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Questions about LWA1000 Bass Amp (Channels, Tubes & Impedance)

Discussion in 'Bass Amps & Cabinets' started by Charlie Pugh, Dec 11, 2014.

  1. Charlie Pugh

    Charlie Pugh

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    It looks like a wonderful amp head. I just ordered one.

    Can you plug-in two guitars, one into each channel, and play both at the same time (e.g. as with vintage 2 channel Fender Amps).

    Does the LWA 1000 have any tubes (I don't think it does)? Any tube-like characteristics?

    Say you have two identical speaker cabinets, except one contains an 8 ohm speaker and the other an 4 ohm speaker of the same model. You connect the 8 ohm cabinet to the LWA 1000 (gain mid position, flat, compressor off, no effects), adjust to suitable volume (Volume knob) and record bass playing. Then you disconnect the 4 ohm cabinet and connect the 8 ohm cabinet, adjust to a similar output volume (Volume knob) and record bass playing. What then is the difference, if any, in the characteristics and tone of the sound.

    I realize that a 4 ohm load gives maximum power of 1000 watts, 8 ohm gives 500 watts. So I suppose that to get the same output volume with an 8 ohm cabinet compared to a 4 ohm cabinet, you would have to turn up the volume knob.

    On the premiereguitar.com site, Jeff Bober discussed the technicalities of voice coil wiring and then summariezed, " Can the same model of speaker in different impedances sound different? In a word, yes. Substantially different? Probably not. But there is the possibility of a subtle difference… Generally, any perceived difference might be that the (higher ohm) speaker could be a bit brighter."

    Does Jeff Bober's above conclusion apply to the the perceived sound/tone of the combination of the LWA 1000 Bass Amp with the 8 ohm versus the 4 ohm cabinet?

    The LWA 1000 does not have separate speaker outputs, one for 4 ohm and another for 8 ohm but has just one for 4 ohm and above. How does having separate outputs (e.g. as on my Mesa Guitar Amp Heads) compare to just one?
     
  2. DiMarco

    DiMarco nutcase Good Vibe Sponsor

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    1. Yes you can plug in two instruments and use both at the same time.
    2. No it hasn't got any tubes or tube like characteristics.
    3. Theoratically a 4 ohm cab will simply be louder then an 8 ohm one. There might be little differences but only marginally and not caused by the amp itself (with tube/valve amps this is a different story)
    4. Having multiple speaker outputs instead of one has no impact on the sound whatsoever, simply daisychain your two cabs.
     
  3. schlobodan

    schlobodan Warwick Streamer Specialist Good Vibe Sponsor

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    I'd like to add to 3 that this has something to do with the output transformer usually found in tube amps. E.g. Hellborg Poweramps
    have an output transformer even though they are solid state.

    So - no the LWA 1000 does not have an output transformer
     
  4. Charlie Pugh

    Charlie Pugh

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    Thank you for the information!
     
  5. Charlie Pugh

    Charlie Pugh

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    I don't understand. How does presence or absence of a power transformer effect the characteristics and tone resulting from 4 ohm compared to 8 ohm cabinets? (Sorry, I don't know clearly what to ask!)
     
  6. DiMarco

    DiMarco nutcase Good Vibe Sponsor

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    Power transformers are designed to handle one particular load (2, 4, 8 or 16 ohms) and will either break or sound bad if you hook up your cabs incorrectly.

    For this reason on tube/valve amps you often see one 4 ohm output and two 8 ohm outputs. It is still safe to hook up two 8 ohm cabs to a 4 ohm output though. As long as the total load on the output is correct everything is fine.
     
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