Speaker 75GDN-3 (30GD-2)

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Speaker 75GDN-3 (30GD-2)

75GDN-3 (30GD-2) - loudspeaker head of electrodynamic type, low-frequency, round, with an unshielded magnetic circuit.

Warranty period: 1.5 years. Technical specifications: LVG 3.843.015 TU

Designed for use in closed phase-inverted remote acoustic systems of the highest and first complexity groups as a low-frequency link in rooms. The diffuser holder is made by injection molding from aluminum alloy.

The magnetic circuit contains the following elements:

— Ring ferrite magnet brand 25BA170×2K size K134x57x12 mm; — Core with a diameter of 50 mm; — Top flange with a hole with a diameter of 53.6 mm. Air gap height 9.6 mm; radial width of the air gap is 1.8 mm, induction in the gap is 0.87 T.

The mobile system includes:

— Voice coil wound with PEVT-1 wire with a diameter of 0.355 mm, double-layer winding, 53 turns in the first layer, 51 turns in the second, winding height 22 mm; Ohmic resistance 2.9+-0.3 Ohm; The voice coil frame is made of DPRNT 0.05×40 tape. ZK height 40 mm, internal diameter 50.7 mm, external (including winding) 52.7 mm; — Conical diffuser of variable thickness, made of impregnated paper pulp; — Toroidal-shaped suspension made of polyurethane; — A spherical cap made of impregnated paper pulp.

Specifications:

— Reproducible frequency range — 31.5-1000 Hz; — Nominal sound pressure — 1.26 Pa; — Uneven frequency response of sound pressure — 10 dB; — Level of characteristic sensitivity — 86 dB; - Total harmonic distortion coefficient when supplying power corresponding to the nominal average sound pressure at frequencies of 40 Hz - 5%; 63 Hz - 4%; over 80 Hz - 3%; — Nominal electrical resistance — 4 Ohms; — Maximum noise (nameplate) power — 75 W; — Maximum long-term power — 78 W; — Maximum short-term power — 80 W; — Main resonance frequency — 25+-5 Hz; — Full good power — 0.35+-0.05;

Dimensions: 250×124 mm; Weight: 6 kg.

Speakers 75GDN-3 were installed in the following acoustic systems:

— Amphiton 50AS-022;

Soviet speakers

Speakers of the USSR (table list) Old - marking of speakers according to the old GOST. New – speaker marking according to the new GOST. Range – effective range of reproduced frequencies, in Hz. Sensitivity and SPL – sensitivity and sound pressure (in parentheses). The first value in the cell is sensitivity, the second is sound pressure (always in parentheses). Specified in dB. Sometimes sound pressure is indicated in Pa or bar. R – nominal electrical resistance, in Ohms. Dimensions – overall dimensions of the speaker, in mm. The dimensions are indicated in the plan (diffuser to us). First, the dimensions in plan are indicated (the first two numbers), then the depth. If the speaker is round, then the size is indicated in diameter, the second number indicates the depth. Weight – the weight of the speaker, in kg. * The list contains not only speakers that were produced during the USSR period, it also contains new developments from the same factories.

