Here are a number of major differences between the IC-756Pro II and the IC-746Pro (IC-7400). Many of these comments also apply to the 756Pro.
The IC-756Pro/Pro II has a real-time Spectrum Scope module (actually a mini-spectrum analyser with 1 kHz RBW @ -6dB) which is completely independent of the main receiver. The IC-746Pro "borrows" the main receiver to perform a band sweep for the spectrum-scope display (non-real-time). The receiver is muted during the sweep.
The IC-756Pro/Pro II has two independent physical 1st local oscillators (synthesisers), allowing Dual Watch operation (simultaneous reception on two frequencies in the same band and mode). The IC-746Pro lacks this capability.
The IC-756Pro II has a stronger RF front end than the IC-746Pro or the IC-756Pro.
The IC-756Pro and Pro II use the ADI SHARC DSP; the IC-746Pro employs the TI DSP. The DSP performance in the two radios is similar, although the 746Pro's ADC's are a little noisier.
The IC-746Pro has 2m capability; the IC-756Pro/Pro II do not.
The IC-746Pro has a monochrome dot-matrix type LCD display, whilst the IC-756Pro and Pro II have a full-colour TFT display.
The 756PROII has a built in voice keyer, whereas the 746pro does not.
Voice-activated squelch, receive tone controls and a graphical SWR/frequency plot are offered on the IC-746Pro, but not on the IC-756Pro or Pro II.
Some reviewers have stated that the 756Pro2 has somewhat better receiver "numbers" than the 746Pro. There is a discussion of this on Oba JA7UDE's IC-7400 Page.
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Last updated: 02/27/2010