{"product_id":"parasound-halo-a-21-300w-stereo-power-amplifier-john-curl-bridgeable","title":"Parasound Halo A 21+ 2-Channel 300W Stereo Power Amplifier, John Curl, Bridgeable","description":"\u003c!-- ============================================================\n     PARASOUND HALO A 21+ — ProHiFi Shopify Product Listing\n     ============================================================\n\n     FIELD 1 — PRODUCT TITLE\n     Parasound Halo A 21+ 300W Stereo Power Amplifier, John Curl, Bridgeable\n     (71 characters)\n\n     FIELD 2 — SEO PAGE TITLE\n     Parasound Halo A 21+ 300W Stereo Power Amplifier | John Curl\n     (61 characters)\n\n     FIELD 3 — SEO META DESCRIPTION\n     Shop Parasound A 21+ — 300W stereo power amp by John Curl, 60A peak, 1000W bridged mono, balanced XLR, Class A\/AB. Authorised Parasound Dealer. Best Price in India.\n     (165 characters — trimmed below)\n\n     TRIMMED META (157 characters):\n     Shop Parasound A 21+ — 300W Class A\/AB stereo amp by John Curl, 60A peak, 1000W bridged mono, balanced XLR. Authorised Parasound Dealer. Best Price in India.\n\n     FIELD 4 — URL HANDLE\n     parasound-halo-a21-plus-300w-stereo-power-amplifier-john-curl\n     (61 characters)\n\n     PASTE DESCRIPTION HTML BELOW INTO SHOPIFY HTML EDITOR\n     ============================================================ --\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eParasound Halo A 21+\u003c\/strong\u003e is a stereo power amplifier designed by John Curl, delivering 300 watts per channel into 8 ohms and 500 watts into 4 ohms with both channels driven, and 1,000 watts bridged into mono. It is the upgraded successor to the original A 21, which had remained one of Parasound's best-selling amplifiers for over fifteen years.\u003c\/p\u003e\n\n\u003cp\u003eCompared to the original A 21, the A 21+ brings a 20% increase in power output, larger filter capacitance (108,000 microfarads vs 88,000), a larger 1.3 kVA transformer, halved THD at full power (0.1% vs 0.2%), improved channel separation at 20kHz (70dB vs 63dB), and upgraded heavy-duty speaker binding posts inherited from the JC 5. The internal audio connections are gold on gold throughout. ProHiFi is an authorised Parasound dealer in India.\u003c\/p\u003e\n\n\u003cp\u003eThe circuit is high-bias Class A\/AB with a direct-coupled signal path containing no capacitors in the signal path. Peak current capacity is 60 amps per channel, and the damping factor exceeds 1,100 at 20Hz. Each channel has its own individual gain control and loop output on the rear panel, providing flexibility for bi-amping and multi-amplifier configurations. The A 21+ is also bridgeable to mono, configuring left and right channels as a single 1,000 watt output.\u003c\/p\u003e\n\n\u003cp\u003eStereophile's Kalman Rubinson concluded it is the very model of a modern power amplifier, recommending it to anyone in the market for a stereo power amp, especially those who believe they must spend more. Future Audiophile compared its 0.1% THD at full power to pure spring water versus the bioswale output of poorly rated amplifiers. Positive Feedback called it an exceptional value achieved through decades of experience and John Curl's guidance.\u003c\/p\u003e\n\n\u003c!-- KEY FEATURES --\u003e\n\u003ch2\u003e\u003cspan style=\"color: #0F527F;\"\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e300W x 2 into 8 ohm; 500W x 2 into 4 ohm; both channels driven\u003c\/li\u003e\n\u003cli\u003e1000W bridged mono into 8 ohm\u003c\/li\u003e\n\u003cli\u003eHigh-bias Class A\/AB; designed by John Curl\u003c\/li\u003e\n\u003cli\u003eDirect-coupled; no capacitors in signal path\u003c\/li\u003e\n\u003cli\u003e60A peak current per channel; slew rate greater than 130 V\/microsecond\u003c\/li\u003e\n\u003cli\u003e1.3 kVA toroidal transformer; 108,000 microfarad filter capacitance\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and RCA inputs; per-channel gain control and loop output\u003c\/li\u003e\n\u003cli\u003eHeavy-duty 5-way speaker binding posts from JC 5; gold on gold connections\u003c\/li\u003e\n\u003cli\u003eSNR greater than 115dB A-weighted; damping factor greater than 1100\u003c\/li\u003e\n\u003cli\u003e12V trigger and audio-sensing auto turn-on; rack mountable\u003c\/li\u003e\n\u003cli\u003e448 x 197 x 508mm; 32.2kg; Black or Silver\u003c\/li\u003e\n\u003cli\u003eStereophile Recommended Component; Positive Feedback Writers' Choice; Future Audiophile Recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- WARRANTY --\u003e\n\u003ch2\u003e\u003cspan style=\"color: #0F527F;\"\u003eWarranty:\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e3-year manufacturer's warranty\u003c\/p\u003e\n\u003cdiv class=\"ph-warranty-box\"\u003e\u003c\/div\u003e\n\n\u003c!