assuming the same speed....7 and 1/2ips, the difference between 2 and 4 track is mainly that 2 track is double the width; which yields a wider bandwidth, greater dynamic range, and correspondingly lower noise floor.
what that does in reality is that 4-track does not quite measure up to better vinyl in my system; whereas 2-track can equal or even slightly better 33rpm vinyl in my system. this is based on the better examples of 2 and 4 track tapes i have heard.
15ips can surpass the best of my vinyl; but not 100% of the time. the source of that 15ips tape must be a 15ips master dub in good condition and the dub needs to be very well done.
i'll grant that there are aspects of tape replay which the 4-track has which i do enjoy such as the continueousness that set it apart from vinyl in some cases. but the 4-track also has a higher noise floor than my vinyl. the 4-tracks i have are very inconsistent.
i almost never listen to a 4-track tape as with 12,000 Lps why would i?
i do have three very good tt's and 2 high quality phono stages so Lps do perform quite well in my system. if i had a more modest vinyl front-end maybe my viewpoint on how 4-track (or even 7 and 1/2ips 2-track) compared might be different.
