{"id":18295,"date":"2023-10-24T12:42:40","date_gmt":"2023-10-24T12:42:40","guid":{"rendered":"https:\/\/masteringmansion.com\/pro-audio\/?post_type=product&#038;p=18295"},"modified":"2026-08-25T13:11:05","modified_gmt":"2026-08-25T13:11:05","slug":"7603-microphone-preamp-eq","status":"publish","type":"product","link":"https:\/\/masteringmansion.com\/pro-audio\/categorias\/preamplificadores-y-canales\/7603-microphone-preamp-eq\/","title":{"rendered":"7603 MICROPHONE PREAMP &#038; EQ"},"content":{"rendered":"<div class=\"fe-block fe-block-yui_3_17_2_1_1672276707884_162464\">\n<div id=\"block-yui_3_17_2_1_1672276707884_162464\" class=\"sqs-block html-block sqs-block-html\" data-block-type=\"2\">\n<div class=\"sqs-block-content\">\n<div class=\"sqs-html-content\">\n<p>The 7603 is Chameleon\u2019s flagship pre-amplifier, representing a leap forward in analog design, performance, versatility and value. It is the true embodiment of our philosophy<\/p>\n<p>&nbsp;<\/p>\n<div class=\"fe-block fe-block-yui_3_17_2_1_1672276707884_162464\">\n<div id=\"block-yui_3_17_2_1_1672276707884_162464\" class=\"sqs-block html-block sqs-block-html\" data-block-type=\"2\">\n<div class=\"sqs-block-content\">\n<div class=\"sqs-html-content\">\n<ul data-rte-list=\"default\">\n<li>\n<p class=\"preFade fadeIn\">Discrete EQ Op-amps<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Proprietary Wound Input and Output Transformers<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">SMT Construction<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Vetted Film Resistors<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Custom Internal Power Supply<\/p>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"fe-block fe-block-a635e3b09bed580e509d\">\n<div id=\"block-a635e3b09bed580e509d\" class=\"sqs-block html-block sqs-block-html\" data-block-type=\"2\">\n<div class=\"sqs-block-content\">\n<div class=\"sqs-html-content\">\n<h2 class=\"preFade fadeIn\">7603 FEATURES<\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"fe-block fe-block-0d13087491b0a974d88b\">\n<div id=\"block-0d13087491b0a974d88b\" class=\"sqs-block horizontalrule-block sqs-block-horizontalrule\" data-block-type=\"47\">\n<div class=\"sqs-block-content\">\n<hr \/>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"fe-block fe-block-yui_3_17_2_1_1672276707884_2616536\">\n<div id=\"block-yui_3_17_2_1_1672276707884_2616536\" class=\"sqs-block html-block sqs-block-html\" data-block-type=\"2\">\n<div class=\"sqs-block-content\">\n<div class=\"sqs-html-content\">\n<ul data-rte-list=\"default\">\n<li>\n<p class=\"preFade fadeIn\">Chameleon wound microphone and Line Input transformers and Chameleon output transformer, all with mu-metal housings<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">High resolution, low noise discrete audio circuitry<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Hi-Z Direct Instrument Input (TRS)<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Discrete Class A Electronic Topology<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Three band, inductor based EQ<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">48V phantom power for mic input<\/p>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"fe-block fe-block-5433b1f55eb994fb194f\">\n<div id=\"block-5433b1f55eb994fb194f\" class=\"sqs-block html-block sqs-block-html\" data-block-type=\"2\">\n<div class=\"sqs-block-content\">\n<div class=\"sqs-html-content\">\n<ul data-rte-list=\"default\">\n<li>\n<p class=\"preFade fadeIn\">Selectable 300\u03a9 or 1200\u03a9 Mic Input Impedance<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Custom VU meter (input\/output) with calibrated ballistics<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Relay based selection of Line \/ Mic &amp; DI Inputs<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Overload input and output indicators<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Reverse Phase Switch<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\">Universal, on-board power supply<\/p>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"fe-block fe-block-2840c2b51a8e6f9f5fe2\">\n<div id=\"block-2840c2b51a8e6f9f5fe2\" class=\"sqs-block html-block sqs-block-html\" data-block-type=\"2\">\n<div class=\"sqs-block-content\">\n<div class=\"sqs-html-content\">\n<h2 class=\"preFade fadeIn\">DESCRIPTION<\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"fe-block fe-block-cee72b00171072532d69\">\n<div id=\"block-cee72b00171072532d69\" class=\"sqs-block horizontalrule-block sqs-block-horizontalrule\" data-block-type=\"47\">\n<div class=\"sqs-block-content\">\n<hr \/>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"fe-block fe-block-yui_3_17_2_1_1672276707884_2601665\">\n<div id=\"block-yui_3_17_2_1_1672276707884_2601665\" class=\"sqs-block html-block sqs-block-html\" data-block-type=\"2\">\n<div class=\"sqs-block-content\">\n<div class=\"sqs-html-content\">\n<p class=\"preFade fadeIn\">Its fundamental design architecture retraces the path of revered, classic pre-amps of the past as well as our popular <a href=\"http:\/\/chameleonlabs.com\/products\/7602-mkii\">7602<\/a>. Our engineers at Chameleon have worked tirelessly in developing new, pivotal components that allow us to take the next step forward in performance.