Monster Power PRO 7000 Owner's Manual page 9

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MONSTER'S PATENTED CLEAN POWER STAGES
Each PowerSource has its own Clean Power stage. Clean Power performs two tasks that are vital
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to high-performance analog, computer and digital reproduction: filtration and isolation. The higher the Clean Power
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stage number, the more sophisticated and advanced the filters. Also, the higher the number, the greater the isolation
between connected equipment for maximum component-generated noise rejection. In addition, the PRO7000 features
Clean Power Stage 5 with a pair of triple-shielded isolation transformers for the best possible performance.
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What exactly is Clean Power Stage 5? It's five ultra-advanced isolation filters that include two separate
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digital filters to accommodate a pair of digital sources, plus analog, computer, and ultra-high-current audio filters
for the best AC power line noise rejection and inter-component isolation making it ideal for studio
and professional systems.
MONSTER'S CONFIGURABLE NOISE REDUCTION ISOLATION TRANSFORMERS
First, it's important to understand that the power company's 120V AC power is delivered unbalanced, with neutral
connected to ground. Special triple-shielded isolation transformers were designed for the PRO7000, configurable
in two ways. A switch on the rear panel selects between the two Noise Reduction Modes.
Normal Isolation Mode disconnects or "floats" neutral from ground while knocking down noise with Clean Power
Stage 5 filters. Balanced operation makes use of the Stage 5 filters, but activates a center tap on the transformer
secondary output. For the technically-minded, "balanced" means the transformer outputs +60 to -60VAC (volts AC)
with respect to ground. That's why Balanced isn't isolated from ground, and why, if your system isn't very carefully
set up to eliminate ground currents, you may hear hum and buzz from your speakers. This is especially true for systems
adding video to audio, where it's common to discover "dueling grounds". Balanced configuration can offer lower noise
because of the topology's inherent noise-cancelling behavior, or CMR (Common Mode Rejection). Improvements
from balanced running can be most easily perceived in complex CI installations using all-balanced power supplies.
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