M&K Sound S300 Speaker System Test Bench

Test Bench

L/C/R Sensitivity: 90.5 dB from 500 Hz to 2 kHz

Surround Sensitivity: 86.5 dB from 500 Hz to 2 kHz


This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the S300 L/C/R (purple trace), S300T surround (red trace), and X12 subwoofer (blue trace). All passive loudspeakers were measured with grilles at a distance of 1 meter with a 2.83-volt input and scaled for display purposes.

The S300’s listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +1.36/–2.09 decibels from 200 hertz to 10 kilohertz. An average of axial and +/–15-degree horizontal responses measures +2.04/–0.99 dB from 200 Hz to 10 kHz. The –3dB point is at 76 Hz, and the –6dB point is at 63 Hz. Impedance reaches a minimum of 4.14 ohms at 6.0 kHz and a phase angle of –57.82 degrees at 96 Hz.

The S300T’s three-face averaged response measures +1.35/–2.43 dB from 200 Hz to 10 kHz. The –3dB point is at 93 Hz, and the –6dB point is at 78 Hz. Impedance reaches a minimum of 3.92 ohms at 2.1 kHz and a phase angle of –61.92 degrees at 111 Hz.

The X12’s close-miked response, normalized to the level at 80 Hz, indicates that the lower –3dB point is at 24 Hz and the –6dB point is at 18 Hz. The upper –3dB point is at 207 Hz in THX mode.—MJP

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mnc's picture

M&K were the first speakers I ever lusted after. I remember wanting the S-100B setup when they were around $1000/each. I can't believe how expensive their speakers have gotten!

javanp's picture

Maybe there is a distinct increase in performance over the S-150s but I think M&K is making some pretty poor business/marketing decisions here... a lot like Atlantic Technology has done, but perhaps even worse so than what they did. Both companies had an iconic speaker, the 350 for AT and the S-150 for MK. However, both companies later came out with upgraded, better speakers of that model, but at a DRASTICALLY increased price. These new models really don't differentiate themselves from the old models in any substantial way, not from an aesthetic perspective at any rate. Now that doesn't mean that the actual parts and design of the speakers don't justify the cost increase. But when you're increasing your top-of-the-line speaker from $500 to $2,500 (I think that was AT's price increase from the 350s to the , people just expect it to be bigger and better.

trynberg's picture

javanp, MK Sound still sells the S-150s...this is a new higher level line.

David Vaughn's picture
You are correct. This is a higher end line for the company.
biaubill's picture

Quick question: I just finished reading the S&V article, "What Makes a Good Center Speaker." Doesn't this comb filtering issue apply to these M&K speakers since the mid-drivers and tweeters are positioned horizontal to each other, like a center speaker? And why would Styrofoam be needed between the tweeters when sitting closer to the speaker? I am seriously considering purchasing these speakers, but now I concern about comb filtering issues, especially for such expensive speakers. I hope somebody can answer my questions. Thank you!