A 4ohm ph410 would be killer. And you can't beat a Stingray through a Mesa rig! I have an 8 ohm version and the M9 has so much grunt that power and head room are just not a concern. I have never gigged the ph410 as I have my ph412 which is arguably easier to move around despite being a lot larger. I do really like the 410 tone but have been spoiled for the mesa 12's as they just seem to allow the mids to shine through. My 410 is going nowhere though!
I have a M9+PH410 4ohm bass cabinet and use a Music Man Stingray 4 string Bass and have used this rig on every stage size from the corner bar to large outdoor festival stages and can say that this bass rig can beyond cover any live musical situation you can thow at it... As a weekend warrior with over 30 years of giging experience under my belt, I have learned that I actually need more volume in my rig than a world stage touring musican because you don't always have the luxury of being run through the house system and or a monitor mix... When it's just you against the guys and a P.A. on a stick in a large field or a street festival or a large convention room, you have to be able to keep up with the pack and not worry about not having the fire power when you need it...
This bass rig is as versatile as any bass rig you could find, and at the end of the day, it does it's job without breaking a sweat which is more than I can say for myself... It's esthetics are truly amazing and the compact size of the entire bass rig are a plus for fitting it and my P.A.(Bass players always own the P.A.) in my Honda Element without any trouble... There will always be a discussion group on what gear is the flavor of the week... But when you get down to the real question's:
"Does it sound like the bass sound that I want to be identified by as my sound? And, will it work flawlessly and dependably gig after gig"
When you can answer yes to these question, you have arrived at the Mesa Boogie Bass Rig of your dreams...