Old

New	Range [Hz]	Feelings (SPL) [dB] Read also: How to properly connect an active and passive subwoofer to a car	R [Ohm]	Dimensions [mm]	Weight [kg]
0.025 GD-1	600 – 4000	6	40x16.5	0,017
0.025 GD-2	1000 – 3000	60	40x16.5	0,017
0.05 GD-1	700 – 2500	60
0.05 GD-2	700 – 2500	6,5
0.1 GD-1 VEF	450 – 3000	3,5
0.1 GD-3	400 – 3000	6,5	50x20.5	0,035
0.1 GD-3M	630 – 3150	10	50x20.5	0,035
0.1 GD-6	450 – 3150	(0.23 Pa)	10	?60x27	0,06
0.1 GD-8	440 – 3000	10	60x21.5	0,04
0.1 GD-9	450 – 3150	(0.18 Pa)	60	?50?14	0,0165
0.1 GD-12	450 – 3150	10
0.25 GDSh-1-10	450 – 3150	91,5	10	?60x28	0,058
0.1 GD-17	0.25 GDSh-2-50	450 – 3150	90	50	?50x18	0,03
0.1 GD-17M	0.25 GDSh-3-8	450 – 3150	83	8	?50x13	0,025
0.15 GD-1	400 – 8000	6	60x22	0,05
0.15 GD-3	150 – 5000	6
0.2 GD-1	300 – 10000	(0.18 Pa)	?60x25
0.25 GD-1	300 – 10000	(2 bar)	6	60x25	0,05
0.25 GD-1 RRZ	300 – 3000	8	72x34	0,07
0.25 GD-2	300 – 3000	25	70x29	0,12
0.25 GD-9	300 – 3500	10	70x36	0,12
0.25 GD-10	0.5 GDSh-1-8	315 – 5000	91	8	63x63x29.5	0,07
0.25 GD-19	0.5 GDSh-2-8	315 – 5000	90	8	63x63x22	0,13
0.5 GDSh-4-8	450 – 3150	87,4	8	?50x18	0,03
0.35 GD	4,3
0.5 GD-2	120 – 6000	2.5 bar	5,5	?124
0.5 GD-5	100 – 6000	3 bar	5,5
0.5 GD-10	150 – 10000	2.3 bar	5	160x50	0,15
0.5 GD-11	150 – 7000	5	105x36	0,15
0.5 GD-12	150 – 7000	4,5	105x36	0,25
0.5 GD-14	250 – 3500	28	102x50	0,13
0.5 GD-15	150 – 7000	28	102x50	0,128
0.5 GD-17	250 – 5000	8	106x70	0,15
0.5 GD-17B	250 – 5000	8	106x70	0,15
0.5 GD-20	315 – 5000	8	80x34
0.5 GD-21	315 – 7000	8	80x37
0.5 GD-30	1 GDSh-1-16	125 – 10000	93	16	125x80x47	0,19
1 GDSh-2-16	200 – 10000	91	16	125x80x47	0,19
0.5 GD-31	200 – 10000	15	125x80	0,19
0.5 GD-36	1000 – 16000	(0.15 Pa)	10	80x80x34.5	0,08
0.5 GD-37	1 GDSh-3-8	315 – 7100	92	8	80x80x37.5	0,135
0.5 GD-42	160 – 12500	8	?125x38	0,3
1 A-10 KinUp	80 – 8000	15	?225x165	10,5
1 A-13 KinUp	400 – 10000	22	?185x165	13,6
1 A-16 KinUp	500 – 14000	12	126x124x162	7,3
1 A-17 KinUp	800 – 12000	22	?141x95	6
1 A-20 KinUp	800 – 14000	25
1 GD-1	150 – 5000	2.5 bar	3,6	150x75	0,7
1 GD-1 RRZ	4000 – 13000	10	105x63	0,26
1 GD-1 VEF	200 – 4000	6,5	90x57	0,2
1 GD-2	150 – 5000	3,6
1 GD-2 VEF	1000 – 15000	90 (0.2 Pa)	6,5	90x57	0,25
1 GD-3 RRZ	5000 – 18000	93,5 (96,5)	12	?70x34	0,18
1 GD-4	100 – 10000	8	150x100
1 GD-4A	160 – 10000	93	8	150x100x60	0,33
1 GD-5	150 – 6000	6,5	126x50	0,37
1 GD-6	100 – 6000	6,5	126x53	0,6