<\/p>\n<p class=\"preFade fadeIn\">These enhancements start with all-new proprietary microphone and line-level input transformers that feature custom-made nickel laminations and bobbin assemblies\u2014all designed in-house. By developing new engineering processes focused on the material science associated with lamination manufacturing, Chameleon was able to develop a lamination \u201crecipe\u201d that delivers optimized audio performance, providing the 7603 with high bandwidth and incredibly low distortion.<\/p>\n<p class=\"preFade fadeIn\">Design of our new transformers was based around the need to capture and preserve the delicate audio input signals\u2019 truest form, and so they are enclosed in high permeability MuMetal enclosures, designed to protect sensitive audio signals from radio frequencies, spurious and parasitic noises.<\/p>\n<p class=\"preFade fadeIn\">Once your audio exits the input transformer, our circuit boards are carefully crafted to ensure the highest possible signal integrity. As a starting point, we developed a new discrete audio input gain stage based on our vision for a solid topology that provides extremely low noise, high dynamics and extreme bandwidth. All of the 7603\u2019s operational amplifiers used throughout the device are based on this topology.<\/p>\n<p class=\"preFade fadeIn\">The 7603 features EQ stages with four different available adjustments\u2014Variable High Pass, Low Frequency Shelving, Mid Frequency and High Frequency Shelving. Our engineers made a conscious decision to stay with the same, desirable, inductor-based topology that made our <a href=\"http:\/\/chameleonlabs.com\/products\/7602-mkii\">7602<\/a> so popular, however we implemented our new discrete Op Amp to drive signal through a new set of custom Chameleon designed and manufactured inductors, providing the musicality we all love to use.<\/p>\n<p class=\"preFade fadeIn\">The output stage of the 7603 is unique with respect to its design and performance. It can be described as a variable-gain circuit that simultaneously adjusts both the input and output levels in order to generate a lower noise floor and extraordinary audio performance.<\/p>\n<p class=\"preFade fadeIn\">The 7603 pre-amplifier provides a desirable set of user selectable functions designed to make the unit flexible and an integral part of the artistic process, incorporating a full portfolio of traditional features as well as some not commonly seen on other pre-amps.<\/p>\n<p class=\"preFade fadeIn\">Microphone input impedance can be selected between 300 and 1200 ohms, providing a method by which a microphone can be more ideally matched to the input stage and making it easier to get the best from lower output microphones such as ribbon-based designs.<\/p>\n<p class=\"preFade fadeIn\">We added a low impedance Direct Input on the front panel for plugging in instruments such as guitars that can be run through the line input stage, and added a precision VU meter with custom ballistics for visual monitoring of either the input or output levels.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"fe-block fe-block-8f892b995f81edf48fe8\">\n<div id=\"block-8f892b995f81edf48fe8\" class=\"sqs-block html-block sqs-block-html\" data-block-type=\"2\">\n<div class=\"sqs-block-content\">\n<div class=\"sqs-html-content\">\n<h2 class=\"preFade fadeIn\">SPECIFICATIONS<\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"fe-block fe-block-f1279f1bee9819299889\">\n<div id=\"block-f1279f1bee9819299889\" class=\"sqs-block horizontalrule-block sqs-block-horizontalrule\" data-block-type=\"47\">\n<div class=\"sqs-block-content\">\n<hr \/>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"fe-block fe-block-82d00a857f348e13f3e7\">\n<div id=\"block-82d00a857f348e13f3e7\" class=\"sqs-block html-block sqs-block-html\" data-block-type=\"2\">\n<div class=\"sqs-block-content\">\n<div class=\"sqs-html-content\">\n<h3 class=\"preFade fadeIn\"><strong>User Controlled Functions<\/strong><\/h3>\n<ul data-rte-list=\"default\">\n<li>\n<p class=\"preFade fadeIn\"><strong>On Switch:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Turn Pre Amp On &#8211; VU Meter Light<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>300\u03a9 \/ 1200\u03a9 Switch:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Switch between 300\u03a9 and 1200\u03a9 input impedance for the mic input<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>48V Power Supply Switch:<\/strong><\/p>\n<p class=\"preFade fadeIn\">On\/Off<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>DI Switch:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Direct Input with 100K\u03a9 input sensitivity<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>EQ Switch:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Engages audio high pass filter and equalization circuits<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Polarity Switch:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Reverses the polarity of the audio signal<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Mic\/Line Sensitivity Switch:<\/strong><\/p>\n<p class=\"preFade fadeIn\">+20dB to +70dB of mic boost and -30dB to +20dB of line level adjustment.