Question about vintage Marantz 22xx power output

I am looking to purchase a vintage Marantz receiver off of ebay except i'm having trouble figuring out which one I need (power wise)! I will be using bookshelf speakers for the time being, but would like to move up to something bigger in the years to come. So I guess I need something that would work decently in both cases. I found a really nice 2225 but that doesn't seem like it would be much power when it comes to bigger speakers.

I found a couple really good ones that I could buy: 2225, 2238, 2245

My dad has an old kenwood ka-3500 (40wpc) which is more than enough to run a pair of classic advent loudspeakers. Other than that, that's really all I have to go off of.

I guess an option is to i'll buy the 2225 for now and then in a couple years if I decide to go bigger I can get one with more power!

Any insight is greatly appreciated!

Last 2 digits are watts per ch. 2270 = 70 watts per ch. 2252 52 watts per ch. The 2325 is 125 Watts per ch..These are RMS watts[The Real Thing] and usually put out more than advertised.Do an internet search.There is a site that has them all listed.JD
Counter-intuitively, it's the large speakers that often don't need as much power to reach a high SPL. Many bookshelf speakers have a sensitivity rating in the 83-86dB range. A 25 wpc receiver could only drive a speaker with 83dB efficiency to about 98 dB. OTOH, a humongous Klipschorn or La Scala hits 105 dB on 1w input. 25w would drive them to about 119 dB, which is LOUD! As for modern designs, some of the 6- and 7-foot tall line arrays have sensitivity ratings in the mid-90s.

Bob Carver designed the original Phase Linear 700 (350 wpc) with the dominating "bookshelf" speaker of the day, the AR 3a, which had a sensitivity rating of 83 dB. Bob knew a speaker like that needed 200-350 wpc to come alive.

Just about any small bookshelf speaker with good bass response achieves it by padding down the volume of the upper range so the bass can be heard. Bookshelf speakers, especially acoustic suspension designs, are notoriously inefficient. The other things said about the vintage Marantz receivers are true. They are pretty well built, have good current delivery, and have good oomph at whatever their power ratings are.

And not all smaller speakers are inefficient; but at 25wpc the more efficient the speaker, the more the music will come alive.
Awesome, exactly what I wanted to hear! Thanks
The 2230 and 2270 come to mind as classics, I had a 2230 which sounded great with a pair of Epi bookshelf 6" models (until it broke - 1 channel just blew out and I never got it fixed).
I used a 2252B for several years of flawless service. Passed it along a couple of years ago to a friends son that was returning from Iraq who wanted to build a vintage system.

I have read several posts by vintage Marantz enthusiasts and they seem to agree that the 2238 is an especially nice sounding unit.
Vintage Marantz
I'm driving a pair of a/d/s L620's with a Marantz 2238b with stunning results. The 38w/ch is more than enough to fill the 14x20 room that houses my vintage system.