Demonstrating accuracy in the temporal domain; having rapid decay of transient signals; uncoloured by resonances whether structural or Helmholtz.
In that case, without information on the processing (or lack thereof), it's impossible to say for certain. It looks to me like the Gjallerhorn has some ringing in the hundreds-of-Hz range, which is out of band for that cabinet - ie, it wouldn't be excited during typical use.
FWIW, your definition of "clean" is quite different to most. In general, it refers more to harmonic distortion.
Chris
FWIW, your definition of "clean" is quite different to most. In general, it refers more to harmonic distortion.
Chris
