[Don]

Reply received from Dynatech regarding db reduction and power loss:

Copy of e-mail:

Usually you can expect a 1 to 3 dB reduction in noise using the cone. The power loss is minimal if any. These are results taken from use of cones in many forms of racing. The power loss if any will usually be no more than 1%. Of coarse this will vary from system to system.

Thank You for your interest,
Greg @ Dynatech