Sony STR-GX80ES Technical Background - Page 33

sF Fin Heat Sinks Identical aluminum heat sink fins resonate at the same frequency, subtly degrading output transistor performance. That's why the STR-DA3100ES uses a series of vertical ribs, spaced at staggered intervals. This diffuses resonance to maintain sonic integrity. Because the ribs from the letter S, we call this design the "S-form" or "sF" Fin design. The inside of the STR-DA3100 ES, showing the two sets of massive aluminum heat sinks. At this angle, the s-Form ribs appear as circles on the white aluminum heat sink fins. Low-filler speaker terminals The engineers of Sony's ES Series try to look at everything that influences the sound quality, however subtle. Their examinations have prompted us to reconstitute the chemical composition of the speaker terminal lugs. We discovered that a resin with reduced fillers and pigments helps suppress resonance, especially when the audio program gets loud. You can actually see the result of this effort on the back panel, where the speaker terminals no longer have their customary bright red and deep black pigment! ES Receivers v1.0 Page 33