-- WHY CONSIDER --\u003e\n\u003ch2\u003e\u003cspan style=\"color: #0F527F;\"\u003eWhy Consider the Parasound Halo A 21+\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003eThe A 21+ is the right choice for listeners who want a high-power stereo amplifier with John Curl's circuit design at a more accessible price than the JC 5. With 300 watts per channel, 60 amps of peak current, and stability into difficult loads, it drives virtually any loudspeaker with authority. Stereophile's measurement bench confirmed it exceeds its rated power significantly, clipping at 400 watts into 8 ohms. The bridged mono capability at 1,000 watts gives a clear upgrade path, and the per-channel gain control and loop outputs make it equally suited to bi-amping or professional installation. Paired with the JC 2 BP or any quality line stage, it forms a reference-level stereo combination at a price that Stereophile described as making it pointless for most listeners to spend more.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cspan style=\"color: #0F527F;\"\u003eIdeal for\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-performance two-channel systems wanting 300W per channel at a mid-range price\u003c\/li\u003e\n\u003cli\u003eDemanding speaker loads that benefit from 60A peak current and 500W into 4 ohms\u003c\/li\u003e\n\u003cli\u003eSystems pairing with the Parasound JC 2 BP preamplifier or Halo P 6\u003c\/li\u003e\n\u003cli\u003eBi-amping configurations using the per-channel gain controls and loop outputs\u003c\/li\u003e\n\u003cli\u003eListeners wanting bridgeable mono capability for a future 1000W upgrade path\u003c\/li\u003e\n\u003cli\u003eHome cinema front channels needing high-power stereo amplification\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- SPECIFICATIONS --\u003e\n\u003ch2\u003e\u003cspan style=\"color: #0F527F;\"\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cstyle\u003e\n  .ph-spec-wrap { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }\n  .ph-spec-wrap table { width: 100%; min-width: 360px; border-collapse: collapse; font-size: 0.95em; }\n  .ph-spec-wrap table thead th { text-align: left; padding: 9px 12px; border-bottom: 2px solid #222; font-family: Georgia, serif; }\n  .ph-spec-wrap table td { padding: 8px 12px; border-bottom: 1px solid #eee; vertical-align: top; }\n  .ph-spec-wrap table td:first-child { width: 42%; }\n  .ph-spec-wrap .ph-sec-hd td { font-weight: bold; font-size: 0.78em; text-transform: uppercase; letter-spacing: 0.05em; border-bottom: 1px solid #ddd; padding: 7px 12px; }\n  @media (max-width: 480px) {\n    .ph-spec-wrap table thead { display: none; }\n    .ph-spec-wrap table tr { display: block; margin-bottom: 12px; border: 1px solid #ddd; border-radius: 4px; overflow: hidden; }\n    .ph-spec-wrap .ph-sec-hd { display: block; }\n    .ph-spec-wrap .ph-sec-hd td { display: block; width: 100%; box-sizing: border-box; background: #f5f5f5; }\n    .ph-spec-wrap table td { display: block; width: 100% !important; box-sizing: border-box; border-bottom: 1px solid #eee; }\n    .ph-spec-wrap table td:first-child { font-weight: bold; background: #fafafa; }\n    .ph-spec-wrap table td:last-child { border-bottom: none; }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"ph-spec-wrap\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\n\u003ctr class=\"ph-sec-hd\"\u003e\u003ctd colspan=\"2\"\u003ePower Output\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStereo (8 ohm, both channels driven)\u003c\/td\u003e\n\u003ctd\u003e300W x 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStereo (4 ohm, both channels driven)\u003c\/td\u003e\n\u003ctd\u003e500W x 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBridged Mono (8 ohm)\u003c\/td\u003e\n\u003ctd\u003e1000W x 1 (4 ohm bridged not recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Current per Channel\u003c\/td\u003e\n\u003ctd\u003e60 amps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlew Rate\u003c\/td\u003e\n\u003ctd\u003eGreater than 130 V\/microsecond\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDynamic Headroom\u003c\/td\u003e\n\u003ctd\u003eGreater than 1.5dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr class=\"ph-sec-hd\"\u003e\u003ctd colspan=\"2\"\u003eCircuit Design\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesigner\u003c\/td\u003e\n\u003ctd\u003eJohn Curl\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTopology\u003c\/td\u003e\n\u003ctd\u003eHigh-bias Class A\/AB; direct-coupled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Path\u003c\/td\u003e\n\u003ctd\u003eNo