What makes amplifiers from Jeff Rowland Design Group different from many other Class D amplifiers is not just the Class D module itself — it is the overall implementation, power supply design, analogue stage tuning, mechanical construction, and voicing philosophy.
Some key differences:
- Power supply quality
Jeff Rowland places enormous attention on the power supply:
- very low-noise switch-mode supplies
- heavy filtering
- sophisticated regulation
- excellent grounding architecture
Many cheaper Class D amplifiers use off-the-shelf modules with simpler power supplies. The PSU quality strongly affects:
- smoothness
- tonal density
- soundstage depth
- treble refinement
This is one reason Jeff Rowland Class D often sounds less “digital” or “sterile.”
2. Analogue-like voicing
Many listeners describe Jeff Rowland sound as:
- fluid
- relaxed
- refined
- dimensional
- musically dense
Jeff Rowland tunes the input stages and overall circuit for a more natural presentation closer to good Class A/AB sound.
3. Chassis and vibration control
Their chassis machining is unusually elaborate.
The thick aircraft-grade aluminum chassis:
- reduces vibration
- shields noise
- improves thermal stability
This contributes to black background and microdetail.
4. Module implementation matters more than module brand
Two amplifiers using the same module can sound very different depending on:
- input buffer stage
- PSU
- grounding
- output filtering
- PCB layout
- isolation
Jeff Rowland’s execution is considered among the more refined implementations.
5. Focus on low listening fatigue
A major strength of Jeff Rowland Class D:
- long listening comfort
- smooth highs
- natural midrange textures
Jeff Rowland products are also famous for:
- precision machining
- jewel-like finishing
- minimalist industrial design
The physical craftsmanship is far above typical Class D products.
Features
- XLR input connectors for balanced system configuration.
- RCA input connectors for unbalanced system configurations.
- Dual Speaker Output Terminals on each channel for bi-wiring applications.
- User selectable switching between balanced and unbalanced connections.
- Transformer coupled inputs provide universal compatibility with other components and eliminate ground loop noise and EMI.
- High efficiency ICEpower@ power conversion technology generates high output power with very little heat.
- Fully-balanced topology implemented in both input and output circuitry.
- Power Factor Correction (PFC) in power supply reduces AC line harmonic noise pollution and increases AC line power utilization to 99%.
- Proprietary switch-mode power supply technology ensures consistent performance under all operating conditions.
- 12V remote ON/OFF remote power switching via 1/8” jack on rear panel.
- Standby power mode reduces warm-up time.
- CE approved speaker output terminals require no tools for secure, low resistance connections.
- Fail-safe operation provided by user-resetable thermal circuit breaker located on rear panel.
- Quiet, transient-free operation during power ON/OFF and input configuration switching.
- Selectable overall gain of 26 or 32 dB.
- Ultra-low resonance, structurally rigid chassis, precision-machined from a solid block of aircraft grade 6061-T6 aliminum.
- 3-point self-leveling chassis support.
For more information:
- Contact : Dicky Ng 012-3308893
- Contact : John Yew 016-2861000
- Email : [email protected]
| Weight | 38 kg |
|---|
Specification
|
Frequency Response
|
5 Hz – 45 kHz, -3 dB @ 8 ohms
|
|
Peak Output Current
|
40 amps
|
|
Dynamic Range
|
120 dBa
|
|
Load Impedance Range
|
2 ohms – 16 ohms
|
|
Input Impedance
|
40k ohms
|
| THD + Noise | 0.1 watts – 500 watts, 4 ohms < 0.1%, Typically .01% @ 1 kHz |
|
CCIF Intermodulation Distortion
|
19/20 kHz < .002% |
|
Damping Factor
|
1 kHz > 1000
|
|
Outputs
|
2 pair Parallel Binding Posts per channel |
|
Power Consumption
|
Idle – 35 watts, Maximum – 2000 watts
|
|
Amplifier Weight
|
70 lbs. / 32 kg
|
|
Amplifier Shipping Weight
|
83 lbs. / 38 kg
|
|
Overall Amplifier Dimensions (H) x (W) x (D)
|
10.5” x 15.5” x 18.3” 267mm x 394mm x 465mm
|
Be the first to review “Jeff Rowland
Model 312
Stereo Power Amplifier
(Made In USA)
(New Was RM58250)”
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