What is here:
- Pictures and unbaffled distortion measurements for Dayton RSS315HF-4 subwoofer.
- 3-way dipole speaker system, with low cost electronics.
Bought Dayton 12" reference series subwoofer to add low end power to 3 way dipole speaker. A picture of the test setup is below:
Below a picture showing rear venting. Not shown is vented spider. Note massive cast frame.
Sine wave distortion measurement, with the woofer unbaffled. Input power approximately 36 watts. Cone excursion .25 in peak, 6 mm peak. 2nd harmonic at 60 Hz is -21dB. No significant other harmonics .
Increased cone excursion to 9 mm peak. The red trace is when the back vents are obstructed. This causes some high frequency scratching sounds. 2nd harmonic is -17 dB, 3rd harmonic is -28 dB.
Increased cone excursion to 13 mm, which is very close to the rated 14mm maximum linear excursion. 2nd harmonic -13 dB, 3rd harmonic -21 dB, 4th harmonic -28 dB.
Conclusion: Apparently an outstanding woofer for the price lives up to marketing claims.