{"version":"1.0","provider_name":"The Audio People","provider_url":"https:\/\/theaudiopeople.com.vn\/vi","author_name":"admin","author_url":"https:\/\/theaudiopeople.com.vn\/vi\/author\/admin\/","title":"Cayin HA-300B Mk. II - The Audio People","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"ctaPZ9AbWZ\"><a href=\"https:\/\/theaudiopeople.com.vn\/vi\/product\/cayin-ha-300b-mk-ii\/\">Cayin HA-300B Mk. II<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/theaudiopeople.com.vn\/vi\/product\/cayin-ha-300b-mk-ii\/embed\/#?secret=ctaPZ9AbWZ\" width=\"600\" height=\"338\" title=\"&#8220;Cayin HA-300B Mk. II&#8221; &#8212; The Audio People\" data-secret=\"ctaPZ9AbWZ\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/theaudiopeople.com.vn\/wp-includes\/js\/wp-embed.min.js\n<\/script>","thumbnail_url":"https:\/\/theaudiopeople.com.vn\/wp-content\/uploads\/2025\/10\/ACP_CAYIN_ha300mk2_4.jpg","thumbnail_width":1080,"thumbnail_height":1080,"description":"Cayin Audio\u2019s HA-300 MKII\u00a0is upon us, to ensure the modern headphone enthusiast can continue to enjoy the magic from historic 300B tubes with any headphone. Important refinements over its predecessor include a MUSES72320 resistor ladder electronic volume control part. This preserves signal-to-noise ratio and channel balance down to the ALPS-controlled encoder&#8217;s lowest level \u2013 perfect for however much, or little, travel you need. A 4.4mm output ensures yet more headphones can be plugged in via Pentaconn\u2019s ubiquitous connector for transformer-balanced operation. With headphones having developed leaps and bounds since the turn of the decade, Cayin guarantee their latest and greatest flagship keeps up with the times. That was exactly as Headfonics discovered, such that any can\u00a0thrown at it performed in ways\u00a0not thought\u00a0possible.\u00a0[See Product Desc. For More] HA-300 MKII has been built again as a Class A single-ended triode amplifier to preserve the all-important even-order harmonics\u00a0audio enthusiasts crave from such topologies. But Cayin&#8217;s flagship remains a truly reference device. The direct-heated magic from Genelex PX300Bs \u2013 bearing the Gold Lion mark of quality \u2013 continues to provide Cayin with access to square law, load line and graceful soft-clipping triode functions at the drawing board to push down distortion without the crutch of negative feedback.\u00a0 HA-300 MKII&#8217;s\u00a0high tube operating voltage ensures excellent open-loop linearity\u00a0and additionally reduces the need for negative feedback. Clean power is supplied by a physically separated power supply built around a massive toroid. A choke input in tandem with a huge smoothing capacitor locks stable, quality, DC power in place without sag, post\u00a022DE4\u00a0tube rectification. Indeed, power supply regulation is thorough, extending beyond typical small signal regions to\u00a0encompass even the power stage and high-voltage sections of the amplifier. Huge EI-core output transformers with reinforcing shielding are wound in-house to Cayin\u2019s exact spec for frequency extension at the extremes, lowering impedances and providing immense inductance for the lowest bass reproduction, plus great top-end transparency owing to their shape. Custom-built AudioCapX MultiCap coupling capacitors upgraded for MKII&#8217;s signal path are also ideal for passing low frequencies and extending\u00a0bass down to 10Hz. Phase reproduction in the audible human hearing range remains stellar as a result, with taut dynamics and\u00a0impactful slam \u2013 not the wooly affairs of yesteryear&#8217;s transformer amps. That high bandwidth gets delivered into any working personal audio transducer, with HA-300 MKII&#8217;s output transformers allowing it to drive low-impedance, low-sensitivity planar-magnetic headphones balanced via 4.4mm and 4-pin XLRs pushing up to\u00a06 watts on the front. That potent Class A power can even be switched to speaker terminals on the rear to drive high-impedance, high-sensitivity passive speakers from the likes of Rogers, DeVORE Fidelity or Zu Audio. What&#8217;s crazier is this brute in ballet shoes produces next to no hiss into sensitive earphones via 4.4mm &#8230; a true feat, barely imaginable, till this point. There is therefore almost no scenario in which you can&#8217;t enjoy this\u00a0HA-300 MKII\u00a0behemoth. Or, employ a different Cayin specialist that you can browse here, and view all our other amplifiers here."}