capacitors in signal path\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr class=\"ph-sec-hd\"\u003e\u003ctd colspan=\"2\"\u003ePerformance\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e5Hz to 100kHz, plus 0 \/ minus 3dB; 20Hz to 20kHz, plus 0 \/ minus 0.25dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD at Full Power\u003c\/td\u003e\n\u003ctd\u003eLess than 0.1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD at Typical Listening\u003c\/td\u003e\n\u003ctd\u003eLess than 0.03%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntermodulation Distortion\u003c\/td\u003e\n\u003ctd\u003eLess than 0.04%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTIM\u003c\/td\u003e\n\u003ctd\u003eUnmeasurable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSNR (A-weighted)\u003c\/td\u003e\n\u003ctd\u003eGreater than 115dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDamping Factor\u003c\/td\u003e\n\u003ctd\u003eGreater than 1100 at 20Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrosstalk at 1kHz\u003c\/td\u003e\n\u003ctd\u003eGreater than 80dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrosstalk at 20kHz\u003c\/td\u003e\n\u003ctd\u003eGreater than 70dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGain\u003c\/td\u003e\n\u003ctd\u003e29dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr class=\"ph-sec-hd\"\u003e\u003ctd colspan=\"2\"\u003ePower Supply\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransformer\u003c\/td\u003e\n\u003ctd\u003e1.3 kVA toroidal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Capacitance\u003c\/td\u003e\n\u003ctd\u003e108,000 microfarad\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr class=\"ph-sec-hd\"\u003e\u003ctd colspan=\"2\"\u003eInputs and Outputs\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBalanced XLR Inputs\u003c\/td\u003e\n\u003ctd\u003e1 pair; with loop output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRCA Inputs\u003c\/td\u003e\n\u003ctd\u003e1 pair; with loop output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePer-Channel Gain Control\u003c\/td\u003e\n\u003ctd\u003eYes (rear panel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeaker Binding Posts\u003c\/td\u003e\n\u003ctd\u003eA\/B heavy-duty 5-way posts (from JC 5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance (Unbalanced)\u003c\/td\u003e\n\u003ctd\u003e33k ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance (Balanced)\u003c\/td\u003e\n\u003ctd\u003e66k ohm (33k ohm per leg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr class=\"ph-sec-hd\"\u003e\u003ctd colspan=\"2\"\u003eControl and Protection\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAuto Turn-on\u003c\/td\u003e\n\u003ctd\u003e12V trigger or audio sensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eDC servo, relay protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr class=\"ph-sec-hd\"\u003e\u003ctd colspan=\"2\"\u003ePower\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandby\u003c\/td\u003e\n\u003ctd\u003e1W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIdle\u003c\/td\u003e\n\u003ctd\u003e160W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical Listening\u003c\/td\u003e\n\u003ctd\u003e300W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum\u003c\/td\u003e\n\u003ctd\u003e1400W\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr class=\"ph-sec-hd\"\u003e\u003ctd colspan=\"2\"\u003eGeneral\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (W x H x D)\u003c\/td\u003e\n\u003ctd\u003e448 x 197 x 508 mm (with feet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e32.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Finishes\u003c\/td\u003e\n\u003ctd\u003eBlack \/ Silver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis\u003c\/td\u003e\n\u003ctd\u003eRack mountable (ears included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Manufacture\u003c\/td\u003e\n\u003ctd\u003eTaiwan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAwards\u003c\/td\u003e\n\u003ctd\u003eStereophile Recommended Component 2020; Positive Feedback Writers' Choice 2020; Future Audiophile Recommended; AVTech Media Best Buy 2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- END ProHiFi Product Description --\u003e","brand":"Parasound","offers":[{"title":"Default Title","offer_id":45215991234583,"sku":null,"price":847000.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/6819\/6887\/files\/a21__front_black.webp?v=1781359015","url":"https:\/\/prohifi.in\/products\/parasound-halo-a-21-300w-stereo-power-amplifier-john-curl-bridgeable","provider":"ProHiFi India","version":"1.0","type":"link"}