Power amp, integrated, and preamp reviews for loudspeakers - tube, solid-state, Class A, AB, and D, driven into real speaker loads and never sponsored.https://theaudiostuff.com/reviews/speaker-amps/enTue, 12 Aug 2025 00:00:00 GMThttps://theaudiostuff.com/apple-touch-icon.pnghttps://theaudiostuff.comhttps://theaudiostuff.com/reviews/denafrips-hades-12th/https://theaudiostuff.com/reviews/denafrips-hades-12th/A pure Class A, fully balanced, true discrete preamp with a 60-step relay-based resistor ladder volume control - perfect channel balance, 0.00045% THD, 122dB SNR.Tue, 12 Aug 2025 00:00:00 GMT<p><img src="https://i.ytimg.com/vi/RUfZXSPa4ec/maxresdefault.jpg" alt="Denafrips Hades 12th review on The Audio Stuff" width="1280" height="720" /></p><p>A pure Class A, fully balanced, true discrete preamp with a 60-step relay-based resistor ladder volume control - perfect channel balance, 0.00045% THD, 122dB SNR.</p><p><strong>Verdict:</strong> Highly Recommended - 9.0/10. <strong>Price:</strong> $1,369.</p><p><strong>What's good</strong></p><ul><li>Precision-machined thick aluminum chassis, no flex</li><li>60-step relay-based stepped attenuator (R2R volume)</li><li>Perfect channel balance at any volume</li><li>Pure Class A, fully discrete, true balanced signal path</li><li>80VA O-core transformer with discrete linear PSU</li><li>0.00045% THD, 122dB SNR - whisper-quiet background</li><li>Solid aluminum remote that matches the build</li><li>Adjustable display brightness for any room</li></ul><p><strong>Worth knowing</strong></p><ul><li>Three feet instead of four - could be more stable</li><li>Unity gain only - some amps may need more volume</li><li>9kg unit isn&#39;t trivial to move around</li><li>Simple I/O - just 2 XLR + 1 RCA in, XLR + RCA out</li><li>Display can&#39;t be fully turned off</li><li>Relay clicks may bother those who want silent volume changes</li></ul><p><a href="https://theaudiostuff.com/reviews/denafrips-hades-12th/">Read the full Denafrips Hades 12th review on The Audio Stuff</a></p>Jakub Charkiewiczspeaker-ampsDenafripspreamplifierr2rdenafripsbalancedclass-astepped-attenuatorcontact@theaudiostuff.com (Jakub Charkiewicz)https://theaudiostuff.com/reviews/tonewinner-ad-1pa-plus/https://theaudiostuff.com/reviews/tonewinner-ad-1pa-plus/A 43kg switchable Class A/AB power amplifier paired with a fully balanced preamp - 100W Class A or 500W Class AB into 4Ω with serious bass control and golden-hued mids.Mon, 14 Jul 2025 00:00:00 GMT<p><img src="https://i.ytimg.com/vi/Yi38zeahnzU/maxresdefault.jpg" alt="Tonewinner AD-1PA+ review on The Audio Stuff" width="1280" height="720" /></p><p>A 43kg switchable Class A/AB power amplifier paired with a fully balanced preamp - 100W Class A or 500W Class AB into 4Ω with serious bass control and golden-hued mids.</p><p><strong>Verdict:</strong> Highly Recommended - 9.0/10. <strong>Price:</strong> $3,999.</p><p><strong>What's good</strong></p><ul><li>Massive 43kg overbuilt chassis with side heatsinks</li><li>Switchable Class A / Class AB topology</li><li>Fully balanced differential input and BTL output stages</li><li>8 pairs of Hi-Fi transistors per channel - 60A capacity</li><li>1200W toroidal transformer + 180,000μF capacitance</li><li>Stable down to 2Ω - drives demanding speakers</li><li>Matching AD-1PRE+ preamp with built-in phono stage</li><li>Tactile, milled-metal volume knob with notched rotation</li></ul><p><strong>Worth knowing</strong></p><ul><li>Significant heat output in Class A mode</li><li>Class AB sounds drier and more clinical vs Class A</li><li>Notes start/stop more abruptly - lacks tube fluidity</li><li>43kg is hard to move - placement is permanent</li><li>Up to 1200W power draw from the wall</li><li>No automatic Class A/AB switching</li></ul><p><a href="https://theaudiostuff.com/reviews/tonewinner-ad-1pa-plus/">Read the full Tonewinner AD-1PA+ review on The Audio Stuff</a></p>Jakub Charkiewiczspeaker-ampsTonewinneramplifierclass-aclass-abtonewinnerbalancedcontact@theaudiostuff.com (Jakub Charkiewicz)https://theaudiostuff.com/reviews/tonewinner-ad-2pro-plus/https://theaudiostuff.com/reviews/tonewinner-ad-2pro-plus/A 40 kg, 240W integrated amp with switchable Class A and Class A/B modes, neutral tonality, and the kind of dynamic headroom that pairs well with virtually any speaker.Mon, 08 Apr 2024 00:00:00 GMT<p><img src="https://i.ytimg.com/vi/iPvz_b7tC20/maxresdefault.jpg" alt="Tonewinner AD-2PRO+ review on The Audio Stuff" width="1280" height="720" /></p><p>A 40 kg, 240W integrated amp with switchable Class A and Class A/B modes, neutral tonality, and the kind of dynamic headroom that pairs well with virtually any speaker.</p><p><strong>Verdict:</strong> Highly Recommended - 8.8/10. <strong>Price:</strong> $2,699.</p><p><strong>What's good</strong></p><ul><li>Massive 40 kg / 80 lb solid build with large heatsinks</li><li>Switchable Class A and Class A/B operation</li><li>240W into 8Ω, handles speakers below 4Ω with ease</li><li>Neutral tonality with rich, full-bodied midrange</li><li>Exceptional instrument separation</li><li>Built-in DAC with USB DSD512 / PCM 32-bit/768kHz support</li><li>MM/MC phono, sub-outs, two pairs of speaker outs</li><li>Easy-to-read front LED screen</li></ul><p><strong>Worth knowing</strong></p><ul><li>Center image can be a little fuzzy</li><li>Soundstage favors width over pinpoint imaging</li><li>Generates a lot of heat over time</li><li>Heavy and large - placement requires planning</li><li>THD below 0.05% isn&#39;t extremely low for the price</li></ul><p><a href="https://theaudiostuff.com/reviews/tonewinner-ad-2pro-plus/">Read the full Tonewinner AD-2PRO+ review on The Audio Stuff</a></p>Jakub Charkiewiczspeaker-ampsTonewinnerintegrated-amplifierclass-aclass-abtonewinnercontact@theaudiostuff.com (Jakub Charkiewicz)