Eltax Liberty 5+ modification
Posted 10th February 2015 at 09:22 PM by Maciej Czerwinski
I bought these speakers in 2000. I was unhappy with the way they reproduce low frequencies. I decided to add a subwoofer. I used the fact that the lower part of the housing of the speaker is empty and isolated from the upper part in which the speakers operate. I cut a hole in the side of the bottom part and installed a 25 cm driver.
![Click image for larger version
Name: dziura.jpg
Views: 337
Size: 18.0 KB
ID: 1551](attachments/1551d1423599306t-eltax-liberty-5-modification-dziura.jpg)
It is Vestra PW-250-2154 woofer.It has a 19 cm coated-paper membrane, foam external suspension, extruded metal sheet basket, ventilated 4.5 cm coil, the diameter of the magnet is 12 cm, 80 W, 4 ohms, the self-resonance (Fs) at 27 Hz.
![Click image for larger version
Name: glosnik2.jpg
Views: 461
Size: 18.2 KB
ID: 1552](attachments/1552d1423599306t-eltax-liberty-5-modification-glosnik2.jpg)
I damped the interior of this newly created enclosure space with bitumen mat and felt glued to the walls and filled it with fleece. I cut out the rear wall from the top part of the enclosure. Inserted a reinforcing crossbars into the lower and upper housing. The upper part of the housing is entirely filled with a damping material (with fleece filled pillow, which has been removed for a photo).
![Click image for larger version
Name: tyl.jpg
Views: 2445
Size: 65.8 KB
ID: 1554](attachments/1554d1423599306t-eltax-liberty-5-modification-tyl.jpg)
Removal of the rear wall let me get rid of some resonances. I also designed and made new crossover.
![Click image for larger version
Name: zwrotn_schem.png
Views: 332
Size: 4.9 KB
ID: 1559](attachments/1559d1423599306t-eltax-liberty-5-modification-zwrotn_schem.png)
Mid and high frequency section is placed in a wooden housing:
![Click image for larger version
Name: zwrot1.jpg
Views: 352
Size: 112.3 KB
ID: 1556](attachments/1556d1423599306t-eltax-liberty-5-modification-zwrot1.jpg)
![Click image for larger version
Name: zwrot2.jpg
Views: 854
Size: 93.0 KB
ID: 1557](attachments/1557d1423599306t-eltax-liberty-5-modification-zwrot2.jpg)
Low frequency section is mounted inside the bottom part of the enclosure:
![Click image for larger version
Name: zwrotn_bas.jpg
Views: 314
Size: 96.9 KB
ID: 1558](attachments/1558d1423599306t-eltax-liberty-5-modification-zwrotn_bas.jpg)
The original one was a very low-budget design and totally useless with this new setup:
![Click image for larger version
Name: stara_zwrotn.jpg
Views: 257
Size: 23.5 KB
ID: 1555](attachments/1555d1423599306t-eltax-liberty-5-modification-stara_zwrotn.jpg)
Now the original Eltax low-midrange speaker acts only as a midrange speaker.
![Click image for larger version
Name: przod.jpg
Views: 1920
Size: 61.2 KB
ID: 1553](attachments/1553d1423599306t-eltax-liberty-5-modification-przod.jpg)
![Click image for larger version
Name: dziura.jpg
Views: 337
Size: 18.0 KB
ID: 1551](attachments/1551d1423599306t-eltax-liberty-5-modification-dziura.jpg)
It is Vestra PW-250-2154 woofer.It has a 19 cm coated-paper membrane, foam external suspension, extruded metal sheet basket, ventilated 4.5 cm coil, the diameter of the magnet is 12 cm, 80 W, 4 ohms, the self-resonance (Fs) at 27 Hz.
![Click image for larger version
Name: glosnik2.jpg
Views: 461
Size: 18.2 KB
ID: 1552](attachments/1552d1423599306t-eltax-liberty-5-modification-glosnik2.jpg)
I damped the interior of this newly created enclosure space with bitumen mat and felt glued to the walls and filled it with fleece. I cut out the rear wall from the top part of the enclosure. Inserted a reinforcing crossbars into the lower and upper housing. The upper part of the housing is entirely filled with a damping material (with fleece filled pillow, which has been removed for a photo).
![Click image for larger version
Name: tyl.jpg
Views: 2445
Size: 65.8 KB
ID: 1554](attachments/1554d1423599306t-eltax-liberty-5-modification-tyl.jpg)
Removal of the rear wall let me get rid of some resonances. I also designed and made new crossover.
![Click image for larger version
Name: zwrotn_schem.png
Views: 332
Size: 4.9 KB
ID: 1559](attachments/1559d1423599306t-eltax-liberty-5-modification-zwrotn_schem.png)
Mid and high frequency section is placed in a wooden housing:
![Click image for larger version
Name: zwrot1.jpg
Views: 352
Size: 112.3 KB
ID: 1556](attachments/1556d1423599306t-eltax-liberty-5-modification-zwrot1.jpg)
![Click image for larger version
Name: zwrot2.jpg
Views: 854
Size: 93.0 KB
ID: 1557](attachments/1557d1423599306t-eltax-liberty-5-modification-zwrot2.jpg)
Low frequency section is mounted inside the bottom part of the enclosure:
![Click image for larger version
Name: zwrotn_bas.jpg
Views: 314
Size: 96.9 KB
ID: 1558](attachments/1558d1423599306t-eltax-liberty-5-modification-zwrotn_bas.jpg)
The original one was a very low-budget design and totally useless with this new setup:
![Click image for larger version
Name: stara_zwrotn.jpg
Views: 257
Size: 23.5 KB
ID: 1555](attachments/1555d1423599306t-eltax-liberty-5-modification-stara_zwrotn.jpg)
Now the original Eltax low-midrange speaker acts only as a midrange speaker.
![Click image for larger version
Name: przod.jpg
Views: 1920
Size: 61.2 KB
ID: 1553](attachments/1553d1423599306t-eltax-liberty-5-modification-przod.jpg)
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