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HiFi Heaven

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About HiFi Heaven

  • Birthday 09/21/1948

Profile Information

  • Gender
    Male
  • Location
    Edina (Minneapolis) Minnesota
  • Interests
    American Roots Music, Accurate LOUD HiFi, Amateur Radio, Bicycling, Cooking, Chicks that like all the above!
  • My System
    Klipsch Line Arrays in Bi-Amped 5.2 System
    Front: L&R Stacked Klipsch KG4 on Forte' IIs
    Rear: L&R Stacked Klipsch KG4 on Quartets
    Center: Two KG2s under Sony 55" HDTV
    SUBwoofers: Two Klipsch SUB-12s L & R
    ADCOM GFA-555 + GSP-6 Front L & R
    ADCOM GFA-7400 Center+Rear Power
    ADCOM GTP-740 5.1 Surround Controller
    American Audio Q-Spand MkII Input Mixer
    Behringer FBQ-3102 1/3-Octave Room EQ
    Behringer DEQ-2496 Equalizer + Analyzer
    dbx 4BX 4-Band Dynamic Range Expander
    dbx 120X-DS SUBHARMANIAC Synthesizer
    24 SQ. FT. CONE AREA RADIATING BASS!
    116dB 24Hz>20kHz - No Clipping Allowed!
    Eats K-Horns for Breakfast, Jubilees 4 Lunch!

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  1. ALTEC MR II 594 is a 500-Hz 3-bolt 1.4" horn with amazing polar response. https://minneapolis.craigslist.org/hnp/ele/d/minneapolis-altec-lansing-mantaray-90/7682005735.html
  2. You might be clipping your amplifier. +6dB bass boost requires 4 TIMES the power! Get a sub.
  3. Try an extension cord plugged into a laundry circuit near your electrical panel. If that helps, the noise is conducted from the source onto your power line.
  4. AudioTool is a cheap 1/12-octave RTA that runs on Android phones and tablets. Includes pink-noise to inject into your amp + sine & square-wave generators. The electret mic in your device is excellent to 10kHz, fine for these tests.
  5. DC [Direct Current] can't produce Hiss, Hum, or ANY sound at all! Test this with a 1.5 V DC battery connected directly to your speaker. The woofer will move once and stay there until the battery is dead, turning the battery DC energy into HEAT, not SOUND. Not a Peep! HUM is usually steady 60 or 120-Hz buzzing from AC power wiring sneaking into inadequately shielded patch cords, or faulty grounding. Ancient tube amplifiers with failing filter capacitors might go "Hmmm" as the owner tells you "It Hums because it doesn't know the Words!" HISS is thermal noise of random electrons partying inside your preamp, you have to turn the volume way up to hear them - they are very small. If you enjoy HISS like I do, get a Ham Radio and talk to me on the air! 73, NØCRE "Can't Remember Everything" FCC Licensed since 1960
  6. Maybe we should listen for Tesla's longitudinal EM waves instead of conventional transverse EM?
  7. Correct polarity can be heard as an increase in volume at crossover frequency on a noise signal, can be seen on an audio real-time spectrum analyzer like AudioTool on your phone or tablet. Out of phase produces a pronounced dip at crossover as opposing acoustic waves cancel.
  8. HiFi Heaven

    Amateur Radio

    NØCRE "Can't Remember Everything" near Minneapolis 100 watts SSB 20/40/75M + 50 watts FM 144/440 MHz
  9. 90dB is fine, requires less than one watt. KG3.2 sensitivity is 94dB at 3 feet at 1 watt. They will last a lifetime. 119dB is NOT OK for KG3.2's! That level would require 250+ watts, they are rated 65 watts long term. Poof!
  10. Those fuse values offer NO protection for your speakers, MKAZ. See my earlier comment about fuse specs - it takes a while to blow a fuse at 200%. Or save yourself the trouble, just keep the volume below the threshold of distortion.
  11. Hi MKAZ - 4Ω is normal DC terminal resistance for many Klipsch "8Ω" speakers. DCR at the input terminals = woofer DCR + negligible lowpass inductor resistance. Zero DC current flows through the crossover network to Mid, Tweeter, or Ground. Static 4Ω DCR rises to 6-8Ω AC in the bass musical range inside a tuned enclosure. Be aware a 3A fuse offers no protection for 1" voice coils - start with 1.25A fast blow. We used 3A fuses to protect commercial ALTEC 100-watt woofers with 3" voice coils. Music is dynamic. Fuses are rated to blow within 10-30 seconds after 200% overload. Way too late for your charcoaled voice coil...
  12. Maybe some of our members could characterize the superiority of JEM capacitors vs. other brands on an objective basis with measurements of value, tolerance and ESR, rather than subjective jargon? I'm ready to recap 12 vintage Klipsch, looking for advice based on experience, not opinion. Thanks!
  13. DC Ω resistance is ALWAYS less than AC impedance, sometimes a lot less. Quick test: swipe a 9-volt battery across the terminals, the cone should JUMP. Reverse the battery polarity, speaker cone should jump in the opposite direction. Use a 1.5 volt battery to test compression drivers - 9 volts might damage them.
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