{"id":12731,"date":"2021-12-12T20:28:21","date_gmt":"2021-12-12T19:28:21","guid":{"rendered":"https:\/\/magnahifi.com\/product\/audio-gd-master-9p-dual-mono-balanced-integrated-power-amplifier-headamp\/"},"modified":"2024-04-23T19:27:28","modified_gmt":"2024-04-23T17:27:28","slug":"audio-gd-master-9p-dual-mono-balanced-integrated-power-amplifier-headamp","status":"publish","type":"product","link":"https:\/\/magnahifi.com\/it\/audio-gd-master-9p-dual-mono-balanced-integrated-power-amplifier-headamp\/","title":{"rendered":"Audio-GD \u2013 Master 9P &#8211; Dual mono balanced integrated power amplifier &#038; headamp"},"content":{"rendered":"<h2>HIGHLIGHTS<\/h2>\n<ul>\n<li>Integrated Amplifier = 2x 70 Watt RMS @ 8 ohms<\/li>\n<li>Headphone Amplifier = 2x 14W @ 40 ohms<\/li>\n<li>Neutral and Vacuum Valve sound like selectable<\/li>\n<li>ACSS Non Negative Feedback Amp<\/li>\n<li>&#8220;Linear Fidelity&#8221; Technology<\/li>\n<li>Soft Start Power Design<\/li>\n<\/ul>\n<h2>SPECIFICATIONS<\/h2>\n<table id=\"table1884\" border=\"1\" width=\"1028\">\n<tbody>\n<tr>\n<td colspan=\"2\" align=\"center\" width=\"985\"><span style=\"font-size: small;\">Improvement may result in changes in specifications and<br \/>\ndesign without notice.<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">S\/N Ratio<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">&gt;110DB (Full scale)<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">Gain<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">34 DB <span lang=\"en-us\">(high gain)<br \/>\n20DB (low gain)<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">\u00a0Output <span lang=\"en-us\">(Speaker)<\/span><\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">70W*2 @ 8ohm<br \/>\n100W*2 @ 4ohm<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">\u00a0Output <span lang=\"en-us\">(Headphone)<\/span><\/span><\/td>\n<td align=\"center\" width=\"668\"><span lang=\"en-us\"><span style=\"font-size: small;\">35<\/span><\/span><span style=\"font-size: small;\">W*2 @ <span lang=\"en-us\">15 <\/span>ohm<br \/>\n<\/span><span lang=\"en-us\"><span style=\"font-size: small;\">20<\/span><\/span><span style=\"font-size: small;\">W*2 @ <span lang=\"en-us\">25 <\/span>ohm<br \/>\n<span lang=\"en-us\">14<\/span>W*2 @<span lang=\"en-us\"> 40 <\/span>ohm<br \/>\n6<span lang=\"en-us\">W<\/span>*2 @ <span lang=\"en-us\">100 <\/span>ohm<br \/>\n2<span lang=\"en-us\">W*2 @ 300 ohm<br \/>\n1W *2 @ 600 ohm<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">Input sensitivety<br \/>\n<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">0.55V RMS @ XLR<br \/>\n2mA RMS @ ACSS<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">Input impedance<br \/>\n<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">47K ohm @ RCA<br \/>\n94K ohm @ XLR<br \/>\n&lt;10 ohm @ ACSS<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">THD+Noise<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">THD+N at 8 ohm 20W (&lt;0.055% at 1K, &lt;0.002% at 20KHz<span lang=\"en-us\">, 2VRms XLR input<\/span>)<\/span><br \/>\n<span style=\"font-size: small;\">THD+N at 8 ohm 60W (&lt;0.055% at 1K, &lt;0.005% at 20KHz<span lang=\"en-us\">, 2VRms XLR input<\/span>)<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">Frequency Breadth (ACSS input)<\/span><\/td>\n<td align=\"center\" width=\"668\"><span lang=\"en-us\"><span style=\"font-size: small;\">&lt;2.5DB at 200KHz (8 ohm 1W output, 2VRms XLR input)<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\"><br \/>\nChannels cross<br \/>\n?<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">&gt;-120DB<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">Channels imbalance<br \/>\n?<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">&lt; 0.05DB<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">Power Requirement<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">1 Version\u00a0 100-120V\u00a0 AC 50\/60 Hz<br \/>\n2 Version\u00a0 220-240V\u00a0 AC 50\/60 Hz<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">Power Consumption<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\"><span lang=\"en-us\">5<\/span>0W static @240V or 120V<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">Transformer Power<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">600W (<span lang=\"en-us\">2 <\/span>transformers)<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">Package Weight<\/span><\/td>\n<td align=\"center\" width=\"668\"><span lang=\"EN-US\">Approximately <\/span><span lang=\"en-us\"><span style=\"font-size: small;\">1<\/span><\/span><span style=\"font-size: small;\"><span lang=\"en-us\">8<\/span>KG<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\"><span lang=\"en-us\">Product<\/span> Weight<\/span><\/td>\n<td align=\"center\" width=\"668\"><span lang=\"EN-US\">Approximately <\/span><span lang=\"en-us\"><span style=\"font-size: small;\">16<\/span><\/span><span style=\"font-size: small;\">KG<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"343\"><span style=\"font-size: small;\"><br \/>\nDimensions<br \/>\n?