CSS RT1 and LAR1 Ribbon Tweeters

Filed under: Home Audio > DIY Raw Drivers > Tweeters



CSS continues to roll out products and lately it seems like every month there is something new. Most recently, CSS unveiled their SDX7 and SDX10. Now CSS has used their long-standing relationship with world-renowned ribbon manufacturer Aurum Cantus to develop two new ribbons that are available immediately.

The two new models are the RT1 and LAR1 with both models using a new
honeycomb aluminum diaphragm rather than the typical corrugated ribbons
used in the past. The claim is lowered distortion, which is a good move
for a ribbon tweeter. The RT1 is available with a square or round
faceplate, while the LAR1's rectangular faceplate and high efficiency
make it a good match for line arrays.

The RT1 comes in at $100 plus shipping, while the LAR1 is priced at $229 plus shipping. More data for each follows. Distortion measurements, waterfall plots, and FR measurements are also available on the CSS website.



RT1 Aluminum Ribbon Tweeter
Impedance: 6ohms
Rated Power: 30W
Sensitivity: 91dB/W/m
Frequency range: 1700Hz-30 kHz
Dimension of ribbon (mm): 8.5W×60L×0.015T
Shape of ribbon: Non-corrugated honeycomb
Mass of ribbon：16mg
Moving area of ribbon: 510 square millimeter
Gap flux: 0.55Tesia
Recommended crossover frequency: 2500Hz
Material of faceplate: aluminum
Dimension of faceplate (mm): 125mm×4T
Outside dimension (mm):125mm X 125mm ×84D
Net weight: 0.98kg/pc
Alternate square faceplate: 106mm X 106mm X 6mm



LAR1 Aluminum Ribbon Tweeter
Impedance: 6ohms
Rated Power: 60W
Sensitivity: 95dB/W/m
Frequency range: 1400Hz-30kHz
Dimension of ribbon(mm): 8.5W×130H×0.015T
Shape of ribbon: Non-corrugated honeycomb
Mass of ribbon：34mg
Moving area of aluminum ribbon: 1105 square millimeter
Gap flux: 0.58Tesia
Recommended crossover frequency: 2200Hz
Material of faceplate: aluminum
Dimension of faceplate(mm): 80W×168H×4T
Outside dimension(mm): 80W×168H×76D
Net weight: 1.6kg/pc