The switch box connects to the Bose EQ input so that all sources get EQ'd, and then the EQ connects to any line level input on your receiver (typically the Aux connection). Thus you either need a pre-out/main-in feature, a seperate amp and pre-amp, or you have to use a switch box to connect all of your devices to. Modern receivers no longer have tape recorder connections so there is no "tape monitor" feature. If you don't have a tape deck, the tape connections on the EQ remain unused. EQ connects to tape 1 on the receiver and the tape deck connects to the EQ. The issue became, what if you have only 1 tape recorder connection and no pre-out/main-in? The Bose EQ needs to use the tape recorder connections to route all sound through the EQ, so the EQ has a set of "tape recorder connections" in case you want to use both the EQ and a tape deck. You’d have a range of +/- 24 dB in each band which would cover the full range of the 901 Active Equalizer. Using the tape monitor gets around the problem of not having pre-out/main-in jacks as all other connected devices can be routed to the tape recorder, so the Bose can use the tape deck connections on the receiver but the tape monitor switch needs to be left on all of the time. The Bose 901 Series I and Series II equalizers are interchangeable as they both produce the same frequency response curves, but if you really can’t come up with one, it is possible to use two equalizers daisy-chained together. Many older receivers have one or two tape recorder connections with a "tape monitor" feature that allows you to hear what the tape recorder is recording. The ideal receiver is one with pre-amp out / main in so that all connected sources get EQ'd. The Bose EQ is a line level device, so it just needs a line level signal going in and then feeds the amplifier section, so the EQ'ing is done through the "amplifier connections" on the Bose.
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