As mentioned, the electronics will play a part, but you'll find the Spendors a little more laid back than the PMC's, which will come across more lively, particularly at the lower end.
I find the Spendors more evenly balanced and preferable for my listening, but if I was limited by volume, the PMC's would definitely be on the audition list.
David
Frank Harvey Hi-Fi Ltd - now on Facebook (search Frank Harvey Hi-Fi)