Hi Seamaster

There are very few HX1s left around these days, whereas there are plenty of Spectra’s and their variations, which also sell at a much higher price then the HX1, so you have answered your own question.

The difference between the 2 was the way they generated sound, the HX1 used FM synthesis and the Spectra used Wavetable synthesis. (Exception was the drums on the Spectra which used samples)
If you were in to more of a synth type of sound then the Yamaha was probably the better, (Some fantastic brass sounds on there also) however if you were more into acoustic/Orchestral (Including Organ) sounds, the Spectra was the more realistic of the 2.

In the end it’s all down to personal choice as to which you prefer, (If you want to hear an HX1 sing, go and have a listen to Tony Stace, as it still produces some great sounds in his hands) and as to price, (New) when you added all the features on both instruments the prices were about the same.

Also note that in the UK and Europe the Spectra outsold the HX1.

Regards

Bill