A 3-way that will play along with the rest of the Dayton RS series designs I’ve done, but on a little smaller footprint. This is a great match for the Khan-center orin a home-theater, or stand-alone for stereo listening.

Bass response is solid. These are full BSC (perhaps a mistake… sigh.) No bloat unless they’re right on a wall, otherwise very clean but very full bass. It just disappears into “out of range” once it’s gone. RS drivers take a helluva beating though, so you can push these silly with adequate power behind them. Definitely very strident, detailed, forward midrange – not for those that really really like their BBC dip, though increasing the value of the series resistor on the mid can help adjust this.

A little more reasonably sized by most standards, the box design is fairly simple. Bracing can be increased or adjusted (beneficial in most circumstances) but be sure to leave room for the crossover! It’s not small.

Response extends with an f3 in the mid-30’s, very flat (+/- 1.5dB) with clean and even off-axis. Measurement here is gated and does not fairly represent the low end, though it is un-smoothed and does accurately represent overall on-axis response. Deep reverse nulls, phase tracks very close from woofer to tweeter.

Nominal 4ohm impedance, this is a reasonably easy load for an amplifier.

Bill of Materials

  • (2) RS28A-4 or RS28F-4
  • (2) RS150-8
  • (4) RS180-8
  • (2) 1.5μF capacitor
  • (2) 3μF capacitor
  • (2) 6.8μF capacitor
  • (2) 9μF capacitor
  • (4) 10μF capacitor
  • (2) 27μF capacitor
  • (2) 36μF capacitor
  • (2) 100μF capacitor (combine with 10μF for 110μF)
  • (2) .25mH inductor (.15Ω)
  • (2) .30mH inductor (.157Ω)
  • (2) .55mH inductor (.227Ω)
  • (2) .9mH inductor (.296Ω)
  • (2) 2.750mH inductor (.391Ω)
  • (2) 5mH inductor (.8Ω)
  • (4) 2Ω resistor (10W+)
  • (4) 12.5Ω resistor (10W+) parallel for 6.25Ω on mid
  • (2) 10Ω resistor (10W+)

Mid enclosure walls lined with a chunk of loose fiberglass (needed). Woofer box is lined-walls and fiberglass above the port (there’s a brace there that keeps it from falling, so little hands can play in the 3″ port and not have glass issues…)