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heavyosonic's heavyosonic System
Last Update: December 14, 2001 at 13:17:13 IP Address:
Amplifier: dual ampex monoblock tube amps model 9901 (late 1950's w/ ef86, 6v6gta, utc transformers) approx. 12-15 watts output each. originally used in the first ampex video tape recorders as the audio monitor amps.
Preamplifier (or None if Integrated): naim nac32 with homemade psu.
Speakers: vintage jbl c40 folded exponential horns with 150-4c 15" woofer. rated about 30 watts continuous power. sensitivity approx. 100dB/W@1m.

vintage jbl 2397 wooden horns with jbl 375 compression drivers. rated 60 watts continuous power, sensitivity approx 108 dB/W@1m. output reduced 6 dB with crossover min output setting.

vintage jbl 2405 slot tweeters rated 20 watts continuous power, sensitivity ?? hi-passed with .68 uF caps

vintage jbl n400 crossovers (500 Hz)
all drivers alnico magnet type.

CD Player/DAC: denon dn600f.
Turntable/Phono Stage: ariston rd-40 with alphason xenon arm (cardas internal wires) and grado 8MZ cartridge.
Other Source(s): vintage studer a-80RC 1/4 inch 2 track. adb digital pro 24 computer soundcard. dyna fm-3 tuner. tascam da-30 mkII dat deck.
Other Accessories/Room/Misc.:
Speaker Cables/Interconnects: DIY cat5 speaker wire (3 foot run from amp to crossover).

kimber pbj interconnect from preamp to poweramps.

canare interconnect from phono to preamp.

Other (Power Conditioner, Racks etc.): homebuilt turntable support.
enjoythemusic alignment protracter. bubble level, spl meter.
Room Size (LxWxH): 15 x 12 x 9
Room Comments/Treatments: needs more dampening in the mids. needs to be bigger.
Music Preferences and Comments:
Music Used (Genre/Selections): mid-century jazz (miles, monk, rollins, etc.) modern techno and electronica, african, classical, some newer rock artists like radiohead, beck. old stuff like hendrix, elvis costello, some floyd, old stones. some hip hop. reggae.
System Goals/Comments: aiming for realistic dynamics, lifelike sonic resolution and detail, high level of musical involvement.
would like to upgrade turntable and cartridge for even more information from the disc. would like to build some stepped attenuators for my power amps.
System Strengths: great dynamics and impact even at lower listening levels. lots of revealing detail. fairly neutral sound. bad recordings sound bad. good recordings sound good, whatever the type of music.
original pressings of some great music!
can reproduce live sound pressure levels - great for jazz. very full range coverage.
wide sweet spot due to dispersion pattern of midrange horns.
System Weaknesses: cd player lacks depth and vitality. only seems to suit certain types of music (electronic mostly, some classical) subsequently not used much.
room is a bit lively, could use some more stuff to damp the sound which would improve imaging. a thick rug would be a good start, but pets, ya know...
system has a bit of a rise around between 7 and 10kHz when sitting in listening position. not too troublesome really as it's not a spike but a fairly smooth bump. standing in listening position eliminates this rise.
Video/HT System: None
URL Link: http://modena.intergate.ca/personal/cml/pics/system/system.jpg
Other Interests/Hobbies/Occupation: musician by genetic programming. recording engineer/producer by trade. computer geek by choice.

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