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technical question

Discussion in 'Amps, Mics & Pickups [DB]' started by Marc Piane, Oct 31, 2010.


  1. Marc Piane

    Marc Piane

    Jun 14, 2004
    Chicago
    So on a whim I tried one of the speakers from a yamaha stagepas 300 I have with my AI Clarus at a gig the other night and was really pleased with the result. The speaker worked great as it is a 8" and tweeter design in a molded plastic and very compact box. Mostly I was just fooling around but was very pleased with this very compact setup.

    My question is this, with the below information what is the ohm rating of one of the speakers? The AI is rated down to 2 ohms so I'm sure it's fine. Also, how much do I have to worry about frying the cab? I mostly would use it for low volume jobs. Just curious.

    150 W+150 W/6 Ω @10 % THD at 1 kHz (SPEAKER L/R)±15 dB
     
  2. drurb

    drurb Oracle, Ancient Order of Rass Hattur; Mem. #1, EPC

    Apr 17, 2004
    This looks like the rating off the back of the amp, yes? Seems to indicate 150 watts output on each channel into 6 ohms (with high distortion and incompletely stated frequency response). In any case, given that the amp is spec'd into 6 ohms and it comes as a package with those cabs, it's likely that they're nominally 6 ohms. The greatest danger would be driving the cones right off their frames with the AI because those drivers probably can't handle much power at very low frequencies. You should be fine at very low levels. You'll hear the drivers complain when they get near their limits. :)
     
  3. Marc Piane

    Marc Piane

    Jun 14, 2004
    Chicago
    I got it from the manual. Here's the total specs if it helps.

    ■General Specifications
    Maximum Output Power
    150 W+150 W/6 Ω @10 % THD at 1 kHz (SPEAKER L/R)
    100 W+100 W/6 Ω @1 % THD at 1 kHz (SPEAKER L/R)
    Frequency Response
    -3 dB, 0 dB, +1 dB @20 Hz–20 kHz, 1 W Output/6 Ω (Without
    MUSIC/SPEECH, EQ and SP EQ Circuit) (SPEAKER L/R)
    -3 dB, 0 dB, +1 dB @20 Hz–20 kHz, +4 dBu 10 kΩ Load
    [MUSIC/SPEECH]switch=MUSIC (MONITOR OUT, REC OUT)
    Total Harmonic Distortion
    1 % @1 kHz, 50 W Output Power (SPEAKER L/R)
    0.5 % @20 Hz–20 kHz, +14 dBu 10 kΩ (MONITOR OUT, REC OUT)
    Hum & Noise (20 Hz–20 kHz, Rs=150 Ω, MIC/LINE switch=MIC)
    -65 dBu Residual output noise (SPEAKER L/R)
    -90 dBu Residual output noise (MONITOR OUT, REC OUT)
    -67 dBu @MONITOR OUT control & one CH LEVEL control at nominal
    level (CH1–4)(MONITOR OUT)
    Crosstalk (1 kHz)
    Stereo Input Channel Equalization:
    Shelving turnover/rolloff frequency: 3 dB before maximum cut or boost.
    ±15 dB
    HIGH 10 kHz shelving
    LOW 100 Hz shelving
    ■Speaker
    Enclosure
    Bass-reflex type
    Speaker Unit
    LF: 8" (20 cm) Cone
    HF: 1" (2.54 cm) Compression Driver
    Cross Over Frequency
    4 kHz
    Frequency Range
    55 Hz–20 kHz
    Maximum Output Level
    112 dB (1 m)


    The powered mixer has been acting funny (it got wet) so I haven't really been using it. I bought it used from a friend who used it pretty heavily. I thought maybe the speakers might have another life.
     
  4. drurb

    drurb Oracle, Ancient Order of Rass Hattur; Mem. #1, EPC

    Apr 17, 2004
    Same answer as above. :)
     
  5. Marc Piane

    Marc Piane

    Jun 14, 2004
    Chicago
    thanks
     

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