I posted this in a Sire P7 BASS thread as a update to my having bought a new P7-5 alder/rswd, whiterecently. But I'm repeating some of that reply here as it may be more helpful to some. Not sure too many are installing flats on their very lively sounding Sire basses. But they work very well, for me. Still zingy and didn't mess with the P7-5's mojo, in fact it improved it for me.
I'm a wuss when it comes to SS strings and even the softer, nickels on some basses I gig. They just trash my fingers, so I moved to tapes and Chrome flats on most of my basses. I do like what the stock nickels were giving me tone-wise on the Sire. But I stopped giggin it for abit because again, my wussy, wittle fingers hurt afterwards so much.
So I ordered some Chrome flats for it. I put them on today. I had a bear of a time sliding the last bit of the low B string thru the whole in the bridge, it just wouldn't pull thru. So I had to trim most of the silk wrapping off the ball end of that string to make it pull thru, whew, then it went thru with a good tug. Thought I was going to have to drill out the bridge hole some at first. I did string thru bridge, not body. Only bought the longs; not super longs. Didn't affect this bass' great tone at all, it improved it to my ears.
I was afraid I might loose the great, biting, snappy tone of the P7, in active mode, with the flats; not at all. It still sounds great and I love the sticky feel of these Chromes that just seems to give me more control at my finger tips. The bass still sounds the same and darn if the intonation stayed right on the money as before.
I'm really impressed with the Sire bass. I may still get a M3 or the very popular V7 to compare. The P7 18-ish string spacing makes it abit harder for me to slap, mostly use 19mm, but I'm getting better at it. Oh and I just added a DarkGlass B3K-V2 pedal and man it gives this bass a lovely, glassy high end that really stands out. Just a subtle touch of OD that makes it sound really special, band mates love it. So do I. peace ya'll. e