1 GD-7	150 – 6000	6	124x64	0,6
1 GD-8	200 – 6000	6	124x64	0,4
1 GD-8A	160 – 10000	90	125x125x55	0,34
1 GD-9	200 – 10000	(0.2 Pa)	8	156x98x56	0,25
1 GD-10	120 – 7000	6,5	156x98	0,37
1 GD-11	150 – 6000	6,5	126x46	0,3
1 GD-12	200 – 10000	5	156x98	0,2
1 GD-14	150 – 10000	5	?125x45	0,18
1 GD-17	100 – 7000	220
1 GD-18	100 – 10000	6,5	156x98	0,2
1 GD-19	100 – 10000	6,5	156x98	0,2
1 GD-20	150 – 7000	6,5	156x98	0,24
1 GD-28	100 – 10000	6,5	156x98	0,2
1 GD-36	100 – 10000	90	8	160x100x58	0,27
1 GD-37	100 – 10000	8	160x100	0,27
1 GD-39E	200 – 6300	8	100x100	0,2
1 GD-40	100 – 10000	(0.27 Pa)	8	160x100x45	0,31
1 GD-40R	100 – 10000	93 (0.28 Pa)	8	160x100x45	0,25
1 GD-40RE	100 – 10000	93 (0.28 Pa)	8	160x100x45	0,25
1 GD-48	2 GDSh-2-8	100 – 10000	93	8	160x100x60	0,33
1 GD-50	1 GDSh-4-8	180 – 12500	90	8	100x100x36	0,23
1 GD-52A	100 – 12500	90	?160x55	0,33
1 GD-54	2 GDSh-3-8	125 – 10000	92	8	125x80x46	0,19
2 GDSh-4-8	125 – 10000	92	8	125x80x42	0,19
2 GDSh-6-8	315 – 12500	88	8	?80x24.5	0,042
1 GD-55	1 GDSh-5-4	200 – 10000	90	4	125x80x36.5	0,19
1 GDSh-6-8	315 – 7100	92	8	80x80x28	0,07
1 GD-56	1 GDV-1-8	6300 – 16000	88	8	40x40x29	0,1
1 GDM-1.5	150 – 15000	3	?150	0,75
1.5 GD-1	150 – 15000	3	?150	0,75
1.5 GD-2	150 – 15000	?150	1,15
2 A-8	40 – 650	18	?394x235	12
2 A-9	40 – 1000	18	?341x195	13,5
2 A-11	35 – 3000	15	?500x190	15
2 A-12 KinUp	40 – 3500	95	12	?341x190
2 A-12 KinUp	40 – 12500	12	?450x190
2 A-14 KinUp	25 – 4000	16	?252x110
2 A-16-1	30 – 3000	95 (0,4)	15	?335x215	8
2 A-12	40 – 3500	12	?341x190
2 GD-3	70 – 10000	4,5	?152x69	0,4
2 GD-4	70 – 10000	5	?152x69	0,3
2 GD-6	90 – 7000	420
2 GD-7	70 – 10000	4,5	?152x62	0,23
2 GD-8	80 – 8000	4,5	264x94	0,28
2 GD-8 VEF	80 – 7000	4,5	?152x75	0,5
2 GD-19	80 – 10000	4,5	?152x54	0,22
2 GD-19M	100 – 10000	4,5	?152x52	0,2
2 GD-22	100 – 10000	92	4	280x88x77	0,45
2 GD-28	70 – 10000	4	?152x55	0,25
2 GD-35	80 – 12500	4	?152x52
2 GD-36	3 GDV-1-8	3150 – 20000	90 (94,8)	8	80x50x40	0,11
3 GDV-2-8	3150 – 20000	88	8	105x64	0,1
2 GD-38	3 GDSh-1-8	100 – 12500	90	8	160x100x59	0,28
2 GD-40	3 GDSh-2-4	100 – 12500	92	4	160x100x47	0,32
2 GD-40A	3 GDSh-2-8	100 – 12500	92	8	160x100x47	0,32
2 GD-45	3 GDSh-4-4	100 – 12500	92	4	160x100x51	0,33
2 GD-45	3 GDSh-4-8	100 – 12500	92	8	160x100x51	0,33
3 GDSh-7-4	180 – 12500	90	4	100x100x36	0,23
3 GDSh-7-8	180 – 12500	90	8	100x100x36	0,23
3 GDSh-8-4	160 – 12500	90	4	?100x32	0,1
3 GDSh-8-8	160 – 12500	90	8	?100x32	0,1
3 GDSh-13-8	160 – 12500	91	8	?100x32	0,1
2 GDM-3	90 – 5000
2 GDP-3	3
3 GD-1 RRZ	150 – 6000	10	?150x52	0,4
3 GD-1	200 – 5000	93,5 (99,5)	8	?150x54
3 GD-2	6 GDV-1-16	5000 – 18000	90 (97,8)	16	63x63x31	0,2
3 GD-3	100 – 6000	3,4	?200
3 GD-3 VEF	100 – 7000	1,6
3 GD-5 VEF	100 – 7000	3,4	202x90	1,3
3 GD-6 VEF	80 – 7000	3,4	202x90	1,3
3 GD-7	80 – 7000	2.5 bar	3,4	208x154	0,65
3 GD-9	80 – 7000	5	204x134	0,9
3 GD-15	1000 – 18000	92 (2.5 bar)	4,5	?105x64	0,27
3 GD-15M	1000 – 18000	92 (2.5 bar)	4,5	?105x64	0,27
3 GD-16	80 – 8000	4,5	204x134	0,33
3 GD-17	160 – 6300	95 (0.4 N/m2)	5,5
3 GD-28	80 – 8000	92	4,5	204x134x55	0,41
3 GD-31	5 GDV-1-8	2800 – 20000	90 (97)	8	100x100x48.3	0,4
5 GDV-108-8	8
3 GD-32	6 GDSh-1-4	80 – 12500	92 (99,8)	4	200x125x76.3	0,48
6 GDSh-3-4	160 – 12500	92	4	125x125x50	0,33
6 GDSh-5-4	100 – 12500	92	4	?125x45.5	0,29
6 GDSh-5-8	100 – 12500	92	8	?125x45.5	0,29
3 GD-38E	5 GDSh-1-4	80 – 12500	90 (97)	4	?160x55	0,31
3 GD-40	5 GDSh-2-4	80 – 12500	90 (97)	4	?160x58	0,4
3 GD-42	5 GDSh-3-4	100 – 12500	92,5	4	125x100x52	0,58
3 GD-42	5 GDSh-3-8	100 – 12500	92,5 (99,5)	8	125x100x52	0,58
3 GD-45	5 GDSh-4-4	80 – 16000	90 (97)	4	?148x55	0,33
3 GD-47	4 GDV-1-8	2000 – 20000	91 (97)	8	65x65x44	0,35
3 GDMP-VEF	100 – 6000	3 bar	1,6
4 A-10	100 – 6000	12	3,5
4 A-15 KinUp	100 – 6000	15	?252x110	3,1
4 A-16 KinUp	100 – 6000	12	?258x130	3,2
4 A-18	100 – 6000	93	15	?258x136	3,2
4 A-26	50 – 8000	93	15	?258x135	2,6
4 A-27	70 – 10000	(0.3 Pa)	15	?258x129	1,5
4 A-28	70 – 14000	93,5 (104,2)	15	?258x129	1,5
4 A-30	70 – 14000	94	6	4
4 A-32	40 – 16000	96 (110)	15	?335x215	10
4 A-32-6	40 – 14000	95 (111,9)	16	6
4 A-33	40 – 18000	95	15	5
4 A-36	80 – 10000	94	16	5
4 A-44	63 – 16000	16	?258x104	5
4 A-46	70 – 14000	93,5 (104,2)	4
4 GD-1	60 – 12000	5,5	?202x100	0,6
4 GD-2	60 – 12000	5	?202x80	0,9
4 GD-2 RRZ	100 – 12000	10	?200x93	0,9
4 GD-3	70 – 7000	4,5	?197x96	1,2
4 GD-3 RRZ	130 – 12000	10	?200x93	0,9
4 GD-4	60 – 12000	93 (100)	8	?202x100	1,5
4 GD-5	63 – 5000	93,5	8	?202x76	0,6
4 GD-6-160	200 – 5000	90 (97)	8	80x80x37	0,34
4 GD-7	63 – 12500	93 (99)	4,5	?202x76	0,43
4 GD-8	100 – 10000	4
4 GD-8A	125 – 7100	90 (96)	4
4 GD-8E	4 GDSh-1-4	125 – 7100	93,5 (99,5)	4	125x125x49	0,62
4 GD-9	100 – 8000	4,5	204x134
4 GD-28	60 – 12000	90 (97)	4,5	?202x71	0,535
4 GD-34	63 – 12000	90 (97)	8	?200x70
4 GD-35	8 GDSh-1-4	63 – 12500	92 (101)	4	200x200x76	0,88
8 GDSh-2-4	100 – 12500	91 (100)	4	?160x54	0,4
8 GDSh-2-8	100 – 12500	91 (100)	8	?160x54	0,4
4 GD-36	63 – 12500	90 (97)	4/12	?200x75.6	0,65
4 GD-43	63 – 5000	92 (99)	4	?125x49	0,6
4 GD-53	5 GDSh-5-4	100 – 12500	92 (99)	4	125x125x49	0,6
4 GD-53	5 GDSh-5-8	100 – 12500	92 (99)	8	125x125x49	0,6
4 GD-53A	4 GDSh-3-8	100 – 12500	92 (99)	8	?125x48	0,4
4 GDSh-5-4	200 – 10000	90 (97)	4	100x100x52	0,25
4 GD-56	6 GDV-2-8	3150 – 20000	90 (97,8)	8	80x50	0,16
4 GD-6	200 – 6000	90	12	?80
5 GD-1 RRZ	80 – 10000	96 (103,8)	4	260x180	0,75
5 GD-3 RRZ	40 – 5000	93,5	10	?252x106	1,38
5 GD-9	70 – 7000	4	?252x126	1,7
5 GD-10	50 – 12000	4,5	?252x126	1,7
5 GD-14	70 – 12000	(0.25 Pa)	4	254x170x100	0,7
5 GD-16	70 – 12000	(2.5 bar)	4	254x170	0,6
5 GD-16	70 – 12000	(2.5 bar)	420	254x170	0,6
5 GD-18	70 – 12000	4,5	254x170	0,45
5 GD-19	100 – 10000	4,5	254x170	0,525
5 GD-28	100 – 10000	4,5	254x170	0,54
5 GED-5	70 – 6500	2	?250x135
6 GD-1	60 – 16000	95 (102,8)	1,2	?222x96	0,5
6 GD-1 RRZ	60 – 6500	96	8	327x225	1,3
6 GD-2 RRZ	40 – 5000	93,5	8	?252?135	1,56
6 GD-2 RRZ	HF (twitter)	100x100
6 GD-3	100 – 10000	96 (103,8)
6 GD-3T	100 – 10000
6 GD-4	100 – 10000	4,5
6 GD-5	80 – 10000	8
6 GD-6	10 GDN-1-4	63 – 5000	84 (94)	4	?125x76	1,5
6 GD-11	3000 – 20000	90 (97,8)	8	50x50x48	0,33
6 GD-13	6 GDV-4-8	3000 – 25000	93,5 (101,3)	8	100x100x45	0,9
6 GDV-5D-4	3150 – 30000	90	4	80x50x30	0,16
6 GDV-5D-8	3150 – 20000	90	8	80x50x30	0,16
6 GD-17	8 GDSh-2-4	100 – 12500	91	4	?160x54	0,4
6 GD-17	8 GDSh-2-8	100 – 12500	91	8	?160x54	0,4
8 GD-1-25	40 – 5000	90 (103)	8	?252x135	5,8
8 GD-1 RRZ	40 – 7000	97 (108)	12	?300x150	5
8 GD-2	80 – 7000	2,8
8 GD-3	63 – 5000	8	?160x80	1,5
10 GD-4	70 – 8000
10 GD-5	50 – 7000	10	?300x140	4,7
10 GD-6	40 – 10000
10 GD-12	40 – 12000	3,4
10 GD-14	40 – 12000
10 GD-17	40 – 8000	94	4,5	?295x140	1,5
10 GD-18	50 – 8000	93 (0.3 Pa)	8	324x212x128	2
10 GD-20	10 GDV-1-8	5000 – 31500	92	8	110x110x44
10 GD-29	50 – 5000	92	4,5	?307x140
10 GD-30	20 GDN-1	40 – 5000	86 (99)	8	?240x112	2,4
10 GD-30B	20 GDN-1-8	63 – 5000	86	8	200x200x97	2,1
10 GD-30E	20 GDN-1-8	63 – 5000	86	8	200x200x97	2,1
10 GD-34	25 GDN-1-4	63 – 5000	84 (98)	4	125x125x75.5	1,3
10 GD-35	6 GDV-6-16	5000 – 25000	91 (98,8)	16	100x100x35	1
10 GD-35	6 GDV-6-25	5000 – 25000	91 (98,8)	25	100x100x35	1
6 GDV-7-16	5000 – 25000	92 (99,8)	16	100x100x39.5	0,95
6 GDV-9-16	5000 – 25000	91 (98,8)	16	100x100x35	1
6 GDV-15-8	90	7
10 GD-35B	10 GDV-2-16	5000 – 25000	92 (102)	16	100x100x35	1
10 GDV-4-16	5000 – 25000	94	16	110x110x70
cell phone	10 GDV-5-8	2000 – 31500	91	8	110x110x35
“Noema”	15 GDV-92-16	3000 – 20000	91	16	?100x36
10 GD-36K	10 GDSh-1-4	63 – 20000	90	4	200x200x87	1,2
10 GD-36E	10 GDSh-2-4	63 – 20000	87,5	4	200x200x87	1,2
10 GDSh-10-4	80 – 20000	89	4	125x125x58	0,9
“Noema”	10 GDSh-63-16	160 – 15000	89	16	160x160x85
15 GDSh-6-8	125 – 12500	89	8	?130x55	0,5
15 GDSh-4-8	8
25 GDSh-1-4	4	125x125
“Itelma”	25 GDSh-1A-4	60 – 20000	88	4	?130
25 GDSh-2M-4	80 – 16000	86	4	125x125x68	1
25 GDSh-2M-8	80 – 16000	86	8	125x125x68	1
“Noema”	25 GDSh-83-4	150 – 20000	87	4	100x100x51	0,6
30 GDSh-74-4	150 – 15000	86	4	?125x58
10 GI-1	2500 – 25000	87 (98,8)	4	107x119x25	0,74
25 GDV-1-4	2000 – 25000	88 (102)	4	107x119x25	0,74
25 GDV-1-8	2000 – 25000	88 (102)	8	107x119x25	0,74
25 GDV-1-16	2000 – 25000	88 (102)	16	107x119x25	0,74
15 GD-10	63 – 12500	92	15	?270x115	1,4
“Noema”	10 GDS-93-4	200 – 15000	86	4	80x80x33	0,86
“Noema”	10 GDS-93-8	200 – 15000	86	8	80x80x33	0,86
15 GD-11	20 GDS-1-4	200 – 5000	89 (102)	4	125x125x77	1,3
15 GD-11	20 GDS-1-8	200 – 5000	89 (102)	8	125x125x77	1,3
20 GDS-1S-8	200 – 5000	89 (102)	8	125x125x77	1,3
15 GD-11B	20 GDS-1L-8	200 – 5000	90	8	125x125x77	1,3
15 GD-11	20 GDS-1-16	200 – 5000	89 (102)	16	125x125x77	1,3
15 GD-11A	20 GDS-3-8	200 – 5000	88,5 (101,5)	8	125x125x73.7	1,2
15 GD-11A	20 GDS-4-8	200 – 5000	89 (102)	8	125x125x73.5	1,3
15 GD-12	40 – 16000	8 + 8	?250x93	1,4
15 GD-13	15 GDN-2-4	100 – 1000	81	4	100x100x65
15 GD-14	25 GDN-3-4	50 – 5000	84 (99)	4	125x125x76	2
15 GD-14	25 GDN-3-8	50 – 5000	84 (99)	8	125x125x76	2
15 GD-17	25 GDN-4-4	40 – 5000	86 (100)	4	160x160x78	1,4
25 GDN-4 KinUp	60 – 5000	95	15	?380?211	8,7
25 GDN-5 KinUp	60 – 5500	97	16	?320?154	4,9
cell phone	25 GDN (cellular)	70 – 6300	87	4	?125?65
15 GD-18	20 GDN-2-4	80 – 3150	81	4	?125x70.7	1,2
30 GDS-3-4	200 – 5000	89 (103,8)	4	125x125x76.7	1,3
30 GD-3-8	200 – 5000	89 (103,8)	8	125x125x76.7	1,3
30 GDS-3-16	200 – 5000	89 (103,8)	16	125x125x76.7	1,3
20 GD-1	20 GDS-2-8	630 – 8000	87,5	8	140x140x100
20 GD-4	20 GDV-1	5000 – 35000	8	125x125
50 GDN-1-8 KinUp	31,5 – 5500	94 (104)	8	?315x180	7,5
25 GD-18-1	HF horn
25 GD-18-22	80 – 10000	95,3	12	?278x142	3,9
25 GD-21	80 – 8000	95,3	12	?278x137	3,9
25 GD-26B	35 GDN-1-4	40 – 5000	84 (99,4)	4	200x200x97	2,1
25 GD-26B	35 GDN-1-8	40 – 5000	84 (99,4)	8	200x200x97	2,1
35 GDN-1M-4	63 – 5000	84	4	125x125x90	2
35 GDN-1S-4	40 – 5000	84	4	200x200x97	2,1
25 GD-32
25 GD-41	50 GDN-3-4	31,5 – 2000	87	4	?250x120	4,75
25 GD-42	50 GDN-3-30	31,5 – 2000	87	4	?250x120	4,75
25 GD-43	25 GDS-1-8	400 – 8000	92	8	?170x50
30 GD-1	30 – 1000	87,5 (105,8)	4/8	?250x125	6
30 GD-2	75 GDN-1-4	31,5 – 1000	86 (104,7)	4	250x250x124	5,5
30 GD-2	75 GDN-1-8	31,5 – 1000	86 (104,7)	8	250x250x124	5,5
30 GD-2A	31,5 – 1000	86	250x250x124	5,5
30 GD-2B	31,5 – 1000	4	250x250x124	5,5
75 GDN-1L-4	31,5 – 1000	85,5	4	?250x150	5
75 GDN-1M-4	31,5 – 1000	85,5	4	250x250x150	5
75 GDN-1M-8	31,5 – 1000	85,5	8	250x250x150	5
75 GDN-3-4	31,5 – 2000	89 (107,7)	4	?250x120	4,9
75 GDN-5-4	31,5 – 1000	85 (103,7)	4	?250x125	4,9
30 GD-6	75 GDN-6-4	31,5 – 1000	88	4	?250x124	5
75 GDN-115	30 – 1000	4
30 GD-11	30 GDS-1-8	500 – 6300	92 (106,8)	8	125x125x70	1,7
30 GDS-1M-8	560 – 6300	91	8	125x125x90	1,7
cell phone	50 GDS	250 – 6300	89	8	125x125x65
cell phone	75 GDS	200 – 6300	92	4
cell phone	75 GDS	200 – 6300	92	8
30 GD-301	63 – 12500	95	12	?315
40 GD-301	63 – 12500	95	12	?315
35 GD-1	50 GDN-1-8	31,5 – 4000	85	8	200x200x100
“Noema”	50 GDSh-64-4 FA	60 – 18000	86	4	160x160x69	0,9
35 GD-2	75 GDN-2	31,5 – 5000	4	?300x120
50 GD-2-25	30 – 1000	4	?315x156	4
50 GD-18-1	HF horn
100 GDN-1-8-55	45 – 4500	95	8	?400
75 GD-1	100 GDN-3-8	25 – 1250	91 (111)	8	?315x190	6,5
100 GDN-6-8	63 – 8000	96	8	?278x120
“Noema”	100 GDSh-33-4	50 – 15000	97	4	?346x139	5
“Noema”	100 GDSh-33-8	50 – 15000	97	8	?346x139	5
“Noema”	100 GDSh-33-16	50 – 15000	97	16	?346x139	5
“Noema”	100 GDSh-47-8	60 – 16000	97	8	?260x124	5
“Noema”	100 GDSh-65-4	60 – 18000	90	4	?178x76	1,8
“Noema”	100 GDSh-65-8	60 – 18000	90	8	?178x76	1,8
150 GDN-1-8	50 – 3150	98	8	?315x130
“Noema”	150 GDSh-35-4	50 – 15000	99	4	?316x132	6,5
“Noema”	150 GDSh-35-8	50 – 15000	99	8	?316x132	6,5
“Noema”	150 GDSh-48-4	60 – 15000	98	4	?260x125	7
“Noema”	150 GDSh-48-8	60 – 15000	98	8	?260x125	7
cell phone	200 GDN	31,5 – 4000	88	8	?250x120
“Noema”	200 GDN-37-8	50 – 6000	98	8	?304x132	7
“Noema”	200 GDN-37-8 (2.0)	50 – 6000	98	8	?304x132	7
"Elaton"	250 GDN/50 GDV
cell phone	300 GDN-1-4	20 – 3150	90	4	?315x130
300 GDN-1-8	20 – 3150	90	8	?315x130
VGD-1	800 – 18000	3 bar	5	?105
VEFPER-1	2,1
DAG-1	2

Table from here >>>

Speaker 35GDN-1 (25GD-26B)

35GDN-1 (25GD-26B) - loudspeaker head of electrodynamic type, low-frequency, round, with an unshielded magnetic circuit.

Warranty period: 2.0 years. Technical specifications: IS 3.843.068 TU

Designed for use in acoustic systems of the highest and first complexity groups as a low-frequency link in rooms. The diffuser holder is made by injection molding from aluminum alloy.

The magnetic circuit contains the following elements:

— Ring ferrite magnet brand M28PA180 size K110x45x16 mm; — Core with a diameter of 39.82 mm; — Top flange with a hole with a diameter of 42.75 mm. Air gap height 7 mm; radial width of the air gap is 1.46 mm, induction in the gap is 0.95 T.

Refinement of dynamic heads 3GD-31. New look 30 years later

I’ll answer by telegraph, but to everyone: blush: I was tinkering: a) out of sporting interest, b) to help those who have speakers with these speakers. c) specialists (I’m an amateur) do it, but silently, on the sly...

al Ex Thank you! Regarding filters, you have to write a lot. In short, you need to set it up with a microphone, then be sure (!!) to listen because a more even frequency response does not always sound better (my incompetent opinion).

AudioKiller - Impregnation mainly with guerlain and NC varnish. They seem to be durable, regarding temperature, humidity and other things - this is cheap paper without any pretensions to the Hi-End. — I haven’t heard the advantages of padding polyester over guerlain, but I’m not a listener and I don’t insist. It's easier with guerlain. — The quality factor of 0.7 turned out to be an accident. I was happy with the order, I didn’t do any adjustments, I think yes, 1…2 would be better, but this is not a woofer and the tweeter will not work at the resonance frequency. — I might have found a recipe if I had been given a bucket of speakers (and even then, I wouldn’t have pleased everyone).

Nevod Yes, I want to do it, I have nothing to grind a 12 mm cylinder with. I hope so myself. 3GDSH-2 (2GD-40) and similar ones require some modification, but they sound good, I agree (without any claims to the Hiend).

pavel_k Measurements are never accurate (just as no two speakers are identical) Replacing with a 10GD-35 will probably require adjusting the filters and replacement is another story.

meshin - drilling a basket with a step drill is quick and convenient (how simple drilling can be, the magnet must be wrapped in foam rubber to collect sawdust on it, etc.) - I’m personally interested in the work of MF + HF on a shield! — the box is not needed, the box for the ZY can be found in household goods or made from cardboard, maybe it is not needed at all because the thick synthetic padding dampens a lot, — taking a magnet from another speaker (you have to buy it in order to throw it away) is not for me, — moving it coil from another speaker, adapting it, etc. - it’s difficult for me, I have no experience, I won’t undertake it, I try to make it as simple as possible - 5 pairs have been redone, but not a single article, there are not only measurements, but even a subjective assessment, that’s all is done in deep secrecy, which is a pity, I would study it with great interest - we are waiting for publications on these speakers and others available, preferably accessible for repetition by ordinary users.

partizan0018 Yes, faith in what is written somewhere and by someone is very great. Everyone has different quality criteria and different tastes, so any options are not suitable for everyone, but for a certain circle. Label mania and dysignomania are strong - it puts a lot of pressure on the psyche. I am gradually coming to the conclusion that you can get decent sound from inexpensive speakers (I repeat - not hi-end ones), I have expensive speakers, but their sound does not cause much delight - everything is very clean, but not very interesting.

I think not all ovals are bad, this factor is not in the first place. The same 3GD-32 oval, but it sounds very good.