DIY speakers with Monacor speakers

Bass-reflex tube choice for Monacor speakers


With Monacor tubes, based on a QL / 7 loss factor and a 0.6 ohm series resistance.

One to three cabinet variants are given.


Speaker Net volume Frequency set Lower limit frequency -3 dB Tube lenght Quantity of tube Type of tube
Litre Hz Hz mm
60/90 49/44 50/43 25/18 3
110/150 37/38 45/39 32/19 4
4/7 63/57 64/52 15/10 1
20/35 68/60 74/59 13/7 1
SP-12/100PA 60/100 51.2/48.6 56/45 10/4 1
SP-12A/300NEO 25 80 82 7 2
55/75 55/53 56/50 22/15 2
60/120 57.7/52.2 68/52 17/6 2
SP-15A/350NEO 50 70 74 12 2
125/150 43/42 46/43 23/18 3
SP-215 40/60 34/30.9 41/35 21/16 2
35/60 48.5/37 45/44 18/18 2
SP-25A/250PA 12/25 78/60 79/59 22/17 2
80/125 40/43 53.7/42 14/4 1
80/120 42/36.8 50/42 12/10 1
SP-305PA 100/150 42/36.7 42/35 8/6 1
SP-30A/200PRO 40/65 60/55 68/55 12/6 1
SP-30A/250PA 25/40 70/65 79/66 15/9 1
SP-30A/300NEO 25/40 70/65 79/66 15/9 1
70/130 63/50 66.5/53.7 8/6 2
SP-380P 80/120 44/39 51/43 22/17 2
150 32.7 40 21 2
SP-385G 150 35.8 42 18 2
SP-38A/300NEO 70/130 63/50 66.5/53.7 8/6 2
SP-38A/300PA 50/80 53/45 54/45 29/23 2
SP-38A/300PRO 50/80/120 65/50/55 74/62/52 15/17/5 2
100/130 45/44 46/52 16/11 2
110/150 40/42 48.5/43 20/10 2
180/250 33/35 40/34 28/14 3
SP-46A/500PA 75/120 47/46 57/47 23/10 2
10/15 60/57 67/57 13/8 1
8/15 53.4/50.4 54/44 10/5 1
SPA-30PA 80/100 45/42 43/39 10/8 1
SPA-38PA 150/250 35/35 42/34 20/7 2
SPA-45PA 250/350 30/30 35/30 24/14 3
5/8/10 58.7/48/42.9 54/44/39 14/13/10 1
5/8 67.4/61.3 66/56 10/7 1
8/15 62.1/45.3 61/45 16/16 1
AL 6/12 56/50 61/47 13/7 1
/AD 10/20 55.5/44 58/43 16/12 1
10/20 52.8/38.3 50/37 18/17 1
8/15 62.2/50.8 61/48 16/12 1
15/25 43.2/36 40/33 18/15 1
10/15 70/57.2 66/54 16/16 1
15/30 51.3/37 45/33 21/20 1
18/30 51/35 46/33 17/19 1
15/30 54/.6/36.3 50/34 18/15 1
30/50 36.8/34.8 40/32 18/12 1
10/15 55/48 56/48 24/20 3
20/40 453/32 41/29 20/20 1
18/35 48.8/35.7 50/37 19/18 1
25/32 40/34 40/36 14/17.5 1
18/35 51.5/38.7 50/37 20/18 2
30/50 40/31 37/29 20/20 2
20/30 49.1/40 47/39 20/20 2
20/35 49.1/44.9 52/43 20/12 2
SPH-212 40/80 34/33.8 39/31 21/8 21
15/22 48/42 48/41 24.5/22 2
35/60 45/34.3 47/37 22/22 2
100/150 27.6/23.4 30/25 20/18 2
30/60 45/37 51/41 22/18 2
35/55 45/36.5 50/41 22/21 2
SPH-265 55/100 36/.5/27.1 37/28 21/21 1
SPH-275C 50/75 39/36 40/35 16/11 1
40/70 43.4/39.4 45/40 22/18 1
75/110 34.3/28.3 36/31 24/24 1
40/70 47/40.9 56/45 24/17 3
50/80 44.2/35.5 50/41 23/22 2
100/130 28/27 33/29 28.5/25 2
100/200 40/28.3 44/33 24/24 2
121/170 30/28 36/31 28/17 1
SPH-75/4 3/5 84/65 75/59 11/11 1
4/8 70/64.5 61/54 12/6 1
/ 4/8 70/58.1 72/55 12/8 1
SPP-135S 8/15 57.8/47.8 58/45 19/14 1
SPP-165S 20/30 45.5/38.5 46/38 11/10 1
SPP-225 20/30 50.1/44.7 53/45 19/15 2
SPP-300/AD 60/100 39/34.3 46/38 23/16 1
SPW-150/8S 10/18 44/44 48/38 24.5/13 1
80/120 52/50 50/44 15/7 2
150/250 45/40 44/36 8/3 2
85/110 49/50 58/51 17/9 2


