I have been building DIY speakers for many years and wanted to combine the benefits from some good (old) French designs, like Elipson and Jean-Marie Reynaud with improved housing, materials and speaker units. The idea was to have as less material possible around the drivers to avoid baffle diffraction and off set the drivers for time alignment which has a profound influence to get a coherent wave front. I opted for a closed enclosure because of the huge impact this has on the low midrange performance and a more tight, time correct bass.
The listing position meant that the bass enclosure could not be more then 80 cm high and the total height not more then 110 cm. Other important point was as less filter components as possible so the unit's needed to be able to handle 6 dB filtering, except for the magnetostat tweeter which has a 18 dB slope for protection and low distortion. The Dynaudo D54 54 mm dome is designed to handle 6 dB filtering and the Vifa 8 inch woofer has a flat curve and easy reproduces 1 Khz and forms a great match with the dome midrange. The dome midrange has a natural fall off at about 6 KHz. There is no coil for the high cut off because of this natural fall off. The magnetostat tweeter on the other hand has a 18 dB filter because these small diaphragms do not like big amplitudes of movement.
The driver lay out is more like a 2+ way because the woofer and dome midrange cover 30 - 6000 Hz together. This means in practice that bass and midrange do the most important part of the music and the tweeter does only the really high frequency's. The dome midrange is the core driver of this design because it's wide dispersion in the room gives the sound a natural character, even if you are outside the room. This specific character of dome midranges you hear very well when voices and saxophone is reproduced. It has this natural dispersion of sound in a room like a voice or instrument has.
Other objective was to avoid resonance and standing waves in the enclosure and the use of "dead" material without much ringing. The MDF baffle is covered in the inside with ceramic tiles (glued) to avoid sound leaving the enclosure. It is forming a acoustic barrier because of the two very different resonance frequency's of MDF and ceramic. The bass unit needed to be able to play up to 1 KHz and be able to reproduce the low-mid frequency's (voices ect.) with clarity and low distortion. This means a light (23 gram) non resonant poly cone with good damping like this filled poly cone from the Vifa 21WP250, which by the way play's very low in this 40 Liter enclosure.
I build a TL line subwoofer to add the low frequencies from 25 - 40 Hz with a 12 dB cut of at 40 Hz. The sub has a line of 3.2 meters and is 220 cm long.
Wanted to share the pleasure of building and listening..
Silencio design and build
The listing position meant that the bass enclosure could not be more then 80 cm high and the total height not more then 110 cm. Other important point was as less filter components as possible so the unit's needed to be able to handle 6 dB filtering, except for the magnetostat tweeter which has a 18 dB slope for protection and low distortion. The Dynaudo D54 54 mm dome is designed to handle 6 dB filtering and the Vifa 8 inch woofer has a flat curve and easy reproduces 1 Khz and forms a great match with the dome midrange. The dome midrange has a natural fall off at about 6 KHz. There is no coil for the high cut off because of this natural fall off. The magnetostat tweeter on the other hand has a 18 dB filter because these small diaphragms do not like big amplitudes of movement.
The driver lay out is more like a 2+ way because the woofer and dome midrange cover 30 - 6000 Hz together. This means in practice that bass and midrange do the most important part of the music and the tweeter does only the really high frequency's. The dome midrange is the core driver of this design because it's wide dispersion in the room gives the sound a natural character, even if you are outside the room. This specific character of dome midranges you hear very well when voices and saxophone is reproduced. It has this natural dispersion of sound in a room like a voice or instrument has.
Other objective was to avoid resonance and standing waves in the enclosure and the use of "dead" material without much ringing. The MDF baffle is covered in the inside with ceramic tiles (glued) to avoid sound leaving the enclosure. It is forming a acoustic barrier because of the two very different resonance frequency's of MDF and ceramic. The bass unit needed to be able to play up to 1 KHz and be able to reproduce the low-mid frequency's (voices ect.) with clarity and low distortion. This means a light (23 gram) non resonant poly cone with good damping like this filled poly cone from the Vifa 21WP250, which by the way play's very low in this 40 Liter enclosure.
I build a TL line subwoofer to add the low frequencies from 25 - 40 Hz with a 12 dB cut of at 40 Hz. The sub has a line of 3.2 meters and is 220 cm long.
Wanted to share the pleasure of building and listening..
Silencio design and build
Attachments
Last edited:
