香蕉视频直播

Listening

The Polk MM651鈥檚 are very easy to install, you simply mount the speaker, connect the crossover to the appropriate spade lugs for the mid and tweeter, and connect the amp. No adjustments are possible.

After installing the system in my listening room鈥檚 panels, I connected them to my reference amp and did some listening. Beginning with the Marc Cohn tracks 鈥淲alking in Memphis鈥� and 鈥淧erfect Love鈥�, I was quite surprised at the high level of sound quality considering the price. The system had very good warmth and clarity. I thought the upper midrange was ever so slightly accentuated, but nothing approaching strident or unpleasant. And when I sat off axis, this was much less noticeable, so perhaps the engineers at Polk realize that most of these speakers are going to be placed low in a car door, and simply designed for it?听

Moving on musically, I listened to Robby Robertson鈥檚 鈥淪omewhere Down the Crazy River鈥�. The opening of the song has a sense of space and movement that few car audio speakers can capture, but once again, the Polk鈥檚 surprised me with a really decent reproduction of the recordings ambience. I listened to a bunch more stuff, as I generally do when I鈥檓 enjoying myself. From AC/DC to Valdy, the Polk鈥檚 handled it all in stride, and did very well. Couple these speakers with a decent woofer, and you鈥檒l have the entire spectrum well covered. If I was to really pick nits, I thought there was a hint of sibilance from time to time, especially when pushed hard, and the minor issue in the upper midrange would occasionally make a snare drum or sax riff have a tiny bit more bite than it should but these are small complaints indeed. I had to repeatedly remind myself that these Polk speakers were under 200 bucks, and at that price, they鈥檙e exceptional!

Technical Measurements听

With the listening session over, I moved the system into my loudspeaker measurement room, and measured the on-axis frequency response. The system is quite flat, with a small bit of a dip around 8500Hz. The dip is narrow enough to be of little consequence, but it may explain a bit of what I heard earlier.

As you can see from the system impedance graph, the MM651 does have a bit lower than normal impedance but certainly won鈥檛 pose a problem even for a head unit amplifier.

Conclusion

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