https://acousticresearchspeakers.net Sat, 04 Apr 2026 11:20:48 +0000 en-CA hourly 1 https://wordpress.org/?v=4.1.1 https://acousticresearchspeakers.net/2025/03/pair-of-acoustic-research-hi-res-series-ar1-floor-speakers-with-sunfire-woofer/ https://acousticresearchspeakers.net/2025/03/pair-of-acoustic-research-hi-res-series-ar1-floor-speakers-with-sunfire-woofer/#comments Mon, 24 Mar 2025 20:42:49 +0000 https://acousticresearchspeakers.net/2025/03/pair-of-acoustic-research-hi-res-series-ar1-floor-speakers-with-sunfire-woofer/ read more »]]>














He AR-1 is a three-way loudspeaker with a 15 woofer driven by a 500W, Sunfire-designed amplifier. Its tower-style enclosure is constructed from ¾ particleboard with picture-frame internal bracing. The tweeter is a 1, plasma-transferred, diamond-coated titanium dome. Surrounding the tweeter is an “energy-control contoured baffle, ” an integral waveguide for the tweeter made of foam of varying density, which controls the unit’s dispersion. This foam ring was used, said Mike Park, to produce a smoother off-axis response pattern by eliminating the edge-cancellation effects of the speaker’s narrow front baffle. Above and below the tweeter are a pair of 5.25 midrange drivers in a D’Appolito configuration. Each of these has a monocoque concave cone-with no dust cap-made from a very stiff magnesium-aluminum alloy. A 1 copper voice-coil is wound on an aluminum former, this said to double the sound-propagation velocity through the cone material and to lower the second and third harmonic distortion compared to a paper midrange cone. Each midrange driver is housed in a specially formulated, compressed-pulp sub-enclosure to provide isolation from the woofer. The 15 is mounted near the floor, on the cabinet’s side-the speaker is supplied as asymmetrical pairs, with left- and right-hand versions. Like the other drivers, the woofer is magnetically shielded. It is driven by an internal, high-efficiency amplifier designed by Sunfire Corporation and licensed to AR that uses a tracking down-converter (TDC). This amplifier features continuously variable power-supply voltages slightly higher than and in sync with the audio signal. Sunfire claims that the design allows its TDC amplifier to approach 85% power-conversion efficiency compared to the 20-30% of conventional designs. This amplifier can thus be a small, lightweight, cool-running, low-cost unit. Its built-in limiter IPC (intelligent parameter control) circuit provides an excursion limiter, a dynamic compressor, a thermal rollback limiter, active low-frequency equalization, infrasonic filtering, and automatic, signal-sensing amplifier turn on/off. The woofer is solidly, ruggedly constructed. It employs a 4-lb magnet, a vented pole-piece to improve voice-coil cooling, a half-roll foam surround, a and a two-layer, long-throw, copper voice-coil, 4 in diameter and wound on an aluminum former to provide high heat dissipation. Its rib-reinforced cone is made from a formulated paper material chemically treated with a clear polymer “Hydra-Plas” resonance-damping compound to reduce distortion and cone breakup. To further increase cone stiffness, the dustcap is inverted. The latest AR-1 includes equalization circuitry to allow the bass-level control to act as a narrow-Q parametric equalizer around 30Hz.

]]> https://acousticresearchspeakers.net/2025/03/pair-of-acoustic-research-hi-res-series-ar1-floor-speakers-with-sunfire-woofer/feed/ 0 https://acousticresearchspeakers.net/2024/05/acoustic-research-ar-s300-vintage-powered-subwoofer-sunfire-technology/ https://acousticresearchspeakers.net/2024/05/acoustic-research-ar-s300-vintage-powered-subwoofer-sunfire-technology/#comments Sat, 25 May 2024 09:57:50 +0000 https://acousticresearchspeakers.net/2024/05/acoustic-research-ar-s300-vintage-powered-subwoofer-sunfire-technology/












Beautiful conditions and sounds great.

