Model 301 Technology
Capable of twice the total current throughput of the Model 312 stereo, the Model 301 is configurable in a series to maximize voltage and impedance for high efficiency speakers. In parallel configuration, it minimizes output impedance and maximizes current and damping factor for low to medium efficiency speakers.
Model 301 features a sophisticated mono front end: an isolation transformer, active Power Factor Correction (PFC) current rectification unit followed by a capacitor-based DC power buffer, and an advanced proprietary highly regulated, very high speed and low noise switch mode power supply. An ICEpower 1000 ASP differentially balanced module complements the design of its core, while its inputs and outputs are coupled to precision custom-wound Lundahl transformer for maximum signal isolation and interface compatibility.
Model 301 Features
Monoblock 600 Watts, 90 Amp design, maximizes performance and channel separation.
Housed inside Elegant, ultra-low resonance, structurally rigid chassis that are precision-machined from solid blocks of aircraft grade 6061-T6 aluminum that are completely sealed for trouble-free operation and high RF and EMI isolation.
Configurable for higher and lower efficiency speakers: parallel operation mode yields maximum current and high damping factor, combined with low output impedance for speakers with input impedance between 2 and 8 Ohms; series configuration mode yields maximum voltage and high output impedance for speakers with input impedance higher than 8 Ohms and up to 16 Ohms.
Massive universal AC input 1200W Active Power Factor Correction (PFC) based current rectification sub-system, converts noisy AC power into supremely quiet and smooth DC high voltage. AC line harmonic noise pollution is virtually eliminated, and power utilization efficiency is increased to 99%, resulting in exceptional nimbleness and refined musicality.
Power supply efficiency
Custom multi-regulated, extremely high speed, vanishingly quiet switch mode power supply ensures consistent performance under all operating conditions.
Balanced input and output topology, including active positive and negative leads on Cardas output terminals for optimum speaker control, yields high common rejection ratio of 90dB over 20 to 20 KHz audio frequency band.
Line level transformer-coupled IO
Transformer coupled inputs provide universal compatibility with other components and eliminate ground loop noise and EMI, while transformer coupled outputs produce ideal amplifier-to-loudspeaker impedance, damping, and current matching.
Momentary contact switch on front panel and 12V remote jack on back plane quietly cycle Model 301 from power-saving standby to full power.
Output circuit protection
Avoids damaging shorts when speaker wire leads come into contact with each other.
Fail-safe operation provided by user-resettable thermal circuit breaker located on rear panel.
Internally selectable overall gain of 26 or 32 dB.
Three-point self-leveling chassis support and Sorbothane compliant pads.
20-Amp female IEC AC power connector.
Grounding post for star-grounding and other advanced configurations.
Model 301 Specifications
|Output Power @ 8 ohms||Continuous RMS 1800/600 watts (ser/par)|
|Output Power @ 4 ohms||Continuous RMS NA/1200 watts (ser/par)|
|Frequency Response||10 Hz - 60 kHz, 3dB|
|Peak Output Current||> 90 amps|
|Dynamic Range||120 dba|
|THD + Noise, 0.1W-500W/4 ohm||typ. .006% @ 1kHz|
|CCIF Intermod. Dist., 19/20kHz||< .002%|
|Common Mode Rejection Ratio||>90dB, 20 Hz 20 kHz|
|Amplifier Weight||80 lbs each|
|Amplifier Dimensions||10.6" x 15.5" x 18.3"|
Model 301 Mono
With its configurable ability to drive low and high impedance speakers alike with a perfect combination of finesse and control, the Model 301 delivers the true Rowland character. Musical authority and dynamics with a superb frequency extension deliver sound to a vast three-dimensional stage. The resolving power to recover the finest sonic details and exceptional transparency is complemented with a complex exposure of the music’s harmonic structure, and the sweet texture of the treble.
Rather than taking the easy way out, and giving the Model 301, a deceptively pleasing colored patina of euphonic warmth, Jeff Rowland has chosen a way less travelled, and has instilled in this amplifier, an agile, sensuous, and neutral musicality. This reference level instrument for music reproduction is created to the exacting Rowland artistic and engineering standards that have consistently turned technological innovation into heirlooms. Unsurprisingly, music lovers the world over choose the Model 301 monoblock power amplifier over “cost-no-object” amplifiers, regardless of their underlying technology.