Stereo Integrity SIQ 75.4 High-Fidelity 4-Channel Amplifier
Stereo Integrity SIQ 75.4 Amplifier: Purity at its Finest for Your Soundstage
The Stereo Integrity SIQ 75.4 signals the return of true high-fidelity audio engineering to the mobile sound space. Built by audiophiles for the most discerning listeners, this 4-Channel Class A/B amplifier prioritizes signal integrity above all else. Its core design features zero filters, zero crossovers, and zero EQ, delivering a full bandwidth signal (5 Hz to 150,000 Hz) that is clean, precise, and uncompromised. This is the foundation for an accurate soundstage and breathtaking sonic detail.
Uncompromised Audiophile Construction
Every component in the SIQ 75.4 was selected for its acoustic performance and durability:
-
Output Transistors: Utilizes audiophile-grade TO-3 output transistors for clean, linear power.
-
Internal Circuitry: Features high-quality UPC4570 op-amps, IRFPO64N power supply transistors, and sand cast resistors throughout.
-
Connections: Equipped with premium Tiffany-style RCA connections accepting inputs up to 16 Volts.
-
Chassis: Protected by a thick extruded aluminum chassis with a copper anodized shielded transformer cover to minimize electromagnetic interference, all visible through a large plexiglass viewing window.
Clean Power, Ultra-Low Distortion Performance
The SIQ 75.4 delivers precise power with unmatched fidelity, validated by Audio Precision measurements:
-
Rated RMS Power Output (4 Channels): 75W RMS x4 @ 4Ω
-
High Current Output: 120W RMS x4 @ 2Ω
-
Bridged Power: 120W RMS x2 @ 4Ω
-
Total Harmonic Distortion (THD): An ultra-low 0.03 %
-
Signal-to-Noise Ratio (SNR): 90 dB
Installation and Specifications
-
Purity Control: Features a discrete gain knob per channel for precise level matching.
-
Dimensions: Compact size at 14 x 8 x 2 Inches.
-
Current Draw: Maximum current draw of 66 amps.
The SIQ 75.4 is the ideal solution for audiophiles seeking true sound reproduction for their front and rear stage speakers.
Amplifiers Specifications
| Frequency Response Minimum | 5 Hz |
| Frequency Response Maximum |
150,000 Hz |
| Signal-to-Noise Ratio (SNR) | 90 dB |
| Total Harmonic Distortion (THD) | 0.03 % |
| Dimensions (W x H x D) | 14 x 8 x 2 Inches |
| Rated RMS power output into all 4 channels at 4 ohm | 75 Watts |
| Rated RMS power output into all 4 channels at 2 ohm | 120 Watts |
| Bridged RMS power into 2 channels at 4 ohm | 120 Watts |
Power
| Idle Current Draw | 1.2 amps |
| Maximum Current Draw | 66 amps |
Connections
| RCA Input Maximum | 16 Volts |
Description
Stereo Integrity SIQ 75.4 Amplifier: Purity at its Finest for Your Soundstage
The Stereo Integrity SIQ 75.4 signals the return of true high-fidelity audio engineering to the mobile sound space. Built by audiophiles for the most discerning listeners, this 4-Channel Class A/B amplifier prioritizes signal integrity above all else. Its core design features zero filters, zero crossovers, and zero EQ, delivering a full bandwidth signal (5 Hz to 150,000 Hz) that is clean, precise, and uncompromised. This is the foundation for an accurate soundstage and breathtaking sonic detail.
Uncompromised Audiophile Construction
Every component in the SIQ 75.4 was selected for its acoustic performance and durability:
-
Output Transistors: Utilizes audiophile-grade TO-3 output transistors for clean, linear power.
-
Internal Circuitry: Features high-quality UPC4570 op-amps, IRFPO64N power supply transistors, and sand cast resistors throughout.
-
Connections: Equipped with premium Tiffany-style RCA connections accepting inputs up to 16 Volts.
-
Chassis: Protected by a thick extruded aluminum chassis with a copper anodized shielded transformer cover to minimize electromagnetic interference, all visible through a large plexiglass viewing window.
Clean Power, Ultra-Low Distortion Performance
The SIQ 75.4 delivers precise power with unmatched fidelity, validated by Audio Precision measurements:
-
Rated RMS Power Output (4 Channels): 75W RMS x4 @ 4Ω
-
High Current Output: 120W RMS x4 @ 2Ω
-
Bridged Power: 120W RMS x2 @ 4Ω
-
Total Harmonic Distortion (THD): An ultra-low 0.03 %
-
Signal-to-Noise Ratio (SNR): 90 dB
Installation and Specifications
-
Purity Control: Features a discrete gain knob per channel for precise level matching.
-
Dimensions: Compact size at 14 x 8 x 2 Inches.
-
Current Draw: Maximum current draw of 66 amps.
The SIQ 75.4 is the ideal solution for audiophiles seeking true sound reproduction for their front and rear stage speakers.
Amplifiers Specifications
| Frequency Response Minimum | 5 Hz |
| Frequency Response Maximum |
150,000 Hz |
| Signal-to-Noise Ratio (SNR) | 90 dB |
| Total Harmonic Distortion (THD) | 0.03 % |
| Dimensions (W x H x D) | 14 x 8 x 2 Inches |
| Rated RMS power output into all 4 channels at 4 ohm | 75 Watts |
| Rated RMS power output into all 4 channels at 2 ohm | 120 Watts |
| Bridged RMS power into 2 channels at 4 ohm | 120 Watts |
Power
| Idle Current Draw | 1.2 amps |
| Maximum Current Draw | 66 amps |
Connections
| RCA Input Maximum | 16 Volts |
