I have a few pairs of 4313Bs so I familiar with them and have seen the travel of the woofer with the grill off. I have had a pair of Sony TA-N80ES amps hooked up to them. Always sounded good no issues. They are rated at 200 watts per channel. In place of the Sonys I swapped in a recently overhauled Marantz 1250. I'm not really familiar with it nor had past experiences with it. I do know it's rated at 125 watts. I have 2 questions I will pick your brains on. 1st the bass improvement is like night and day. I mean the bass slam is fast and hard compared to the Sony's. Did not expect that. The woofer travel distance was substantialy greater than the Sony's and based on my recollection it was greater than the Harman Kardon 16.......Why.
2nd question. I got out an old tried and true SONY 4300 turntable from my Navy Days to test the Phono board on the Marantz as it was also rebuilt. I don't use the turntable as often as I like to but the woofer travel is now not only still greater but I get a feeling that the woofers are even spazzing out a bit. It just didn't seem to be traveling like they should although it sounded ok. Switched over to CD and the woofer travels back in forth like it should.......like its pulsating. So I think that irregularity may be caused by the turntable needing a tuneup or something. It worried me enough not to want to play the turntable. The cartridge is original so it's about 30 + years old.
P.S. These questions are not a prelude to a future for sale post. This one I'm keeping. Hoping that some turntable guru's can help with the 2nd question.