]]> https://acousticresearchspeakers.net/2024/05/acoustic-research-ar-s300-vintage-powered-subwoofer-sunfire-technology/feed/ 0 https://acousticresearchspeakers.net/2020/02/acoustic-research-hi-res-ar1-sunfire-powered-2/ https://acousticresearchspeakers.net/2020/02/acoustic-research-hi-res-ar1-sunfire-powered-2/#comments Mon, 17 Feb 2020 13:33:10 +0000 http://acousticresearchspeakers.net/2020/02/acoustic-research-hi-res-ar1-sunfire-powered-2/ read more »]]>












Acoustic research Hi-Res Series AR-1 Sunfire Powered. Condition: 8.5 out of 10. Description: Three-way, floor-standing loudspeaker with 500W Sunfire powered woofer. Drive-units: one 1 (25mm) titanium-dome tweeter. Two 5.25 (135mm) aluminum-alloy cone mid-range drivers. One 15 (375mm) side-firing, acoustic-suspension woofer powered by an internal 500W RMS amplifier. Crossover frequencies: 100Hz active low-pass, 24dB/octave; passive high-pass at 120Hz, 12dB/octave; 2.5kHz high-pass, 12dB/octave. Frequency response: 20Hz-20kHz, ±3dB. Nominal impedance: 8 ohms. Woofer amplifier distortion: 0.1% THD at rated output. Woofer amplifier S/N ratio: 90dB ref. Dimensions: 43.7″ (1093mm) H by 10.6″ (265mm) W by 22.13 (553.1mm) D. Weight: 84 lbs (37.8kg) each. The item “Acoustic research Hi-Res AR1 Sunfire Powered” is in sale since Friday, February 7, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Speakers”. The seller is “dkrm9″ and is located in Englishtown, New Jersey. This item can’t be shipped, the buyer must pick up the item.

• Brand: Acoustic Research
• Country/Region of Manufacture: United States

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They are 100LB each. Come and hear it. You will be blown Away!! There is NO speaker today to replace it, period. The item “2 Speakers wth 15 500W Subwoofers Acoustic Research AR Sunfire Powered P315 HO” is in sale since Sunday, January 12, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Speakers”. The seller is “wheelbymail” and is located in Portland, Oregon. This item can’t be shipped, the buyer must pick up the item.

• Modified Item: No
• Country/Region of Manufacture: United States
• MPN: AR P315HO
• Brand: Acoustic Research

]]> https://acousticresearchspeakers.net/2020/02/2-speakers-wth-15-500w-subwoofers-acoustic-research-ar-sunfire-powered-p315-ho/feed/ 0 https://acousticresearchspeakers.net/2019/11/acoustic-research-hi-res-ar1-sunfire-powered/ https://acousticresearchspeakers.net/2019/11/acoustic-research-hi-res-ar1-sunfire-powered/#comments Thu, 28 Nov 2019 12:06:41 +0000 http://acousticresearchspeakers.net/2019/11/acoustic-research-hi-res-ar1-sunfire-powered/ read more »]]>












Acoustic research Hi-Res Series AR-1 Sunfire Powered. Condition: 8.5 out of 10. Description: Three-way, floor-standing loudspeaker with 500W Sunfire powered woofer. Drive-units: one 1 (25mm) titanium-dome tweeter. Two 5.25 (135mm) aluminum-alloy cone mid-range drivers. One 15 (375mm) side-firing, acoustic-suspension woofer powered by an internal 500W RMS amplifier. Crossover frequencies: 100Hz active low-pass, 24dB/octave; passive high-pass at 120Hz, 12dB/octave; 2.5kHz high-pass, 12dB/octave. Frequency response: 20Hz-20kHz, ±3dB. Nominal impedance: 8 ohms. Woofer amplifier distortion: 0.1% THD at rated output. Woofer amplifier S/N ratio: 90dB ref. Dimensions: 43.7″ (1093mm) H by 10.6″ (265mm) W by 22.13 (553.1mm) D. Weight: 84 lbs (37.8kg) each. The item “Acoustic research Hi-Res AR1 Sunfire Powered” is in sale since Sunday, November 24, 2019. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Speakers”. The seller is “dkrm9″ and is located in Englishtown, New Jersey. This item can’t be shipped, the buyer must pick up the item.

