wadda ya think??? Yamaha or QSC power amp

Discussion in 'Amps and Cabs [BG]' started by bassguppy, Jul 2, 2005.

  1. Ive been playing with the idea of upgrading from my QSC RMX1450 to something with more power that I don't have to bridge. I have an Ashdown ABM210 & ABM115. Each can handle 300 watts but when I run the QSC in stereo at 8 ohms I clip the 115. SO, now I bridge the amp but I like to be able to control each cab separately.

    I know the reputation of QSC but the 2 negatives about the QSC for me are the weight and the loud fan.

    I've searched and there isn't much on the Yamaha out there. I've read that the amp can't be bridged into 4 ohms but if I can put 500 watts stereo into each cab I should be happy.
    What do you think of the Yamaha specs? The weight is also a big positive.

    Right now I definately lean to the QSC but would like to see what others think. To deal with the QSC weight issue I may get a 2 space rack for the amp.

    And as always, other suggestions are most welcome (but I'd prefer to keep it in the $700 or less category).

    THANKS and I apologize for the long post.

    RMX 2450 $599.00 from most online stores

    Stereo Mode (EIA: both channels driven)

    8 ohms EIA 1 kHz 0.1% THD

    4 ohms EIA 1 kHz 0.1% THD

    2 ohms EIA 1 kHz 1% THD

    Bridge Mono Mode
    8 ohms EIA 1 kHz 0.1% THD

    4 ohms EIA 1 kHz 1% THD

    Signal to Noise (20 Hz-20 kHz)
    100 dB

    Distortion (SMPTE-IM)
    Less than 0.02%

    Input Sensitivity @ 8 ohms
    1.23v (+4.0 dBu)

    Voltage Gain
    50x (34 dB)

    Output Circuitry
    Class H

    Current Consumption (1/8 power pink noise at 4 ohms @ 120VAC,
    both channels driven; multiply current by .5 for 230V units.)

    Weight (Net)
    44.5lb. (20.2 kg)

    Distortion (typical)
    20 Hz-20 kHz: 10 dB below rated power
    1.0 kHz and below: full rated power
    Less than 0.03% THD 4 and 8 ohms
    Less than 0.03% THD 4 and 8 ohms

    Frequency Response
    20 Hz-20 kHz, ± 0/-1 dB, -3 dB points: 5 Hz-50 kHz

    Damping Factor (1 kHz and below)
    Greater than 300 at 8 ohms

    Input Impedance
    10 K ohms unbalanced, 20 K ohms balanced

    Input Clipping
    10 Vrms (+22dBu)

    Continuously variable speed fan, rear-to-front air flow

    Connectors (each channel)
    Input: Active balanced; barrier strip, XLR and 1/4" (6.3 mm).
    TRS tip and XLR pin 2 positive
    Output: "Touch-proof" binding posts and Neutrik Speakon

    Front: AC switch, Ch.1 and Ch.2 gain knobs
    Rear: 10-position DIP switch

    Amplifier Protection
    Full short circuit, open circuit, thermal, ultrasonic, & RF protection.
    Stable into reactive or mismatched loads.

    Load Protection
    Turn-on/off muting, AC coupling (850, 1450), triac crowbar
    (2450, on each channel)

