{"product_id":"parasound-halo-a-31-3-channel-250w-power-amplifier-thx-ultra2-john-curl","title":"Parasound Halo A 31 3-Channel 250W Power Amplifier, THX Ultra2, John Curl","description":"\u003c!-- ============================================================\n     PARASOUND HALO A 31 — ProHiFi Shopify Product Listing\n     ============================================================\n\n     FIELD 1 — PRODUCT TITLE\n     Parasound Halo A 31 3-Channel 250W Power Amplifier, THX Ultra2, John Curl\n     (73 characters)\n\n     FIELD 2 — SEO PAGE TITLE\n     Parasound Halo A 31 3-Channel 250W Power Amplifier | THX Ultra2\n     (64 characters)\n\n     FIELD 3 — SEO META DESCRIPTION\n     Shop Parasound A 31 — 3-channel 250W THX Ultra2 power amplifier by John Curl, 60A peak, balanced XLR, Class A\/AB. Authorised Parasound Dealer. Best Price in India.\n     (163 characters — trimmed below)\n\n     TRIMMED META (158 characters):\n     Shop Parasound A 31 — 3-channel 250W THX Ultra2 power amp by John Curl, 60A peak, balanced XLR, direct-coupled. Authorised Parasound Dealer. Best Price in India.\n\n     FIELD 4 — URL HANDLE\n     parasound-halo-a31-3-channel-250w-power-amplifier-thx-ultra2\n     (60 characters)\n\n     PASTE DESCRIPTION HTML BELOW INTO SHOPIFY HTML EDITOR\n     ============================================================ --\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eParasound Halo A 31\u003c\/strong\u003e is a three-channel power amplifier designed by John Curl, delivering 250 watts per channel into 8 ohms and 400 watts into 4 ohms with all three channels driven simultaneously. It is THX Ultra2 certified and is designed to serve as the dedicated front-stage amplifier in a home cinema system, handling left, centre, and right channels from any AV receiver or processor with pre-outs.\u003c\/p\u003e\n\n\u003cp\u003eThe circuit uses high-bias Class A\/AB operation, with the first 7 watts per channel in pure Class A before transitioning to AB. A direct-coupled signal path contains no capacitors or inductors. Twenty-four beta-matched 15 ampere, 60 MHz bipolar output transistors per channel, a 1.5 kVA toroidal transformer with independent secondary windings per channel, and 98,400 microfarads of filter capacitance provide 60 amps of peak current on demand. ProHiFi is an authorised Parasound dealer in India.\u003c\/p\u003e\n\n\u003cp\u003eBalanced XLR and gold-plated RCA inputs are provided for each of the three channels, with adjustable gain of up to plus 6dB over THX Reference level for system matching flexibility. Heavy-duty 24k gold-plated 5-way speaker terminals, DC servo and relay protection, and auto turn-on by 12V trigger or audio sensing complete the feature set. The 4U chassis includes carry handles and a rack mounting adapter.\u003c\/p\u003e\n\n\u003cp\u003eSoundStage! Access awarded it a Reviewers' Choice, calling its sound clear and detailed with a touch of warmth that made it a joy to listen to. Secrets of Home Theater and High Fidelity called it a wonderful amplifier that stayed out of the way and let the music speak, impeccably built and beautiful in appearance. Stereophile described remarkable definition, clean luminous sound, and firm extended bass that never lacked for power.\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\u003e250W x 3 into 8 ohm; 400W x 3 into 4 ohm; all channels driven\u003c\/li\u003e\n\u003cli\u003eTHX Ultra2 certified; designed by John Curl\u003c\/li\u003e\n\u003cli\u003eHigh-bias Class A\/AB; first 7W per channel in pure Class A\u003c\/li\u003e\n\u003cli\u003eDirect-coupled; no capacitors or inductors 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\u003e24 beta-matched 15A\/60MHz bipolar output transistors per channel\u003c\/li\u003e\n\u003cli\u003e1.5 kVA toroidal transformer; 98,400 microfarad filter capacitance\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and gold-plated RCA inputs for all 3 channels\u003c\/li\u003e\n\u003cli\u003eAdjustable gain up to plus 6dB over THX Reference level\u003c\/li\u003e\n\u003cli\u003eHeavy-duty 24k gold-plated 5-way speaker terminals\u003c\/li\u003e\n\u003cli\u003eAuto turn-on by 12V trigger or audio signal; 4U chassis with rack adapter\u003c\/li\u003e\n\u003cli\u003e445 x 194 x 508mm; 29.5kg; Black or Silver\u003c\/li\u003e\n\u003cli\u003eSoundStage! Access Reviewers' Choice; Secrets of HT Recommended; Stereophile Reviewed\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 31\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003eThe A 31 is the right choice for home cinema listeners who want to give their front three speakers, the channels that carry the most critical content in any film or multichannel music mix, dedicated reference-grade amplification. The THX Ultra2 certification confirms the sustained power delivery required for large room reference playback, and the 60 amps of peak current ensures the front stage never sounds compressed or strained on even the most demanding material. Paired with a Parasound A 52+ for surround channels, or used alongside a JC 5 for bi-amped front mains with a dedicated centre channel, the A 31 builds naturally into a complete Parasound Halo multichannel system. SoundStage! and Secrets of Home Theater independently confirmed that the price does not reflect the performance level.