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.
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.
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).
Removal of the rear wall let me get rid of some resonances. I also designed and made new crossover.
Mid and high frequency section is placed in a wooden housing:
Low frequency section is mounted inside the bottom part of the enclosure:
The original one was a very low-budget design and totally useless with this new setup:
Now the original Eltax low-midrange speaker acts only as a midrange speaker.
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.
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).
Removal of the rear wall let me get rid of some resonances. I also designed and made new crossover.
Mid and high frequency section is placed in a wooden housing:
Low frequency section is mounted inside the bottom part of the enclosure:
The original one was a very low-budget design and totally useless with this new setup:
Now the original Eltax low-midrange speaker acts only as a midrange speaker.
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