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The rear-panel switches accommodates either professional +4 dBu or consumer -10 dBV nominal operating ranges. The +4 setting switches the operating rage upwards and can handle a signal that is 15+ dB stronger than the -10 setting (see graph below).

The two ranges can be thought of as an internal gain structure. Since there is such a severe difference between pro and consumer signal levels, one gain structure cannot be optimized for both ranges. In other words it’s impossible for the equalizer to deliver, at the same time, the best headroom and the lowest noise floor from a single internal gain structure. The higher-level (professional) +4 dBu range will have the best headroom, while the lower (consumer) -10 dBV range delivers the quietest noise floor. (The range settings on a SPL meter operate the same way, providing a balance between the mic pre amp’s noise level and the expected volume of the signal being measured.)

However, some AV receivers have sub output levels that are strong enough to surpass the capabilities of the -10 dBv setting. If that's the case you need to switch to +4.

Sorry, can’t tell you anything about the signal bleeding issue.

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