plus&EX/Pro Logic IIz, IIx, II/Virtual Speaker/Headphone] SACD decode. 192 kHz / 24-bit D/A and A/D conversion. Freq. Response 10 Hz-100 kHz +1/-3 dB. FM mono, 78 dB s/n. FM stereo, 68 dB s/n. HD radio (AM or FM) 85 dB s/n. Component video response, 5 Hz-60 MHz, +0/-3 dB. 22 lbs. Marantz provides a 3-year warranty for the unit to the original purchaser. An optional add-on, the RX101, allows the AV7005 to serve as a bluetooth client. System firmware upgrades are done via Ethernet, and take about five minutes on my 30 Mb / sec connection.

200 watts RMS into 8 ohms, 300 watts RMS into 4 ohms, or 600 watts RMS, bridged pair, into 8 ohms. Maximum .02% THD at full rated power, or less. Similar amplifier topology to the Marantz 15 amplifier designed by Sid Smith, except the MA700 adds a JFET differential pair cascoded with bipolar devices. D-Bus remote control; THX reference gain setting, THX certified. Unbalanced inputs, binding post outputs. Frequency response is -0.1 dB at 10 Hz, -0.07 dB at 20 kHz, and -0.5 dB at 85 kHz, all measured at one watt. Channel separation is unmeasurable and channel power vampirism is zero ( monoblocks FTW ), noise is 110 dB down. Absolute noise floor with input shorted is in the 5-75 uV range up to 200 KHz, except between 10 Hz and 40 Hz, where it is in the 420 nV to 4 uV range. Outputs are triple-parallel bipolar power devices. Power supply is classical linear, so no RFI issues. Protection is smart, with the amp choosing between protection options that include a lower voltage output winding on the power transformer, muting, speaker disconnection, or AC disconnection, depending on the problem type. Sensors monitor DC levels in the signal path, output voltage, and amplifier temperature. D-Bus remote start incorporates a 100 mS delay before passing the signal on, resulting in time-sequenced power up of multiple amplifiers and consequent lower peak source current draw. Standby (red), operate (green), settling (flashing green) LED indicators and hard power switch on front panel.

Configuring two MA700's as a bridged pair is easy: Using the provided switch, set one as master, the other as slave; plug the master's inverted audio output into the slave's normal audio input; jumper the (-) speaker terminals together; wire the speaker (+) to the master (+) and the speaker (-) to the slave (+), plug the preamp output into the master's audio input, and you're done.

#audio #theater #marantz


Width: 2724
Height: 1436
Company:  Canon
Camera:  Canon EOS 50D
Shot On:  2011:12:17 16:43:04
Aperture:  ƒ/16.0
Focal Length:  30.0mm
Metering Mode:  Spot
Exposure Mode:  Manual
Flash:  Did Not Fire
Exposure Time:  6.0 seconds
Exposure Program:  Manual
ISO:  400

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