I went from Spendor BC-1's to SP-1's, and in my system it was quite an improvement. The SP-1s are more efficient, more dynamic, image much better, and seem to have a more natural tonal balance. As you might expect, they retain a lot of the BC-1 qualities as well - you know right away that you are listening to a Spendor. They also have the same footprint as the BC-1's in terms of height and floor space, and can use the same stands. You do sacrifice a little bit of detail in the upper mids and highs however, although not much.
However, I must stress that I heard these differences within the context of my own system, including a relatively low powered Scott 222c integrated amp (about 24 wpc). Also, my BC-1's were very old and may not have been in tip top-shape. Some also assert that in the BC-1 days there was much more sample-to-sample variation, so we might be talking about differences other than those caused by the actual model change.
Whatever you decide, I would urge you to try to audition any contemplated replacement speakers in your own system. Otherwise, there are just too many variables to deal with -
component interaction, sample-to-sample variation, room interactions, your individual priorities in listening, etc. BC-1's are a classic speaker with many strengths, and if you aren't very particular, you might end up trading sideways or even downwards.
However, I must stress that I heard these differences within the context of my own system, including a relatively low powered Scott 222c integrated amp (about 24 wpc). Also, my BC-1's were very old and may not have been in tip top-shape. Some also assert that in the BC-1 days there was much more sample-to-sample variation, so we might be talking about differences other than those caused by the actual model change.
Whatever you decide, I would urge you to try to audition any contemplated replacement speakers in your own system. Otherwise, there are just too many variables to deal with -
component interaction, sample-to-sample variation, room interactions, your individual priorities in listening, etc. BC-1's are a classic speaker with many strengths, and if you aren't very particular, you might end up trading sideways or even downwards.