Internal Design and Acoustic Performance

I am sure that most of you are willing to know what is hidden beneath the beautiful piano lacquered surface. Before we get to the actual tests, let’s take a look inside the system by removing eight screws on the back of the right satellite:

As soon as we opened the system we saw that the external casing is 16mm wide and the internal capacity of the satellite is 7l. The satellites have no sharp edges, the rounded shape is created with special cutting technique and there is a cross-piece in the upper part of the case. All electronics, except the frequency separation filters, is placed on the back panel of the right satellite case. Note that there is no lining of sound-absorbing material inside.

The phase-inverter port is set at 50Hz, but it turned out too loud because of the too small diameter, especially when you are listening to it at over 10W power (you can notice some side sounds).

During the test session we detected some bouncing sound at 300Hz frequency, which could be the internal case resonance (standing waves). The woofer impedance graph in box and in free air demonstrates evident presence of resonance peaks. I believe that internal lining with sound-absorbing material could help solve this problem.

Low-frequency and high-frequency separation filters (from left to right).

Filters inside the satellite case.

Principal circuitry for separation filters: high-frequency drop ?C3, low-frequency ?C2.