Recommendations on Monacor speakers


Be careful : For optimum sound reproduction and effective protection of the components used, it is essential to call on a specialist.
All the filters listed in this table are basic models. An attenuation or modification of the filter can make it possible to optimize the sound results. Sometimes some filters are completely redesigned (E-FW references).
You will find in the catalog Monacor speaker kits ideas for complete speaker construction.


Speakers Max power Volume Load type Recommended crossover Notes
Watts Litre Bass-reflex (BR) or Closed (CL) Crossover model or Capacitor(s) alone (C, C1, C2...)
2 x DT-75/4 ou DT-74/4 100 20 BR C = 2 x in serie !
DT-75/8 ou 60 10 BR C = / DN-1 / DN-6ST  
DT-106 60 25 CL DN-6ST / /  
200 100 BR DN-300 midrange in a separated volume, closed 10 litres
SP-380P 200 150 BR in a separated volume, closed 5 litres
SP-380P MHD-120 200 150 BR C1 = / C2 =  
250 75 BR Allround speaker with special contant level
SP-80X ou 70 55 CL / DN-2 / DN-6ST  
4 x ou 8 x 200 40 CL Direct without crossover  
ou 70 35 CL / DN-6ST  
DT-25TI 60 5 BR C = / DN-6ST Excellent 2-way system
80 10 BR ou Excellent 2-way system
DT-119 ou DT-25TI 80 15 BR ou Excellent 2-way system
DT-105 ou DT-106 100 10 BR ou Active speaker or HF, 2-way system
100 15 CL ou Excellent 2-way system
DT-105 ou DT-106 ou 100 25 BR ou 2-way active system
ou 120 50 BR ou Excellent 2-way system
SPH-212 DM-510 ou 120 60 BR Excellent 3-way system
DM-135 DT-106 120 65 BR  
SPH-265 ou 250 50 CL DN-300 or separated crossover comme excellent médium dans un volume séparé de 3 Litres, i.e. Monacor SPC-300
DM-135 DT-106 ou 200 80 BR  
200 80 CL DN-300 dans un volume séparé
DT-119 ou DT-105 120 15 BR Special crossover with double band-pass Excellent 2.5-way system
DT-119 120 25 BR Special crossover with double band-pass Excellent 2.5-way system
MS-130 ou DM-135 DT-119 300 35 BR Special crossover with double band-pass Excellent 3.5-way system, MSH-130 in separated volume, i.e. Monacor SPC-300
DM-510 500 65 BR Special crossover with double band-pass Excellent 3-way system
ou 500 (2 x 250) 65 BR 2 x Hifi stereo subwoofer / car audio
600 (2 x 300) 160 CL 2 x ou 2 x Hifi stereo subwoofer
DT-106 ou ou DT-119 60 10 BR C = ou DN-20 Small 2-way system
DT-75/4 ou DT-74/4 60 10 BR C =  
75 60 CL / DN-5BC Also as acoustic line
SPP-300 90 120 CL / DN-5BC Also as acoustic line
SPP-300/AD DM-135 DT-106 ou 250 65-85 BR Classic 3-way system
SPP-300/AD 250 65 CL DN-300 or special crossoverl in separated volume between 3L and 5L
ou 200 75-120 BR DN-300 Excellent 3-way system, in separated volume, i.e. Monacor SPC-300
150 25-40 CL DN-300 Excellent 3-way system, in separated volume
120 50 BR ou filtre spécial Excellent 2-way system
ou DT-25TI 80 35 BR ou filtre spécial Excellent 2-way system
100 20 BR ou filtre spécial Compoact 3-way system, in separated volume, i.e. Monacor SPC-300
ou DT-25TI 100 15 CL DN-1218 ou filtre spécial Excellent 2-way system
DT-25TI 50 8 CL C = ou DN-6ST Small 2-way system
SPH-275C 250 75 BR DN-300 Top hifi speaker, SPH-135 in closed chamber about 10L
120 50 BR High power hifi speaker
100 10 BR Filtre selon schéma kit "MIRROR" High End bookshelf speaker
SP-38A/300PA SP-25A/250PAM 800 100 BR + Top PA speaker, 15L closed midrange
MRH-140 600 80 BR DN-2618P PA power speaker
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