• Brand: Acoustic Research
• Country/Region of Manufacture: United States

]]> https://acousticresearchspeakers.net/2019/11/acoustic-research-hi-res-ar1-sunfire-powered/feed/ 0 https://acousticresearchspeakers.net/2018/04/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-5/ https://acousticresearchspeakers.net/2018/04/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-5/#comments Tue, 03 Apr 2018 23:28:21 +0000 http://acousticresearchspeakers.net/2018/04/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-5/ read more »]]>













Please read the listing carefully before asking any questions and note that I will not respond to offers. I’ve owned several pairs of the legendary AR-9s and these do indeed stack up well against them. Please read the following carefully, as I will only answer questions about this particular pair of speakers, and only questions not already addressed in the listing. The cabinets are free of scratches and have only a few very minor dings. All drivers are completely free of any damage and work without any issues. Both amps also function perfectly without any issues at all. The foam woofer surrounds is still very stiff and firm with no signs of aging or deterioration. The mid surrounds are rubber and will never wear out. The tweeters are protected from dust and damage by a fine gauze and are mint. The foam baffle and waveguide ring around the mid and tweeter units is still good, though not mint, as seen in the photos. Nothing that will in any way effect performance. The one issue is some cat damage to the cloth on the front grills, one worse than the other. Such minor damage is difficult to photograph, but please examine the photos closely if this is an issue. There is no damage to either side grill covering the woofers. Further info on the speakers. 96 dB sensitivity, so they require very little power. Great for low powered tube amps. Sunfire internal amplifier in each speaker designed by Bob Carver. Rated 500 watts at 0.1% THD. 85% efficient, with built in excursion limiter, dynamic compressor, thermal rollback limiter, active low-frequency equalization, infrasonic filtering, and auto signal sensing amplifier turn-off. 15 polymer treated paper woofer with 4 lb magnet structure. Two-layer, long-throw 4 voice-coil with aluminum former and vented pole-piece for heat dissipation. Dual 5 1/4 monocoque aluminum/magnesium alloy mid drivers in D’Appolito configuration, housed in separate enclosure. 3/4 particle board construction with picture-frame internal bracing. One 1 titanium-dome tweeter. Two 5.25 aluminum-alloy cone midrange drivers. One 15 side-firing, acoustic-suspension woofer powered by an internal 500W RMS amplifier. 100Hz active low-pass, 24dB/octave. Passive high-pass at 120Hz, 12dB/octave. 2.5kHz high-pass, 12dB/octave. Frequency response: 20Hz-20kHz, ±3dB. Nominal impedance: 8 ohms. Woofer amplifier distortion: 0.1% THD at rated output. Woofer amplifier S/N ratio: 90dB ref. Weight: 84 lbs each. The item “Acoustic Research P315 HO Speakers with Sunfire 500 watt amps (pair)” is in sale since Thursday, March 29, 2018. This item is in the category “Consumer Electronics\TV, Video & Home Audio\Home Speakers & Subwoofers”. The seller is “stevemichael_59″ and is located in Los Angeles, California. This item can’t be shipped, the buyer must pick up the item.

