I have a late 90's NS4CR and love the sound of it. I believe Spector was using a 9 volt EMG preamp back then, is that correct? I haven't had an opportunity to play a newer Czech Spector since they were revised, but they use an 18 volt Aguilar preamp nowadays, is that right? I was just wondering from you owners out there...what is the difference in sound, if any? Would you say the 18 volt Aggie sounds better or worse than the older 9 volt EMG pres? or roughly the same? Anyone prefer the older EMG pre? and why?