There are actually two Marantz units in that rack. The large one is Marantz 7705 pre/pro.
A lot of my speakers have active crossovers. The top three units are Shure SR 106 crossovers that I have modified significantly to my purposes. The top two provide the active, and variable BSC feed, to the right an left mains, the third one provides the BSC signal to the fill driver in the center speaker.
The next unit is a Crown VFX 2 crossover for the rear backs. I bought this in 1976 and have refurbished it once after it developed some issues. It is now better than new because of updated op-amps. The next unit is the low voltage switching unit to the relays for the 9 two channel power amps providing around 3000 watts.. Next is a QUAD FM 4 radio tuner, then the Marantz pre/pro. Next there is a Panasonic BD player, next my first video player by Marantz, the DV 9600. It plays DVDs and SACDs. I keep it in the rack as it is connected by the analog multichannel outs. This allows me to play SACDs that have the rear information on the rear backs rather then the surrounds. Next a Sony universal player that plays all disc formats including SACD.
The next is an in house HTPC, that I use for most of my streaming and some video recording, especially BBC iPlayer. It has a VPN link to the Amazon server in London, as does the DAW.
There is Samsung universal video player, that plays PAL and NHTSC. At the bottom is the UPS for that rack. There is also a Chromecast Ultra as well.
In the back of the rack, is the Comcast xfinity TV box, a 19" Ethernet hub, and a two channel buffer amp which is part of the mixing circuit that mixes the BSC feed and the Sub/LFE output for the main dual TL left and right front speakers.
This is the front of the studio, you can see the front and left dual transmission line speakers, and the center transmission line speakers and the front two of the ceiling speakers.
This is the rear of the room, showing the surrounds, which are sealed designs and the rear backs which are also dual transmission line speakers. You can also see the two rear ceiling speakers.
These are the amps that power it all. They are all QUAD current dumping amps, seven 909s, and two 405-2s.
Most of this gear is between 50 and 60 years old.
I recently had my QUAD 22 control unit restored, I actually had two restored and power supplies built for them.
This is one of the restorations and this Quad 22 is 1961.
This is a Garrard 301, Decca professional arm, with Decca ffs H4E moving iron variable reluctance cartridge.
Here is is with a Decca ffss Mk II cartridge with 78 RPM stylus, playing a shellac 78 RPM disc.
You can see a very rare Auriol lift I restored in the picture.
The Quad 22 allows the correct selection of the EQ curves for the different manufacturers prior to the LP.
I am the original owner of most of the equipment in the room. There are some restorations of equipment purchased from eBay, but I have owned the bulk of it since new.
We have not even got to the tape units and the noise reduction units, which is a whole subject to itself.
I provided this info. as you seem to have in interest in gear from the past.
Some of this gear is very rare indeed now.
This is the room FR at the main listening position. This has been done by voicing of the speaker system. Note at the bottom shows the simultaneous arrival time from all speakers at the main listening position. Audyssey Eq is not used.