<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>High Pass Filter:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Provides a 15dB\/octave high pass filter at 40Hz, 80Hz, 160Hz and 320Hz<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Low Frequency Equalization:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Provides +\/-15dB of Boost or Cut at 35Hz, 60Hz, 110Hz or 220Hz<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Mid Frequency Equalization:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Provides +\/-15dB of Boost or Cut at 360Hz, 700Hz, 1.6kHz, 3.2kHz, 4.8kHz or 7.2kHz<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>High Frequency Equalization:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Provides +\/-15dB of Boost or Cut at 3.4kHz, 4.9kHz, 7kHz, 12kHz or 16kHz<\/p>\n<\/li>\n<\/ul>\n<h3 class=\"preFade fadeIn\"><strong>Inputs<\/strong><\/h3>\n<ul data-rte-list=\"default\">\n<li>\n<p class=\"preFade fadeIn\"><strong>Microphone (XLR):<\/strong><\/p>\n<p class=\"preFade fadeIn\">Transformer balanced input, RF isolated<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Line (XLR):<\/strong><\/p>\n<p class=\"preFade fadeIn\">Transformer balanced input, RF isolated<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Direct In (1\/4\u201d TRS):<\/strong><\/p>\n<p class=\"preFade fadeIn\">High impedance instrument input<\/p>\n<\/li>\n<\/ul>\n<h3 class=\"preFade fadeIn\"><strong>Input Impedance<\/strong><\/h3>\n<ul data-rte-list=\"default\">\n<li>\n<p class=\"preFade fadeIn\"><strong>Microphone:<\/strong><\/p>\n<p class=\"preFade fadeIn\">300\u03a9 or 1200\u03a9<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Line:<\/strong><\/p>\n<p class=\"preFade fadeIn\">10k\u03a9 line bridging from 600\u03a9 or lower source impedance<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Direct Input:<\/strong><\/p>\n<p class=\"preFade fadeIn\">100k\u03a9<\/p>\n<\/li>\n<\/ul>\n<h3 class=\"preFade fadeIn\"><strong>Sensitivity<\/strong><\/h3>\n<ul data-rte-list=\"default\">\n<li>\n<p class=\"preFade fadeIn\"><strong>Microphone:<\/strong><\/p>\n<p class=\"preFade fadeIn\">From -70dBm to -20dBm in 5 dB steps for 0dBm output<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Line:<\/strong><\/p>\n<p class=\"preFade fadeIn\">From -30 dBm to +20 dBm in 5 dB steps for 0 dBm output<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Noise Specification:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Better than -125dBm EIN between -80 and -40 dBm referenced to 600\u03a9 input impedance, SNR 116dB at maximum output<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Output Type:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Transformer balanced and floating to drive 600 \u03a9 load<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Maximum Output:<\/strong><\/p>\n<p class=\"preFade fadeIn\">+28dBu into 600\u03a9 load impedance<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Frequency Response:<\/strong><\/p>\n<p class=\"preFade fadeIn\">10Hz &#8211; 20kHz -0.5dB 10Hz &#8211; 50kHz -1dB<\/p>\n<\/li>\n<\/ul>\n<h3 class=\"preFade fadeIn\"><strong>Indicators<\/strong><\/h3>\n<ul data-rte-list=\"default\">\n<li>\n<p class=\"preFade fadeIn\"><strong>VU Meter Light:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Power ON<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Red Input Gain:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Input Overload<\/p>\n<\/li>\n<li>\n<p class=\"preFade fadeIn\"><strong>Red Output Gain:<\/strong><\/p>\n<p class=\"preFade fadeIn\">Output Overload<\/p>\n<\/li>\n<\/ul>\n<h3 class=\"preFade fadeIn\"><strong>Power Supply<\/strong><\/h3>\n<ul data-rte-list=\"default\">\n<li>\n<p class=\"preFade fadeIn\"><strong>100V &#8211; 240V (50\/60Hz):<\/strong><\/p>\n<p class=\"preFade fadeIn\">Switch mode power supply, fully shielded 3 amp peak output capability, quiescent consumption 0.5 Watts<\/p>\n<\/li>\n<\/ul>\n<h3 class=\"preFade fadeIn\"><strong>Mechanical<\/strong><\/h3>\n<ul data-rte-list=\"default\">\n<li>\n<p class=\"preFade fadeIn\">1RU Steel enclosure<br \/>\nAluminum front panel<br \/>\nLaser etched graphics<br \/>\nMilled aluminum knobs<\/p>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Line \/ Mic \/ DI Pre-Amplifier<\/p>\n","protected":false},"featured_media":18296,"template":"","meta":[],"pwb-brand":[854],"product_brand":[],"product_cat":[1029],"product_tag":[855,857,856],"class_list":["post-18295","product","type-product","status-publish","has-post-thumbnail","pwb-brand-chameleon_labs","product_cat-preamplificadores-y-canales","product_tag-chamaleon-labs","product_tag-equalizer","product_tag-mic-preamp","first","onbackorder","sale","taxable","shipping-taxable","purchasable","product-type-simple"],"brands":[{"id":854,"name":"CHAMELEON LABS","slug":"chameleon_labs"}],"_links":{"self":[{"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product\/18295","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/media\/18296"}],"wp:attachment":[{"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/media?parent=18295"}],"wp:term":[{"taxonomy":"pwb-brand","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/pwb-brand?post=18295"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product_brand?post=18295"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product_cat?post=18295"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product_tag?post=18295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}