SONY SS-7220A Speaker System Pair

This is a 3-way speaker system, the SONY 7225A. I used to listen to records on them. I'm selling them as part of decluttering. All units are free of tears and have been tested for sound output. Regarding sound quality, I have not performed precise measurements with equipment.

The saran nets are free of tears. There are signs of sun fading. They originally cost 40,000 yen each.

This is a bookshelf speaker system featuring Sony's unique low-distortion magnetic circuit.

It incorporates Sony's proprietary low-distortion magnetic circuit. This magnetic circuit reduces non-linear distortion caused by magnetic materials by implementing two improvements: a notch in the center of the center pole and the addition of a thick copper plating or copper cap in that area.

For cone speakers, abnormal vibrations in the voice coil bobbin and the bond between the bobbin and the cone radiate abnormal sounds at very high levels in the frequency range 2 to 3 times the limit frequency of high frequencies. Therefore, by adopting a dust cap with significant sound insulation characteristics, the radiation of abnormal sounds is prevented.

The low frequencies are handled by a 25cm cone woofer, and the mid-frequencies by a 10cm cone midrange driver.
The diaphragms are made from carefully selected Nordic pulp, suppressing sound muddiness caused by breakup vibrations.

The high frequencies are reproduced by a 2.5cm dome tweeter.

The network section uses large air-core coils with low DC resistance that do not distort even with high input.

The mid and high frequencies are equipped with continuously variable level controls that can be adjusted to match the room's acoustic characteristics.

The enclosure is made of 20mm thick hard particleboard.

As these are very old speakers, they will be shipped via Art Household Goods Delivery. I cannot be held responsible for any malfunctions during transport. Therefore, please only purchase if you understand and agree to a no-claims, no-returns policy. Please contact us in advance if you are in Hokkaido, Okinawa, or remote islands. Thank you.