<\/span><\/td>\n<td align=\"center\" width=\"673\"><span style=\"font-size: small;\">W430 X L430 X H93 (MM, Fully aluminium ) <\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" width=\"314\"><span style=\"font-size: small;\">Accessories<\/span><\/td>\n<td align=\"center\" width=\"668\"><span style=\"font-size: small;\">Power cord\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 X1<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 class=\"uppercase\">ACSS \u00a0Technology<\/h2>\n<p>Master-9P is a true balanced design applying the newest ACSS design which can improved the XLR connection to sound as good as the ACSS connection. It seems complex , but in fact they are the most simple design the world has ever had , their a lot components to process the power supply. The Master-9P power amp only has a single &#8221; voltage&#8221; gain stage to process signals, but works in ACSS mode so in fact it is a current gain stage instead of voltage gain stage, whereas normal OPA chips already include two or three voltage gain stages. The simplest and shortest signal journey brings out the most neutral and least colored sound.<\/p>\n<p>Master-9P applies ultra-low distortion single stage ACSS amplifier and soldered directly on the motherboard . The gain stages and pre-driver stages working on class A . The output transistors stages working on high idle current state . The diamond cross output stage design can avoid &#8220;switch distortion&#8221; as good as the class A amp .<\/p>\n<h2>NON FEEDBACK<\/h2>\n<p>The ACSS is a non-feedback technology made with fully discrete amplifiers. Most people know the global feedback design can offer better specs in test measurements, and non-feedback can&#8217;t do well in test measurements but can offer better sound for the human&#8217;s ears. Here is a conflict of the classic circuits. But the ACSS opens a new field, it can offer a least coloration sound which is more neutral with very low distortion and high linearity. So it can retain the dynamics, detail and neutral sound but not sound bright or harsh.<br \/>\nAll signal gain is in current, achieved by the unique, superb open-loop multiple output current mirror. Incomparably precise and ultra-low distortion in the gain signal is the result. The signal path is balanced throughout and all transistors work in class A mode.<br \/>\nThe ACSS parts use 4 groups of high-quality class A parallel connection PSU for dedicated DC supply. The class A parallel connection PSU has very high input impedance to avoid pulse from the PSU from affecting the gain stages, and low output impedance with very fast speed and high linear, so it is a very clean power supply.<\/p>\n<h2>POWER SUPPLY<\/h2>\n<p>Massive use of high power parts and robust power supply guarantee vigorous current output that drives most existing loudspeakers.<br \/>\nMaster-9P applies four channels of non-feedback output stages composed of 8 pieces of ON Semiconductor transistors, every piece has 15A\/230W performance. The capacitance of the whole machine reaches as high as 100,000uF. Two transformers are used with total power of 600W.<\/p>\n<h2 class=\"uppercase\">Impedance matching<\/h2>\n<p>There are a lot different DACs in world, they had different design and output impedance .<br \/>\nFor avoid the sound quality effect by different DAC&#8217;s output impedance, in the Master 9, it had design 4 groups expensive Single polarity class A FET cascode buffers in the input . All the input signals through these FET buffers, the output impedance had become very low, even the source had high or low output impedance.<br \/>\nThe FET buffers working on pure class A state, and it is so short signal journey , it can keep the sound quality without coloration ,dry and harsh .<\/p>\n<h2 class=\"uppercase\">Volume control<\/h2>\n<p>The volume control is also different from conventional technology. Conventional volume control technology is the volume control implement in the analog amp input stage through a volume pot to reduce the signal . The volume pots quality effect the sound quality direct , the low quality volume pot cause lost the detail and channels imbalance cause the soundstage distortion . Even the high performance volume pot still cause the detail lose. Whatever quality volume pots, must cause the S\/N worst .<br \/>\nBut in the Master 9P , we applied the I\/V conversion volume control , the volume control just a variable passive I\/V conversion place at the ACSS amp output , where the output is the current signal, not the voltage signal. The volume control is I\/V conversion, and the volume depends on the current (I) conversion to the voltage (V). (Like R-2R D\/A chips output passive I\/V conversion) It can keep the signal frequency band flat and not lost any detail. It can&#8217;t degrade on sound quality in every volume level . After the volume , there are four groups diamond non-feedback buffer output stages offer the very low output impedance .<br \/>\nThe volume control quality is much important in the real balance gear . It must guarantee the four channels signal control exact to achieve the performance of the real balance gear . If the cool and hot of the balance signal can&#8217;t guarantee exact, the balance output will has large distortion cause the sound quality and performance even much worst than a single end gear waste the balance gear design and the cost.