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cspan style=\"color: #0F527F;\"\u003eIdeal for\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHome cinema systems dedicating amplification to the three front channels\u003c\/li\u003e\n\u003cli\u003eTHX Ultra2 certified installations requiring verified reference performance\u003c\/li\u003e\n\u003cli\u003eSystems pairing with a Parasound A 52+ for complete 5 or 7 channel separation\u003c\/li\u003e\n\u003cli\u003eAV receivers and processors with three-channel pre-outs\u003c\/li\u003e\n\u003cli\u003eDemanding speaker loads requiring 60A peak current per channel\u003c\/li\u003e\n\u003cli\u003eRack-mounted installations needing a 4U chassis with carry handles\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\u003eOutput (8 ohm, all channels driven)\u003c\/td\u003e\n\u003ctd\u003e250W x 3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput (4 ohm, all channels driven)\u003c\/td\u003e\n\u003ctd\u003e400W x 3\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; first 7W pure Class A per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Path\u003c\/td\u003e\n\u003ctd\u003eDirect-coupled; no capacitors or inductors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDriver Stage\u003c\/td\u003e\n\u003ctd\u003eComplementary MOSFET\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Stage\u003c\/td\u003e\n\u003ctd\u003eJFET\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Transistors\u003c\/td\u003e\n\u003ctd\u003e24 beta-matched 15A\/60MHz bipolar devices per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertification\u003c\/td\u003e\n\u003ctd\u003eTHX Ultra2\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\u003ePower Bandwidth\u003c\/td\u003e\n\u003ctd\u003e5Hz to 100kHz, plus 0 \/ minus 3dB at 1W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD at Full Power\u003c\/td\u003e\n\u003ctd\u003eLess than 0.2%\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\u003eSNR (A-weighted)\u003c\/td\u003e\n\u003ctd\u003e112dB\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 78dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrosstalk at 20kHz\u003c\/td\u003e\n\u003ctd\u003eGreater than 63dB\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\u003eMain Transformer\u003c\/td\u003e\n\u003ctd\u003e1.5 kVA encapsulated toroid; independent secondary windings per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Capacitance\u003c\/td\u003e\n\u003ctd\u003e98,400 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\u003e3 (one per channel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRCA Inputs\u003c\/td\u003e\n\u003ctd\u003e3 (gold-plated, one per channel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGain Adjustment\u003c\/td\u003e\n\u003ctd\u003eUp to plus 6dB over THX Reference level per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeaker Terminals\u003c\/td\u003e\n\u003ctd\u003e3 pairs; heavy-duty 24k gold-plated 5-way\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance (Unbalanced)\u003c\/td\u003e\n\u003ctd\u003e47k ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance (Balanced)\u003c\/td\u003e\n\u003ctd\u003e94k ohm\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 signal sensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eDC servo, relay protection circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront Panel Indicators\u003c\/td\u003e\n\u003ctd\u003eAC present, channel status (x3), high temperature\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\u003e445 x 194 x 508 mm (with feet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e29.5 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\u003e4U; carry handles; rack mount adapter included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Design\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAwards\u003c\/td\u003e\n\u003ctd\u003eSoundStage! Access Reviewers' Choice 2015; Secrets of Home Theater and High Fidelity Recommended 2015; Stereophile Reviewed 2012; Home Cinema Choice Reviewed 2014\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":45215991595031,"sku":null,"price":655000.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/6819\/6887\/files\/a31_front_black.webp?v=1781359181","url":"https:\/\/prohifi.in\/products\/parasound-halo-a-31-3-channel-250w-power-amplifier-thx-ultra2-john-curl","provider":"ProHiFi India","version":"1.0","type":"link"}