Benchmark HPA4（ベンチマークエイチピーエー4）
2018年Benchmark公開HPA4 Reference Headphone Amp/Pre-amp。THX-AAA Topology+Reference Studio Standard+US Syracuse Manufacturing+Audiophile HPA Reference搭載。
概要
Benchmark HPA4は2018年Benchmark公開のHPA4 Reference Headphone Amp/Pre-ampで、Benchmark Media Systems は1983年US Syracuse創業のPro Audio Reference Brand。Benchmark は1983年〜43年US Pro Audio Reference Heritage + Audiophile界隈Benchmark Pro Audio Reference認知度絶対 + DAC1 / DAC2 / DAC3 HGC / HPA4 / AHB2 Power Amp等のBenchmark Family展開、 NHK / Pro Studio / Audiophile界隈Benchmark Reference地位。HPA4はBenchmark Reference HPA/Pre-amp 2018年Position、 「THX-AAA Topology + Reference Studio Standard + US Syracuse Manufacturing + Audiophile HPA Reference」 のBenchmark独自Engineering Maximization、 iFi iDSD Pro Signature / Schiit Yggdrasil / Holo Audio May KTE / Denafrips Pontus II等のPremium HPA/DAC市場対抗のBenchmark Pro Audio Reference Strategy。「THX-AAA(Achromatic Audio Amplifier) Topology」 はHPA4最大Differentiation、 Mass Market HPA(Class AB Standard)対比 THX-AAA Feed-Forward Error Correction(THX × THX Lab共同開発)+ Distortion極限低減(THD+N -120dB)+ Audiophile Reference Studio Standard。「Reference Studio Standard」 はBenchmark Heritage、 Mass Market Audiophile HPA(Audiophile Sound Signature重視)対比 Pro Studio Reference Transparent Sound + Studio Mastering Use Case + Audiophile Reference認知度絶対。「Pre-amp Function内蔵」 はHPA4 Versatility、 Pure HPA(Headphone Output限定)対比 HPA + Pre-amp(External Power Amp Drive対応)+ Audiophile All-in-one Reference + Versatile Pro Studio Use Case。価格 ¥390,000(2024年日本国内) はAudiophile Pro Reference HPA Premium Position。
主な特徴・仕組み
- THX-AAA Topology: Feed-Forward Error Correction + Distortion極限低減
- THD+N -120dB: Reference Studio Standard
- Pre-amp Function内蔵: HPA + Pre-amp Combined Versatility
- Balanced + Single-end両対応: 4-pin XLR + 1/4inch Headphone Output
- Reference Studio Standard: Pro Studio Mastering Reference
- US Syracuse Hand-built: Benchmark 43年Heritage
- Volume Knob 256-step Relay-controlled: Audiophile Precise Volume
- Color Touch Display: Modern UI
- Audiophile Pro Reference: Benchmark Iconic
- External Power Amp Drive対応: AHB2 Combination推奨
スペック比較表
| 項目 | Benchmark HPA4 | iFi iDSD Pro Signature | Schiit Yggdrasil | Holo May KTE |
|---|---|---|---|---|
| Topology | THX-AAA Solid State | Hybrid Tube + Solid State | Multibit R2R DAC | Discrete R2R DAC |
| Distortion | THD+N -120dB | Tube Optional | Multibit Reference | R2R Reference |
| Heritage | US 43年Pro Audio | UK iFi 14年 | US Schiit 16年 | China Heritage |
| 価格 | ¥390K | ¥330K | ¥350K | ¥850K |
関連用語との違い
iFi iDSD Pro Signatureとの違い: iDSD Pro Signature(Hybrid Tube + Solid State + Burr-Brown DAC + UK iFi Heritage + ¥330K)はHybrid Audiophile Premium、 HPA4(THX-AAA Pure Solid State + Pro Reference Studio Standard + US Syracuse + ¥390K Pre-amp内蔵)はPro Reference Solid State + Pre-amp Versatility。Hybrid Audiophile → iDSD Pro、 Pro Reference → HPA4。
よくある質問（FAQ）
Q1: THX-AAA Topology の効果は？ A: Feed-Forward Error Correction + Distortion極限低減(THD+N -120dB)+ Pro Studio Reference Standard + Mass Market Class AB対比 Audiophile Pro Reference Transparent Sound価値Proposition。
Q2: Pre-amp Function は本当に必要？ A: External Power Amp Drive重視User(Benchmark AHB2等Combination)+ Audiophile All-in-one Pro Studio Setup向け価値発揮、 Pure HPA重視User → 不要(HPA4 Premium / iDSD Pro等)。
Q3: ¥390K Pro Reference は本当に Audiophile？ A: Mass Market HPA(¥10-50K)対比 THX-AAA Pro Reference Studio Standard + 43年Pro Audio Heritage + Studio Mastering Reference地位 + Pre-amp Versatility + Audiophile Pro Reference認知度。
まとめ
- Benchmark HPA4 = 2018年Benchmark Reference HPA/Pre-amp
- THX-AAA Topology + THD+N -120dB
- Pre-amp Function内蔵 + Studio Reference Standard
- US Syracuse 43年Pro Audio Heritage
- Pro Reference + Pre-amp Versatility重視User向けNiche Premium