• Brand: Acoustic Research

]]> https://acousticresearchspeakers.net/2018/04/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-5/feed/ 0 https://acousticresearchspeakers.net/2017/12/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-4/ https://acousticresearchspeakers.net/2017/12/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-4/#comments Sat, 16 Dec 2017 09:37:06 +0000 http://acousticresearchspeakers.net/2017/12/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-4/ read more »]]>













I’ve owned several pairs of the legendary AR-9s and these do indeed stack up well against them. Please read the following carefully, as I will only answer questions about this particular pair of speakers, and only questions not already addressed in the listing. The cabinets are free of scratches and have only a few very minor dings. All drivers are completely free of any damage and work without any issues. Both amps also function perfectly without any issues at all. The foam woofer surrounds is still very stiff and firm with no signs of aging or deterioration. The mid surrounds are rubber and will never wear out. The tweeters are protected from dust and damage by a fine gauze and are mint. The foam baffle and waveguide ring around the mid and tweeter units is still good, though not mint, as seen in the photos. Nothing that will in any way effect performance. The one issue is some cat damage to the cloth on the front grills, one worse than the other. Such minor damage is difficult to photograph, but please examine the photos closely if this is an issue. There is no damage to either side grill covering the woofers. Further info on the speakers. 96 dB sensitivity, so they require very little power. Great for low powered tube amps. Sunfire internal amplifier in each speaker designed by Bob Carver. Rated 500 watts at 0.1% THD. 85% efficient, with built in excursion limiter, dynamic compressor, thermal rollback limiter, active low-frequency equalization, infrasonic filtering, and auto signal sensing amplifier turn-off. 15 polymer treated paper woofer with 4 lb magnet structure. Two-layer, long-throw 4 voice-coil with aluminum former and vented pole-piece for heat dissipation. Dual 5 1/4 monocoque aluminum/magnesium alloy mid drivers in D’Appolito configuration, housed in separate enclosure. 3/4 particle board construction with picture-frame internal bracing. One 1 titanium-dome tweeter. Two 5.25 aluminum-alloy cone midrange drivers. One 15 side-firing, acoustic-suspension woofer powered by an internal 500W RMS amplifier. 100Hz active low-pass, 24dB/octave. Passive high-pass at 120Hz, 12dB/octave. 2.5kHz high-pass, 12dB/octave. Frequency response: 20Hz-20kHz, ±3dB. Nominal impedance: 8 ohms. Woofer amplifier distortion: 0.1% THD at rated output. Woofer amplifier S/N ratio: 90dB ref. Weight: 84 lbs each. The item “Acoustic Research P315 HO Speakers with Sunfire 500 watt amps (pair)” is in sale since Thursday, December 14, 2017. This item is in the category “Consumer Electronics\TV, Video & Home Audio\Home Speakers & Subwoofers”. The seller is “stevemichael_59″ and is located in Los Angeles, California. This item can’t be shipped, the buyer must pick up the item.

• Brand: Acoustic Research

]]> https://acousticresearchspeakers.net/2017/12/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-4/feed/ 0 https://acousticresearchspeakers.net/2017/11/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-3/ https://acousticresearchspeakers.net/2017/11/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-3/#comments Thu, 16 Nov 2017 19:40:12 +0000 http://acousticresearchspeakers.net/2017/11/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-3/ read more »]]>













