JBL Monitors are the obvious choice to get the "70's" sound if thats what your after. These were the speakers used in almost every studio to create the albums from that time period...hence the term "Studio Monitors". So THIS is the sound as was intended at the time of the creation of the music. How do you get more truthful and accurate as that?Sorry, this is nonsense. That was the sound that might have been possible in the recording studio at the time, but rest assured if they had better equipment like we have now, they would have used it. Having run a studio in the 1970s (and still run one now) I was only too well aware of how limited JBL monitors were at the time. So we did a lot of headphone listening to get around the limitation of the monitors, and often took the recordings to better systems to see what they actually sounded like.
Its never been my experience that any of the LPs of that period sound better when played only on a particular speaker, especially one made in the 1970s. Most speakers of that era had significant breakups and aren't that nice to listen to at volume. The more **neutral** your speaker, the better those 70s LPs sound. I play lots of vinyl from the 1970s at audio shows and they sound great on horn speakers made in the 21st century, no worries.