    YAMAHA P5000S $599.00 from most online stores


    Output Power
    1kHz, THD+N=1% 8 Ohms Stereo: 525W + 525W
    1kHz, THD+N=1% 4 Ohms Stereo: 750W + 750W
    1kHz, THD+N=1% 8 Ohms Bridge: 1500W
    20Hz-20kHz, THD+N=1% 8 Ohms Stereo: 500W + 500W
    20Hz-20kHz, THD+N=1% 4 Ohms Stereo: 700W + 700W
    20Hz-20kHz, THD+N=1% 8 Ohms Bridge: 1400W
    1kHz, 20mS nonclip 2 Ohms Stereo: 1300W + 1300W
    1kHz, 20mS nonclip 4 Ohms Bridge: 2600W
    Power Bandwidth (half power): 10Hz-40kHz (THD+N=0.5%)
    THD+N (20Hz - 20kHz, half power): Maximum 0.1%
    Intermodulation Distortion (60Hz: 7kHz, 4:1, half power: Maximum 0.1%
    Frequency Response: 0dB, +0.5dB, – 1dB f=20Hz-50kHz
    Channel Separation: Minimum 70dB 1kHz
    Residual noise (Att. min.): Maximum 70dB
    S/N Ratio: 103 dB
    Damping Factor: 350 max.
    Sensitivity @8 Ohms +6dB
    Voltage Gain (Att. max): 32.1dB
    Input Impedance: 30kOhms balanced; 15kOhms unbalanced
    Front Panel: POWER switch (push on/push off) attenuator (31position) x 2
    Rear Panel:
    FREQ. CONTROL (25Hz-150Hz) x 2
    Input: XLR-3-31 type/ch, 1/4"
    Output: SPEAKON, 5-way biding post, 1/4" phone/ch
    POWER: x 1 (Green)
    PROTECTION: x 1 (Red)
    TEMP: x 1 (Red) heatsink temp 85°
    YS PROCESSING: x 1 (Yellow)
    SIGNAL: x 2 (Green)
    CLIP: x 2 (Red)
    Load Protection:
    POWER switch on/off mute
    DC-fault power output cut
    Amplifier Protection:
    Thermal (heatsink temp 90°C
    VI limiter
    Limiter Circuit: Comp. THD 0.5%
    Cooling: Dual variable-speed fan / Single variable-speed fan
    Power Requirements: USA/120V 60Hz
    Idle Power Consumption: 35W
    1/8 Power Consumption: 550W
    Maximum Power Consumption (4 Ohms): 3000W
    Dimensions (W x H x D): 18-7/8" x 3-7/16" x 17-15/16"
    Weight: 26 lbs
  2. dood


    Dec 9, 2004
    sitting down,facingforward..UK
    Endorsements: Shuker Guitars, Dingwall Designer Guitars, D'Addario, Planet Waves, Barefaced Bass
    Hi there! I am a P5000 user and am VERY happy with it.

    The variable crossover on each channel is a god send. for example, i put my SVP preamp on with the yammi and it knocks the svt4 into a cocked hat.
    I can decide exactly what frequencies go to each cab. for my accugroove 2x10, i roll off the bottom end at 25hz. now when I am cranking the amp VERY hard and VERY loud, my cones are not forced into over excursion.. more.. well.. walk in the park for em!!
    I can dump all the lows into a bottom cab, or maybe send full range to it with the other amp channel.
    there is a switch that you can turn each channel intoa SUB amp or a High Pass amp or full range. very handy.
    ALSO this amp is one of the few that has binding posts AND speakons AND 1/4" jack sockets for speaker outputs. Most amps only have 2 of these choices.

    The yamaha processing is great. Not sure what is going on, but it adds a bit of eq i think. sounds good, but not necessary when using Accu cabs.

    I'd say the features make this amp a prime candidate if you need a flexible rig.

    For the cash you cant go wrong. the amp weighs next to nothing. you have Yamaha's reputation for good quality stuff. I have bought yamaha before and I probably will in the future.

    heh heh.. and there's no silly dip switches that you cant see on a dark stage in the back of ya rack!! everything is clearly labelled and you can get your hands on the selectors/dials easily should you need to change anything in the event of problems or the need to reconfigure quickly.

    I chose the Yamaha as the price here in the UK and the features that the Amp offered were too good to miss. I even turned down the behringer because it was not as flexible as the Yamaha.

    It is silent when it should be and it accurately transmits what is put into it.

    Other power amps I look at include Behringer, EV, crown DB, Mackie & studiomaster.

    My choice for a power amplifier was based on Weight, Cost, Reputation and flexibility. (not necessarily in that order!!)
    If you want extra OOOPHH then the P7000 looks like an absolute steel!!

    I hope this helps. please ecuse my grammar etc.. its now00.53 and i'm feelin' a weee bit tired!! ;o)
  3. Munjibunga

    Munjibunga Total Hyper-Elite Member Gold Supporting Member

    May 6, 2000
    San Diego (when not at Groom Lake)
    Independent Contractor to Bass San Diego
    Don't like the weight? PLX.