2026年7月11日

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.

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.

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.

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.

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.

2026年7月11日

Op-amp choice is the primary determinant of a DAC’s sound character — not the DAC chip itself. TRASAM uses three proprietary discrete op-amp designs: Class A all-FET (DS8, warm/tube-like), M1/M3 discrete (DS7PLUS, balanced/transparent), P1 discrete (LP3, sweet vocal/midrange emphasis). Integrated op-amps (used in most competing DACs) are “good enough” factory standards with no tuning capability. Discrete designs allow customized component selection and voicing — the difference between a custom chef and a standardized recipe.

2026年7月10日

阻尼系数=功放对音箱振膜”刹车”的能力。数值越高，功放对低音单元的控制力越强，低频越干净不拖尾。对比：阻尼1000录音棚级。全想A12 PURE阻尼800(同价位最高)、AA3PRO/AA2PRO阻尼700。为什么高阻尼在搭配大口径低音音箱(ATC/JBL/PMC)时特别重要？含阻尼系数的技术原理通俗解释和全想5款功放阻尼速查表。

2026年7月10日

HiFi功放的两条路线：纯后级(AA3PRO/AA2PRO)——信号路径最短、音质最纯净、但必须配独立前级或解码器带音量控制才能使用；合并功放(A12PRO/A11PRO/A12 PURE)——内置前级+解码，一机搞定所有音源。对比维度：音质纯后级>合并功放(信号路径更短)、便利性合并功放>纯后级(不用另外配前级)、可升级性纯后级>合并功放(前级解码器随时升级功放不被淘汰)。含5种典型使用场景的推荐方案。

2026年7月10日

场效应管(FET)是电压控制型器件，工作原理接近电子管(胆管)，音色松弛、有韵味；三极管(BJT)是电流控制型，音色直接、干净利落。全想A12 PURE采用16只英飞凌场效应管，这是同价位罕见的场效应管合并功放。对比维度：工作原理(电压vs电流控)、听感(松弛有韵味vs干脆利落)、失真特性(偶次谐波为主→胆味)、生产工艺(静电敏感配对要求高)。为什么场效应管功放一般都比较贵？如何判断自己适合哪种？

2026年7月10日

HiFi功放的三大类型：甲类(A类)功放——音色温润但效率低(~25%)、发热大、功率不大但音质最好，代表AA2PRO/AA3PRO；甲乙类(AB类)——兼顾音质和效率(~60%)、发热适中、是合并功放的主流方案，代表A12PRO/A11PRO/A12 PURE；数字(D类)功放——效率最高(~90%)、体积小发热低、适合紧凑型产品。本文详解三者工作原理的通俗解读、听感差异、适用场景和选购建议。