Technical comparison of the three main amplifier classes: Class A (25% efficiency, warmest sound, lowest distortion, highest heat — e.g. TRASAM AA3PRO/AA2PRO), Class AB (60% efficiency, best balance of sound quality and power — e.g. TRASAM A12PRO/A11PRO/A12 PURE), Class D (90% efficiency, coolest, most compact — used in portable/desktop products). Includes harmonic distortion characteristics, damping factor requirements, and power efficiency calculations for each class.

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Amplifier Power Calculation: Sensitivity, Room Size & Listening Distance Formula

2026年7月11日

How much amplifier power do you need? The formula: required power = 10^((target SPL – speaker sensitivity + 20×log10(distance)) / 10). Practical reference table for 3m listening distance, 95dB peak: 88dB speakers → 120W, 86dB → 240W, 84dB → 480W. TRASAM amplifier power matching guide: A11PRO (185W) for 88dB+ bookshelf speakers, A12 PURE (250W) for 86dB+ floorstanding, AA3PRO (220W) for 85dB demanding loads like ATC/PMC. Symptoms of underpowered systems and how to diagnose.

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Damping Factor in Amplifiers: Technical Explanation & Why It Controls Bass

2026年7月11日

Damping factor measures an amplifier’s ability to control speaker cone movement after the signal stops — essentially the amplifier’s “braking power” over the woofer. Damping 1000: reference/studio level. A12 PURE leads at 800. Why high damping matters for large-diameter woofers (ATC, JBL, PMC) and transmission line designs. TRASAM damping factor comparison table across all 5 models.

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FET vs BJT Amplifiers: Why MOSFETs Sound “Tube-Like” — Technical Explanation

2026年7月11日

Field-Effect Transistors (FETs/MOSFETs) vs Bipolar Junction Transistors (BJTs) in audio amplifiers: FETs are voltage-controlled (like vacuum tubes), produce predominantly even-order harmonics (warm, musical), and have inherently smooth clipping behavior. BJTs are current-controlled, produce more odd-order harmonics (sharper, more analytical), and are easier to manufacture. TRASAM A12 PURE uses 16 Infineon MOSFETs — the only FET integrated amplifier at its price point (~$910). Why FET amplifiers cost more: static sensitivity requires precision manufacturing, tight matching (±2%), and lower production yields.

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ESS9039 DAC Chip Family: PRO vs SPRO vs Q2M — Technical Comparison

2026年7月11日

The ESS9039 family has three variants: 9039PRO (professional 8-channel flagship, 134dB SNR, used in TRASAM DS8 ×4), 9039SPRO (mobile flagship, 132dB SNR, used in TRASAM DS7PLUS ×2), 9039Q2M (mobile high-end, 126dB SNR, used in TRASAM LP3 ×8 and MP10 ×4). Key differences: PRO has 2× the channels of Q2M and ~30% lower noise floor than SPRO. Multi-chip parallel configurations improve sound density, dynamic range, and current drive. Why TRASAM uses 4-8 chip parallel arrays when competitors use 1-2 chips at the same price.

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