The Specs

System Components

System Components: 6.5" (165mm) Subwoofer Driver, 2.5" (65mm) Wideband satellite drivers (five)
Frequency Response: 55 Hz to 18khz (+/- 3dB @ 1Watt/1 Meter)
Maximum SPL: 100dB @ <10% THD/1 kHz
Amplifier Type/Design Features: Class A/B Hybrid-Monolithic Design, Proprietary CM-7 Interface, UL 94V-0 Spec Printed Circuit Boards, Redundant Protection Circuits (Thermal, Short-Circuit, Under/Over Voltage), Gold-Plated Inputs and Outputs, and Mute/Power Circuits.
Amplifier Power: 100 Watts RMS (1x50 watts, 5x10 watts) 50Hz to 20kHz, all channels driven, 8 ohms @ <0.1% THD
Input Impedance: >50k Ohms @ 1kHz, < 200pf @ 20kHz
Maximum Input: 8V (peak-to-peak, before input clipping)
Dynamic Headroom: > 2dB
Inputs: Gold-plated RCA jack
Outputs: 5 channel terminal; left and right satellite speaker via push terminals
Subwoofer: 165mm Poly Laminated Paper Cone with 25mm ASV Composite Former, Shielded Magnet Structure
Subwoofer Enclosure: 13.40"H x 8.70"W x 13.50"D, Rigidly braced MDF, computer-optimized front-firing vented design with turbulence-free port and non-removable fabric grille
Satellite Drivers: 65mm Computer-optimized wideband paper cone drivers, rare earth neodymium magnet structures (inherent magnetic shielding)
Satellite Enclosures: 3.9"H x 3.3"W x 4.2"D, Two-piece molded, dual-slope ellipsoidal acoustic suspension design, embedded 1/4"-20 threaded inserts (for optional mounting brackets) and decorative, non-removable cloth grilles.
Crossover Networks: Active, 2nd Order high Pass (satellites)/Low Pass (Subwoofer)
Crossover Frequency: 150Hz subwoofer
Control Module: 1.7"H x 5.8"W x 3.1"D, Functions - volume, balance, bass, fade, treble, power, mute

Volume control: 100dB
Balance control: >50dB Isolation @ Maximum Left-Right Rotation
Bass control: +/- 12dB @100 Hz
Treble control: +/- 12dB 2 10 kHz
Input Isolation: >90 dB
Signal to Noise Ratio: >80dB (A-weighted)

The speakers

I love it when a manufacturer isn't afraid to share all their test results with the consumer. MidiLand has always had one of the most comprehensive specification pages in the industry. All of the above information was found on the back page of the owner's manual.

Important specifications that deserve our attention include the 100dB maximum SPL. This compares to 110 dB for the class leading, 400 watt Klipsch ProMedias. Nevertheless, extended listening at sound pressure levels anywhere close to 100dB will guarantee long-term permanent hearing loss.

What this means is that, on paper, the S4-7100s should provide more than enough volume for an average sized room. In this case, the theoretical performance matches what we tested - the S4-7100s can play loud.