{"product_id":"crown-set-straight-line-two-preamp-power-line-three-amplifier-fm-two-tuner-fully-serviced","title":"Crown Set * Straight Line Two Preamp * Power Line Three Amplifier * FM Two Tuner * Fully Serviced *","description":"\u003ch1 class=\"title\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0673\/9204\/5301\/files\/ServicePreamps.png?v=1775445887\" alt=\"\"\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0673\/9204\/5301\/files\/ServicePowerAmp.png?v=1775445787\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch1 class=\"title\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0673\/9204\/5301\/files\/A_million_ac724e73-c218-4c09-b403-3f03854fce4a.png?v=1775407815\" alt=\"\"\u003e\u003c\/h1\u003e\n\u003ch1 class=\"title\"\u003eCrown Straight Line Two\u003c\/h1\u003e\n\u003cp\u003eStereo Pre Amplifier (1983)\u003c\/p\u003e\n\u003cdiv class=\"model_main_image\"\u003e\u003ca href=\"https:\/\/www.hifiengine.com\/images\/model\/crown_straight_line_two_stereo_preamplifier.jpg\" data-lightbox=\"lightbox_group\" data-title=\"crown straight line two stereo preamplifier\"\u003e\n\u003cdiv class=\"model_main_image_inner\"\u003e\u003cimg src=\"https:\/\/www.hifiengine.com\/images\/model\/crown_straight_line_two.jpg\" alt=\"Crown Straight Line Two\" loading=\"lazy\" width=\"300\" height=\"90\"\u003e\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/div\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cp\u003eFrequency response: 10Hz to 50kHz\u003c\/p\u003e\n\u003cp\u003eTotal harmonic distortion: 0.009%\u003c\/p\u003e\n\u003cp\u003eGain: 30dB (MM), 20dB (line)\u003c\/p\u003e\n\u003cp\u003eInput sensitivity: 250mV (line)\u003c\/p\u003e\n\u003cp\u003eOutput: 250mV (line), 2.5V (Pre out)\u003c\/p\u003e\n\u003cp\u003eWeight: 5kg\u003c\/p\u003e\n\u003cp\u003eYear: 1983\u003c\/p\u003e\n\u003cp\u003e--------------------------------------------------------------------------------------\u003c\/p\u003e\n\u003cdiv class=\"widecol col-xs-48\"\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"col-xs-42 col-xs-push-3\"\u003e\n\u003ch1 class=\"content__headline\" itemprop=\"headline\"\u003eCrown Power Line Three Power Amplifier Review\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"maincol col-xs-26 col-xs-push-3\"\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"col-xs-48\"\u003e\n\u003cfigure class=\"article-image\" itemprop=\"image\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/ImageObject\"\u003e\u003cimg itemprop=\"contentUrl\" data-src=\"images\/488\/crown-power-line-three.jpg\" alt=\"Crown Power Line Three\" class=\"teaser__image img-responsive image-replace\" src=\"https:\/\/www.hifi-classic.net\/images\/488\/crown-power-line-three.jpg\" width=\"490\"\u003e\n\u003cfigcaption class=\"article-image__description\" itemprop=\"caption\"\u003eCrown Power Line Three\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003caside class=\"ad--google_adsense\" itemscope=\"\" itemtype=\"https:\/\/schema.org\/WPAdBlock\"\u003e\n\u003caside class=\"ad--google_adsense\" itemscope=\"\" itemtype=\"https:\/\/schema.org\/WPAdBlock\"\u003e\u003cins class=\"adsbygoogle\" data-ad-client=\"ca-pub-5026228084405652\" data-ad-slot=\"1251013726\" data-adsbygoogle-status=\"done\" data-ad-status=\"unfilled\"\u003e\n\u003cdiv id=\"aswift_1_host\"\u003eThe Crown Power Line 3 basic power amplifier is rated to deliver 90 watts per channel into 8-ohm loads from 20 to 20,000 Hz with no more than 0.05 per cent distortion, or 140 watts into 4-ohm loads with no more than 0.1 per cent distortion. Like the other Power Line amplifiers, it features Crown’s proprietary Multi-Mode circuit, which continuously varies the operating mode of the amplifier between class A and class B according to the instantaneous signal output it is called upon to deliver. The purpose of the Multi-Mode system is to provide the lowest possible distortion at all signal levels together with maximum overall circuit efficiency.\u003c\/div\u003e\n\u003c\/ins\u003e\u003c\/aside\u003e\n\u003cp\u003eUnlike the variable-mode (or variable-class) circuits used in some other amplifiers, which affect only the output stage, the Multi-Mode circuits control the operating conditions of the three highest-level amplification stages (pre-driver, driver, and output). At low output-power levels (up to 20 milliwatts) all three stages operate in class-A mode, which is inherently completely free of crossover distortion as well as being the most nearly linear amplification mode. Crown points out that with ordinary music program material the amplifier actually operates in this mode most of the time. As the instantaneous power of the signal waveform rises above 20 milliwatts, the output transistors change to class-B operation, the highest-efficiency mode of a linear audio amplifier. Since the drivers and pre-drivers continue to operate in class A, Crown calls this the “Class A plus B” mode.