Had both of these installed in my car today and let's just say WOW! That SAZ1500d is a beast! I got a chance to really see what my RE HC/Fi Q hybrid could really do. I heard and felt low notes in songs that I didn't before. Both of these are very clean and noise free. There was a very slight hint of engine whine with my previous amps but with a direct swap out there was absolute silence.
Great design and excellent quality.....thanks Jacob....