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SIQ 125.4 (Class A/B)
Discover our SIQ amplifiers: a blend of Hi-Fi class A/B & D backed by 25+ years of audiophile expertise. Boasting top-tier components for crystal-clear sound, we offer these gems directly to you for exceptional value. Experience pristine power, from SIQ 75.4 to the robust SIQ 3000 D.
Description
Hi-Fi class A/B and class D amplifiers are back with our SIQ amplifiers. Full bandwidth, zero filters, discrete gain knob per channel, zero crossovers, zero EQ. Purity at its finest. Being avid audiophiles for over 25 years we have always appreciated the finer performing amplifiers in mobile audio and with our growing presence in the mobile audio industry, we have been able to team up with talented amplifier engineers and finally produce our own hi-fi amplifiers. Audiophile components were used throughout construction and engineering to bring our amplifiers to fruition. And because we are a direct company (no dealers) the cost savings are passed directly to you, our customers.
All of our SIQ class A/B amplifiers utilize audiophile-grade T0-3 output transistors, clean board layouts, thick extruded aluminum chassis, copper anodized shielded transformer covers, and a large plexiglass viewing window. Coming inward we use UPC4570 op-amps followed by IRFPO64N power supply transistors, sand cast resistors, surface mount parts to save board space, and Tiffany-style RCA connections. All of the above FR and power graphs are from Audio Precision measurements.
Amplifiers Specifications
Quick Info
| Frequency Response Minimum | 5 Hz |
| Frequency Response Maximum | 150,000 Hz |
| Signal-to-Noise Ratio (SNR) | 91 dB |
| Total Harmonic Distortion (THD) | 0.01 % |
| Dimensions (W x H x D) | 16.5 x 8 x 2 Inches |
| Rated RMS power output into all 4 channels at 4 ohm | 125 Watts |
| Rated RMS power output into all 4 channels at 2 ohm | 200 Watts |
| Bridged RMS power into 2 channels at 4 ohm | 400 Watts |
Connections
| RCA Input Maximum | 16 Volts |
Power
| Idle Current Draw | 1.6 amps |
| Maximum Current Draw | 98 amps |
1 review for SIQ 125.4 (Class A/B)
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Bill –
I have 3 of these bad boys. The 75.4, the 125.4 and the 1500d and am impressed beyond words how amazing they are. Tonally transparent, very powerful, supremely clean, very small power consumption and they are just beautiful pieces. Everyone that has seen them has said the same thing “Those are beautiful!” I replaced my Helix amps with them and it was the best move I could have made. They are every bit as clean and powerful as my old Mosconi Zeros and Sinfoni amps but for 1/4 the price (or less). I have 2 more cars to upgrade and there is no doubt they will be getting SIQ amplifiers as well. I have never tested and amp so powerful and clean at this price point much less one thats 10x more that I liked better. You simply cant go wrong if you just want clean and pure amplification.