I’ve owned several pairs of the legendary AR-9s and these do indeed stack up well against them. Please read the following carefully, as I will only answer questions about this particular pair of speakers, and only questions not already addressed in the listing. The cabinets are free of scratches and have only a few very minor dings. All drivers are completely free of any damage and work without any issues. Both amps also function perfectly without any issues at all. The foam woofer surrounds is still very stiff and firm with no signs of aging or deterioration. The mid surrounds are rubber and will never wear out. The tweeters are protected from dust and damage by a fine gauze and are mint. The foam baffle and waveguide ring around the mid and tweeter units is still good, though not mint, as seen in the photos. Nothing that will in any way effect performance. The one issue is some cat damage to the cloth on the front grills, one worse than the other. Such minor damage is difficult to photograph, but please examine the photos closely if this is an issue. There is no damage to either side grill covering the woofers. Further info on the speakers. 96 dB sensitivity, so they require very little power. Great for low powered tube amps. Sunfire internal amplifier in each speaker designed by Bob Carver. Rated 500 watts at 0.1% THD. 85% efficient, with built in excursion limiter, dynamic compressor, thermal rollback limiter, active low-frequency equalization, infrasonic filtering, and auto signal sensing amplifier turn-off. 15 polymer treated paper woofer with 4 lb magnet structure. Two-layer, long-throw 4 voice-coil with aluminum former and vented pole-piece for heat dissipation. Dual 5 1/4 monocoque aluminum/magnesium alloy mid drivers in D’Appolito configuration, housed in separate enclosure. 3/4 particle board construction with picture-frame internal bracing. One 1 titanium-dome tweeter. Two 5.25 aluminum-alloy cone midrange drivers. One 15 side-firing, acoustic-suspension woofer powered by an internal 500W RMS amplifier. 100Hz active low-pass, 24dB/octave. Passive high-pass at 120Hz, 12dB/octave. 2.5kHz high-pass, 12dB/octave. Frequency response: 20Hz-20kHz, ±3dB. Nominal impedance: 8 ohms. Woofer amplifier distortion: 0.1% THD at rated output. Woofer amplifier S/N ratio: 90dB ref. Weight: 84 lbs each. The item “Acoustic Research P315 HO Speakers with Sunfire 500 watt amps (pair)” is in sale since Monday, November 13, 2017. This item is in the category “Consumer Electronics\TV, Video & Home Audio\Home Speakers & Subwoofers”. The seller is “stevemichael_59″ and is located in Los Angeles, California. This item can’t be shipped, the buyer must pick up the item.

• Brand: Acoustic Research

]]> https://acousticresearchspeakers.net/2017/11/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-3/feed/ 0 https://acousticresearchspeakers.net/2017/11/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-2/ https://acousticresearchspeakers.net/2017/11/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-2/#comments Fri, 03 Nov 2017 17:54:26 +0000 http://acousticresearchspeakers.net/2017/11/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-2/ read more »]]>













I’ve owned several pairs of the legendary AR-9s and these do indeed stack up well against them. Please read the following carefully, as I will only answer questions about this particular pair of speakers, and only questions not already addressed in the listing. The cabinets are free of scratches and have only a few very minor dings. All drivers are completely free of any damage and work without any issues. Both amps also function perfectly without any issues at all. The foam woofer surrounds is still very stiff and firm with no signs of aging or deterioration. The mid surrounds are rubber and will never wear out. The tweeters are protected from dust and damage by a fine gauze and are mint. The foam baffle and waveguide ring around the mid and tweeter units is still good, though not mint, as seen in the photos. Nothing that will in any way effect performance. The one issue is some cat damage to the cloth on the front grills, one worse than the other. Such minor damage is difficult to photograph, but please examine the photos closely if this is an issue. There is no damage to either side grill covering the woofers. The speakers will be sealed in stretch wrap and well-packed in double walled boxes. They will be entirely surrounded by solid sheets of Styrofoam. Further info on the speakers. 96 dB sensitivity, so they require very little power. Great for low powered tube amps. Sunfire internal amplifier in each speaker designed by Bob Carver. Rated 500 watts at 0.1% THD. 85% efficient, with built in excursion limiter, dynamic compressor, thermal rollback limiter, active low-frequency equalization, infrasonic filtering, and auto signal sensing amplifier turn-off. 15 polymer treated paper woofer with 4 lb magnet structure. Two-layer, long-throw 4 voice-coil with aluminum former and vented pole-piece for heat dissipation. Dual 5 1/4 monocoque aluminum/magnesium alloy mid drivers in D’Appolito configuration, housed in separate enclosure. 3/4 particle board construction with picture-frame internal bracing. One 1 titanium-dome tweeter. Two 5.25 aluminum-alloy cone midrange drivers. One 15 side-firing, acoustic-suspension woofer powered by an internal 500W RMS amplifier. 100Hz active low-pass, 24dB/octave. Passive high-pass at 120Hz, 12dB/octave. 2.5kHz high-pass, 12dB/octave. Frequency response: 20Hz-20kHz, ±3dB. Nominal impedance: 8 ohms. Woofer amplifier distortion: 0.1% THD at rated output. Woofer amplifier S/N ratio: 90dB ref. Weight: 84 lbs each. The item “Acoustic Research P315 HO Speakers with Sunfire 500 watt amps (pair)” is in sale since Wednesday, November 01, 2017. This item is in the category “Consumer Electronics\TV, Video & Home Audio\Home Speakers & Subwoofers”. The seller is “stevemichael_59″ and is located in Los Angeles, California. This item can be shipped to United States.

