Best Of
FOR SALE: ATI Amplifier AT3000 3007 7 x 300 Watt
Fully balanced amplifier from ATI made in USA in California. 300 Watts into 8 ohms, 450 Watts into 4ohm. AT3007, SEVEN Channels. Two Toroidal transformers! Heavy duty. Replaced my Emotiva XPA-5 and blew it out of the water. Looking to go in a different direction with Class D and save my back from this 140lb monster.
In good working condition. One binding post is partially broken but workable with banana plugs and bare wire.
ATI is the manufacturer for larger manufacturers such as Outlaw, Mark Levinson, Adcom, Lexicon
ATI's "Pure Balance"® technology introduces a range of models that feature true differential design; balanced from input to output. This design allows the quietest and purest reproduction of the audio signal. Power output is 300 Watts RMS/channel into 8 ohms from 20Hz to 20kHz with no more than 0.03% THD and I.M. distortion.
Remote Trigger:
Activated from 3.3VDC to 24 VDC via a heavy-duty relay.
Protection Circuits:
Optically coupled with full automatic reset.
Toroid Transformers:
40% more efficient than EI type. Separate bi-filar windings for each channel guaranty lower noise and crosstalk.
Circuit Boards:
Double-sided, FR-4 glass-epoxy, computer-grade boards are assembled in-house.
Soft Start Circuitry:
Ultra soft turn on reduces in-rush current to a minimum. Multiple units can be turned on without tripping circuit breakers eliminating the need for sequencing.
Power Transistors:
High-current, bi-polar output transistors with active bias circuits result in effortless operation.
Power Cord:
Detachable, 3-wire cord, 20 amp circuit.
7 Year Warranty:
Parts and labor against defects in parts or workmanship.
Dimensions:
17"w X 8.75"h X 18"d (chassis)
Local Pick up in 92677. ASKING 2300.
In good working condition. One binding post is partially broken but workable with banana plugs and bare wire.
ATI is the manufacturer for larger manufacturers such as Outlaw, Mark Levinson, Adcom, Lexicon
ATI's "Pure Balance"® technology introduces a range of models that feature true differential design; balanced from input to output. This design allows the quietest and purest reproduction of the audio signal. Power output is 300 Watts RMS/channel into 8 ohms from 20Hz to 20kHz with no more than 0.03% THD and I.M. distortion.
Remote Trigger:
Activated from 3.3VDC to 24 VDC via a heavy-duty relay.
Protection Circuits:
Optically coupled with full automatic reset.
Toroid Transformers:
40% more efficient than EI type. Separate bi-filar windings for each channel guaranty lower noise and crosstalk.
Circuit Boards:
Double-sided, FR-4 glass-epoxy, computer-grade boards are assembled in-house.
Soft Start Circuitry:
Ultra soft turn on reduces in-rush current to a minimum. Multiple units can be turned on without tripping circuit breakers eliminating the need for sequencing.
Power Transistors:
High-current, bi-polar output transistors with active bias circuits result in effortless operation.
Power Cord:
Detachable, 3-wire cord, 20 amp circuit.
7 Year Warranty:
Parts and labor against defects in parts or workmanship.
Dimensions:
17"w X 8.75"h X 18"d (chassis)
Local Pick up in 92677. ASKING 2300.
aboroth00
1 ·
Re: Strictly Jazz - Suggestions and a discussion about the music.
My favorite Miles Album, Workin’ With:
I know everyone who likes Jazz, knows Miles Davis, but if you haven’t heard this album, you need to.
I know everyone who likes Jazz, knows Miles Davis, but if you haven’t heard this album, you need to.
headrott
2 ·
Re: An "Identify these trees, if you please" post. :)
One tree I never saw when I lived in NH years ago was the Sycamore. Yet a couple states away they're plentiful. I remember thinking they were huge beech trees when I first moved to southern NE.
motorstereo
2 ·
Re: Westmassguy's Idea: Employing Damping to Mitigate Comb Filtering and Lobing
Just for kicks I thought I would list everything I have done to these speakers:
-Replaced binding posts with Cardas posts on black painted aluminum discs.
-Added a layer of dampening material between crossovers and top of cabinet.
-Westmassguy crossover rebuild with Sonicaps/Mills resistors.
-Sonic Barrier as described above.
-Replaced stock internal wiring with Neotech 14 gauge stranded OCC wire.
