Systems ListDIYTC Sounds LMSR12 Dual 12" VMP

System typePassive Radiator
DriverTC Sounds LMS-R 12
Driver Size12 "
Number of drivers1
Internal volume2.4 ft3
External volume3.63 ft3
Dimentions (Width Height Depth)19 " 15 " 22 "
Weight90 lbs
Native Tuning Frequency13 Hz
Aprox. Price$900 USD


This system is tuned lower than optimum and is an exercise to see how low a small enclosure could be tuned. This was also used to compare with a sealed alignment and a tapped horn using the same driver over the 10-100Hz range. Without the very low 13Hz tuning the PR system would not be able to effectively compete down to the <15Hz range for the comparison test. In practice we recommend a higher tuning point that will yield more SPL from the bass reflex design in a more meaningfully way. Tuning passive radiators this low often makes the system perform nearly identical to a sealed design so there are marginal benefits. Full mass was used on the 12" VMP's to yeild the low tuning point of about 13Hz. 15" VMP's will fit into this enclosure but cannot reach a low enough tuning for this test due to the larger surface area. See the article for the full comparison.