• Brand: Acoustic Research

]]> https://acousticresearchspeakers.net/2017/11/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair-2/feed/ 0 https://acousticresearchspeakers.net/2017/10/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair/ https://acousticresearchspeakers.net/2017/10/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair/#comments Tue, 03 Oct 2017 02:53:00 +0000 http://acousticresearchspeakers.net/2017/10/acoustic-research-p315-ho-speakers-with-sunfire-500-watt-amps-pair/ read more »]]>













I’ve owned several pairs of the legendary AR-9s and these do indeed stack up well against them. Please read the following carefully, as I will only answer questions about this particular pair of speakers, and only questions not already addressed in the listing. The cabinets are free of scratches and have only a few very minor dings. All drivers are completely free of any damage and work without any issues. Both amps also function perfectly without any issues at all. The foam woofer surrounds is still very stiff and firm with no signs of aging or deterioration. The mid surrounds are rubber and will never wear out. The tweeters are protected from dust and damage by a fine gauze and are mint. The foam baffle and waveguide ring around the mid and tweeter units is still good, though not mint, as seen in the photos. Nothing that will in any way effect performance. The one issue is some cat damage to the cloth on the front grills, one worse than the other. Such minor damage is difficult to photograph, but please examine the photos closely if this is an issue. There is no damage to either side grill covering the woofers. The speakers will be sealed in stretch wrap and well-packed in double walled boxes. They will be entirely surrounded by solid sheets of Styrofoam. Further info on the speakers. 96 dB sensitivity, so they require very little power. Great for low powered tube amps. Sunfire internal amplifier in each speaker designed by Bob Carver. Rated 500 watts at 0.1% THD. 85% efficient, with built in excursion limiter, dynamic compressor, thermal rollback limiter, active low-frequency equalization, infrasonic filtering, and auto signal sensing amplifier turn-off. 15 polymer treated paper woofer with 4 lb magnet structure. Two-layer, long-throw 4 voice-coil with aluminum former and vented pole-piece for heat dissipation. Dual 5 1/4 monocoque aluminum/magnesium alloy mid drivers in D’Appolito configuration, housed in separate enclosure. 3/4 particle board construction with picture-frame internal bracing. One 1 titanium-dome tweeter. Two 5.25 aluminum-alloy cone midrange drivers. One 15 side-firing, acoustic-suspension woofer powered by an internal 500W RMS amplifier. 100Hz active low-pass, 24dB/octave. Passive high-pass at 120Hz, 12dB/octave. 2.5kHz high-pass, 12dB/octave. Frequency response: 20Hz-20kHz, ±3dB. Nominal impedance: 8 ohms. Woofer amplifier distortion: 0.1% THD at rated output. Woofer amplifier S/N ratio: 90dB ref. Weight: 84 lbs each. The item “Acoustic Research P315 HO Speakers with Sunfire 500 watt amps (pair)” is in sale since Monday, October 02, 2017. This item is in the category “Consumer Electronics\TV, Video & Home Audio\Home Speakers & Subwoofers”. The seller is “stevemichael_59″ and is located in Los Angeles, California. This item can be shipped to United States.

• Brand: Acoustic Research

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