-Dynamat on woofer/passive radiator baskets, and inside of binding post plate.
-Epoxied driver magnets.
-Added screws to passive radiators where Polk did not install them.
-Replaced driver and passive radiator gaskets.
-Sealed the cabinet with Loctite Power Grab.
-Filled the inside of the crossover coil spools with Mortite to add weight/mass.
-Filled the inside of the 12 inch Polk Stands with sand and epoxied them together.
-Speakers are decoupled from stands with Herbie's Audio Labs "Big Fat Dots".
-Stands decoupled from wood floor with Herbie's Audio Labs "Little Fat Gliders".
-Periodic application of Deoxit Gold to connections, fuses etc.
In order of impact, the greatest gains came from David's crossover rebuild, the damping work described above, replacing the binding posts, using the Herbie's Big Fat Dots, and replacing the internal wiring. The other stuff adds up as well, especially isolating the crossover from vibration noticeably improves resolution. I wish you folks could hear these speakers, Matthew Polk would get a kick out of them for sure.
-Replaced binding posts with Cardas posts on black painted aluminum discs.
-Added a layer of dampening material between crossovers and top of cabinet.
-Westmassguy crossover rebuild with Sonicaps/Mills resistors.
-Sonic Barrier as described above.
-Replaced stock internal wiring with Neotech 14 gauge stranded OCC wire.
-Dynamat on woofer/passive radiator baskets, and inside of binding post plate.
-Epoxied driver magnets.
-Added screws to passive radiators where Polk did not install them.
-Replaced driver and passive radiator gaskets.
-Sealed the cabinet with Loctite Power Grab.
-Filled the inside of the crossover coil spools with Mortite to add weight/mass.
-Filled the inside of the 12 inch Polk Stands with sand and epoxied them together.
-Speakers are decoupled from stands with Herbie's Audio Labs "Big Fat Dots".
-Stands decoupled from wood floor with Herbie's Audio Labs "Little Fat Gliders".
-Periodic application of Deoxit Gold to connections, fuses etc.
In order of impact, the greatest gains came from David's crossover rebuild, the damping work described above, replacing the binding posts, using the Herbie's Big Fat Dots, and replacing the internal wiring. The other stuff adds up as well, especially isolating the crossover from vibration noticeably improves resolution. I wish you folks could hear these speakers, Matthew Polk would get a kick out of them for sure.
Jazzhead
1 ·
Re: Post a video... any video
This Cullman guy deserves not only your respect but also your money !
'merica ! 🇺🇲
https://youtu.be/q-RLqLx1iYI?si=MqWW20CwOPAP3-XT
'merica ! 🇺🇲
https://youtu.be/q-RLqLx1iYI?si=MqWW20CwOPAP3-XT
mrbigbluelight
1 ·
Re: Original RTA 12 Specs
Gardenstater wrote: »Found this in Oct 1979 High Fidelity, but drats no nominal impedance given. Freq. response was 27 Hz to 20.5kHz +/- 2 dB, which is pretty incredible. It appears you have the original stands shown in the advertisement, with the rounded corners.
Thank you so much! They do have the MW6500's and Peerless. I actually found these in a thrift store and I walked around the corner after an employee set them out. I called my wife to bring a cart and had to fight off a coupe of folks. I lost one badge in the process but the wife of the man who dropped them off was in-front of us in the check out line. She said they bought them new in early 80's and they have been his babies since. He apparently got new speakers and she tried to call him so we could chat. However, she left the house because of how loud he was listening to music so he missed the call. Thanks for the information and looking for me! They are really fantastic speakers.
oldhifi
3 ·
Re: Strictly Jazz - Suggestions and a discussion about the music.
Going back to 1966. This is one of my favorite Wayne Shorter albums that I hope will appeal to many. Shorter is the only horn player on this album and it showcases his writing abilities and his lyrical, nocturnal, style of playing. There are many cuts on this album that have aged very well over the decades, including 502 Blues, Footprints, and Chief Crazy Horse. Every performer on this album is dripping with talent, it was very well recorded for it's time, and the Rudy Van Gelder remaster is a treat:
Jazzhead
1 ·
Re: An "Identify these trees, if you please" post. :)
Going by the bark, leaf shape and color, and general location, I'm fairly certain those are young Chest of Drawers, Kitchen Pantry, or Toothpick Trees.
msg
7 ·