Best Of

Nobody else is obstinate around here lol. 😆 I recall f1 telling people who were all happy with their new M10 purchase that it wasn't a very good speaker, not just once or twice too. And SL1000 and SL2000s which were Polks first tweeters suck. So cut Denis a little slack for being opinionated about his M4s so far. You all praised him for his M7 thread and he is not giving up on these in case you haven't noticed. Maybe there is something yet to be uncovered that is wrong with the inductor values, tweeter polarity, enclosure damping materials.........other possibilities. All you cronies that say you have had these speakers and not one suggestion out of any of you.

Denis check the midwoofers for suspension sag. Mine from the same era that are currently in my 7Bs, that are now modded with phase plugs and Armacell inside, are from parted out M4s and they sound fantastic. If the voice coil isn't centered it won't have the same xmax in both directions and could have a voice coil that starts to leave the gap. That'll mess up the sound big time. Mine measure 0.735 in. from the rear of the mounting flange to the point of the cone where the dust cap meets the cone.

Looks like I have enough wire left over from an other project to do the insides of both of these 👍

Picture before I replaced the magnet screws with button socketed heads. They were #8-32. I wouldn't be surprised if yours are metric. My back plate smooth silver, no dimple, no flats.



Older one with illegible date code after button heads........some of the paint was so old it flaked in the process

Those Danish made ones always seem to have a nice semi gloss black coating on the bezels and a post sandblasted(?) yellow zinc chromate plated finish.

One of my oldest ones with a date on it is a #25143577, probably made in USA. Flat Black bezel, smooth silver zinc plating.

Yours (total height w/o dome) 0.9595 Mine 1.062
Yours (magnet O.D.) 2.8475 Mine 2.798

Lighten up, Francis. You said, “it was garbage as it came from Polk originally.” That’s what I was responding to. And yeah, I’ve owned Monitor 4’s. As I’ve said many times on this forum, probably most recently when I reviewed the L200’s, I couldn’t believe what those little boxes produced, particularly the bass, and I think they may be my favorite of the monitors from that lineage other than the Monitor 7’s. I just recently gave them to a friend of mine in Colorado Springs who loves them as well. I’ve had pretty much all those Monitors and still have a pair of Monitor 5 Peerless, Monitor 7 Peerless, Monitor 7C’s, and I own or have owned a boatload of other Polk as well as other bookies, up to and including L200’s. And I’ve owned stereos since about 1970, so I dont have to rely on articles from that time period, I’ve lived it Sparky. If someone wants to disagree on the relevant merits of a speaker so be it, beauty is in eye of the beholder, but the Monitor 4’s were not garbage as they came from Polk originally.

The cabinets are not even 7” deep. With the original crossover almost touching the magnet and all the foam stuffed in between it completely muffles the bass and lower mids.

I’m sure creating that space behind the woofer is going to dramatically change the sound of these speakers.