<\/p>\n<p>In Master 9P is applied a four channels digital control relays based volume control. .Master 9P has total four channels through changing the tolerance 0.05% resistors to control the volume for avoid channels imbalanced ,achieve the best performance and sound quality of the gear.<\/p>\n<h2>CHASSIS &amp; SHIELDING<\/h2>\n<p>Master 9P has complete separation of left, right amplifier channels, power supply, and transformer.<br \/>\nMaster 9P uses heavyweight all-aluminum alloy chassis to prevent the eddy current of transformers from interfering on circuit board.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Audio-GD Master 9PN (Neutral edition), is an integrated amplifier with powerful 2x 70 Watt output @ 8 Ohm speaker output and 2x 14 Watt @ 40 Ohm to drive most headphones without any problem.<\/p>\n<p>The Master 9P has a dual mono, balanced design with gain stages and pre-driver stages in Class-A. Discrete analogue stages without opamps or coupling capacitors as\u00a0always the case with Audio-GD.\u00a0The output transistor stages have excellent linear characteristics. It sounds like a class-A amp should sound without the ill effect of the excessive heat. The Master 9P becomes hand warm.<\/p>\n<p>Power Supply is heavy and oversized with a \u00a0capacitance over 100,000 uF, with two circle core in total 600W power\u00a0Two gain modes with 100 steps exponent character volume control , high gain has 34DB, low gain has 20DB<\/p>\n<p>Inputs: RCA X2, XLR X2, ACSS X1<br \/>\nSpeaker output stereo pair<br \/>\nHeadphone amp output: 1x 4-PIN XLR \/ 2x 3-PIN XLR \/ 1x 6.3mm Jack<br \/>\nHeadphone output options have selectable neutral and vacuum valve sound option<\/p>\n","protected":false},"featured_media":12723,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_cat":[173,172,241],"product_tag":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Audio-GD \u2013 Master 9P - Dual mono balanced integrated power amplifier &amp; headamp &#8226; Magna Hifi<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/magnahifi.com\/it\/audio-gd-master-9p-dual-mono-balanced-integrated-power-amplifier-headamp\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Audio-GD \u2013 Master 9P - Dual mono balanced integrated power amplifier &amp; headamp &#8226; Magna Hifi\" \/>\n<meta property=\"og:description\" content=\"Audio-GD Master 9PN (Neutral edition), is an integrated amplifier with powerful 2x 70 Watt output @ 8 Ohm speaker output and 2x 14 Watt @ 40 Ohm to drive most headphones without any problem.  The Master 9P has a dual mono, balanced design with gain stages and pre-driver stages in Class-A. Discrete analogue stages without opamps or coupling capacitors as\u00a0always the case with Audio-GD.\u00a0The output transistor stages have excellent linear characteristics. It sounds like a class-A amp should sound without the ill effect of the excessive heat. The Master 9P becomes hand warm.  Power Supply is heavy and oversized with a \u00a0capacitance over 100,000 uF, with two circle core in total 600W power\u00a0Two gain modes with 100 steps exponent character volume control , high gain has 34DB, low gain has 20DB  Inputs: RCA X2, XLR X2, ACSS X1 Speaker output stereo pair Headphone amp output: 1x 4-PIN XLR \/ 2x 3-PIN XLR \/ 1x 6.3mm Jack Headphone output options have selectable neutral and vacuum valve sound option\" \/>\n<meta property=\"og:url\" content=\"https:\/\/magnahifi.com\/it\/audio-gd-master-9p-dual-mono-balanced-integrated-power-amplifier-headamp\/\" \/>\n<meta property=\"og:site_name\" content=\"Magna Hifi\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/MagnaHifi\/\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-23T17:27:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/magnahifi.com\/wp-content\/uploads\/2021\/12\/audio-gd-master-9p-dual-mono-integrated-headpphone-amplifier-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data1\" content=\"5 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/magnahifi.com\/it\/audio-gd-master-9p-dual-mono-balanced-integrated-power-amplifier-headamp\/\",\"url\":\"https:\/\/magnahifi.com\/it\/audio-gd-master-9p-dual-mono-balanced-integrated-power-amplifier-headamp\/\",\"name\":\"Audio-GD \u2013 Master 9P - Dual mono balanced integrated power amplifier & headamp &#8226; 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Magna Hifi","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/magnahifi.com\/it\/audio-gd-master-9p-dual-mono-balanced-integrated-power-amplifier-headamp\/","og_locale":"it_IT","og_type":"article","og_title":"Audio-GD \u2013 Master 9P - Dual mono balanced integrated power amplifier & headamp &#8226; Magna Hifi","og_description":"Audio-GD Master 9PN (Neutral edition), is an integrated amplifier with powerful 2x 70 Watt output @ 8 Ohm speaker output and 2x 14 Watt @ 40 Ohm to drive most headphones without any problem.  The Master 9P has a dual mono, balanced design with gain stages and pre-driver stages in Class-A. Discrete analogue stages without opamps or coupling capacitors as\u00a0always the case with Audio-GD.\u00a0The output transistor stages have excellent linear characteristics. It sounds like a class-A amp should sound without the ill effect of the excessive heat. The Master 9P becomes hand warm.  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