\u003c\/p\u003e\n\u003cp\u003eFinally, at the highest power levels, the driver and pre-driver stages change to class-AB operation so that they can drive the output transistors (operating in class B) to their full power output (a class-B amplifier requires actual driving power, instead of only a voltage or current input, in order to develop its full output). Crown refers to this as the “Class AB plus B” mode. These three basic operating conditions of the Multi-Mode circuit vary more or less continuously throughout the signal waveform and are separately determined for the positive and negative portions of the waveform cycle.\u003c\/p\u003e\n\u003caside class=\"ad--google_adsense\" itemscope=\"\" itemtype=\"https:\/\/schema.org\/WPAdBlock\"\u003e\u003cins class=\"adsbygoogle\" data-ad-client=\"ca-pub-5026228084405652\" data-ad-slot=\"1251013726\" data-adsbygoogle-status=\"done\" data-ad-status=\"unfilled\"\u003e\n\u003cdiv id=\"aswift_2_host\"\u003eThe Power Line 3 is protected against overdrive or improper load conditions by several internal systems. A fast-acting limiter instantaneously holds the output power to a maximum safe value in the event of an output short or undesirably low load impedance. According to Crown, this circuit produces a muffled snapping sound when it operates, but it will not be activated if the load impedance is 4 ohms or higher. Since the Power Line 3 is completely direct-coupled from its input jacks to the speaker outputs, the speakers are protected with a low-frequency interrupt circuit that places the amplifier in a stand-by mode if it senses more than 10 millivolts of direct current at the output. Each channel has its own thermal protection system, which also places the amplifier in stand-by mode until it has cooled to a safe temperature. Finally, an a.c.-line fuse protects the entire amplifier against a catastrophic internal failure. The very comprehensive manual for the Power Line 3 provides recommendations for fusing the speaker lines externally.\u003c\/div\u003e\n\u003c\/ins\u003e\u003c\/aside\u003e\n\u003cp\u003eThe Crown Power Line 3’s front panel has a silver-colored satin finish with matching handles and knobs. The chassis and large heat-sink fins that extend to the rear are finished in fiat black. The front panel contains a pushbutton power switch, two in-put-level knobs with thirty detented settings, and a headphone jack. Two groups of colored LED’s between the knobs, designated a “Frequency Analyzing Display,” show the approximate frequency content of the program (for each channel, yellow, green, and red lights, respectively, come on for low-, medium-, and high-frequency signals). Above the display are two red lights marked IOC (input\/output comparator). The Power Line 3 has circuits that constantly compare the input and output waveforms, and any difference between them causes the corresponding channel's IOC light to flash. This is a very sensitive type of clipping indicator whose warning signal precedes any audible distortion.\u003c\/p\u003e\n\u003caside class=\"ad--google_adsense\" itemscope=\"\" itemtype=\"https:\/\/schema.org\/WPAdBlock\"\u003e\u003cins class=\"adsbygoogle\" data-ad-client=\"ca-pub-5026228084405652\" data-ad-slot=\"1251013726\" data-adsbygoogle-status=\"done\" data-ad-status=\"unfilled\"\u003e\n\u003cdiv id=\"aswift_3_host\"\u003eOn the rear of the Crown Power Line 3 are two pairs of five-way binding posts for the speaker outputs and a slide switch that connects the amplifier for bridged mono operation. In the mono mode, the power ratings and recommended load impedances are doubled (to 180 and 280 watts and 16 and 8 ohms), the signal is connected to the left input, and the speaker is connected to the two “hot” output terminals. The two phono-input jacks and the line fuse complete the rear-apron features.\u003c\/div\u003e\n\u003c\/ins\u003e\u003c\/aside\u003e\n\u003cp\u003eThe Crown Power Line 3 is 19 inches wide, 10-l\/8 inches deep, and 5-1\/4 inches high (the handles extend 2-3\/8 inches in front of the panel). It weighs about 25 pounds.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePrice:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e$949.\u003c\/p\u003e\n\u003cp\u003e--------------------------------------------------------------------------------------\u003c\/p\u003e\n\u003ch1 class=\"title\"\u003eCrown FM-2\u003c\/h1\u003e\n\u003cp\u003eFM Stereo Tuner (1985)\u003c\/p\u003e\n\u003cbr\u003e\u003cimg src=\"https:\/\/www.hifiengine.com\/images\/model\/crown_fm-2.jpg\" alt=\"Crown FM-2\" loading=\"lazy\" width=\"300\" height=\"125\"\u003e\u003c\/aside\u003e\n\u003c\/div\u003e","brand":"Crown","offers":[{"title":"Default Title","offer_id":48273742692597,"sku":null,"price":1500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/9204\/5301\/files\/comingsoon_59c35545-ea09-4dd3-b4ad-b4f24813b657.jpg?v=1781644968","url":"https:\/\/www.theturntablestore.com\/products\/crown-set-straight-line-two-preamp-power-line-three-amplifier-fm-two-tuner-fully-serviced","provider":"The Turntable Store","version":"1.0","type":"link"}