Vintage 10-inch subwoofer 75GDN-1-4(30GD-2) from speakers Radiotehnika S90 made in Riga - Latvia during the USSR
The price is for 1 speaker
Details: Details: You are bidding on the well-preserved 75gdn-1-4(30GD-2) woofer from the Radiotehnika S90 speakers, manufactured at a factory in Riga-Latvia during the USSR era.
Conditions: The 75GDN-1-4(30GD-2) speaker was installed in the Radiotehnika S90 35AS-012, 35AS-212 speaker systems as a subwoofer. It has proved its worth in its frequency characteristics. It is still used as a subwoofer for home or for a car. On the Internet There are many options on how to calculate the size of the box and make a subwoofer from this speaker yourself. The speaker in excellent condition has not been used much and is well preserved both externally and technically. It is fully operational and proven. Very high-quality soft bass.Please see the photos. This is a private sale. I do not give a guarantee and cannot guarantee further use. You get what you see in the photo, video.
Vintage Soviet Subwoofer Radiotehnika S90 75GDN-1-4 (4ohm) Made in the USSR
Video will open in a new window
Using the eBay App? Paste link into a browser window:
Attention, if you are unable to open the video on eBay, you can copy the link under the video and paste it into any Internet browser to view it.
Specifications: Manufacturer "Radio Engineering" Riga. Appointment: It is applied in the closed case with a phase inverter in speaker systems of high complexity as a low-frequency link. Available in two versions with a nominal impedance of 4 ohms (75 GDN-1-4) and 8 ohms (75 GDN-1-8)
Electrodynamic type loudspeaker head, low frequency, round, with unshielded magnetic circuit. The diffuser holder is made by injection molding of aluminum alloy. The cone diffuser is made of impregnated paper pulp. Suspension - torroid shaped - made of rubber. Centering washer made of impregnated fabric.
Characteristics:
Frequency range: 31.5 - 1000 Hz
Frequency response in the range 63-1000 Hz: 10 dB
Sensitivity: 86dB
Sound pressure: 1.26 Pa
Harmonic distortion at operating power:
40 Hz: 5%
63 Hz: 4%
above 80 Hz: 3%
Resistance: 4 ohm
Power Limit: 75W
Long-term power: 78W
Short-term power: 80 W
Main resonance frequency: 25Hz (± 5Hz)
Total Q factor: 0.35 (± 0.05)
Size: Ø250x124 mm
Weight: 6 kg
The magnetic circuit consists of a 25BA170 ring ferrite magnet with dimensions K134 x 57x12 MM; core with a diameter of 49.7 mm; top flange with a 53.7mm hole. The height of the air gap is 9.8 mm, its radial width is 2 mm, the induction in the gap is 0.87 T.
The moving system includes: a voice coil wound with a PEVTL-1 wire with a diameter of 0.28 mm, two-layer winding, in the first layer - 53 turns, in the second 51, winding height 22 mm, ohmic resistance 2.9 ± 0.3 Ohm. The frame of the voice coil is made of copper tape DPRNT 0.05 x 40. The height of the ZK is 41.6 mm, the inner diameter is 50.7 mm, the outer (with winding) is 52.6 mm. Cone diffuser made of impregnated paper pulp. A toroidal suspension made of rubber. Centering washer made of coated fabric.
Payment: I accept payment via PayPal.
Dispatch: Before you buy, please contact me to clarify information about sending to your country.The goods are well packaged by me and sent from Ukraine by the Air Carrier with a tracking number. All orders are processed and dispatched within 5 business days.
I still have such a speaker and other components for the Soviet speaker system Radiotehnika S90, Vega, Amphiton.
I will be happy to answer any questions and add photos or information upon request. Please feel free to ask.
Thank you for your interest!