D'Appolito isobarico

[Stee]

Modern loudspeaker configuration is an internal Push-Pull 😕

natural sound comes from complementary copules
two drivers are mounting inside an isobaric volume
and connected in reversal polarity 😎

the other bottom volume (about 2X Vas) is closed

in my case four Morel MW166 plus tweeter Vifa XT25 for each channel

Happy New Year

 

[bjorno]

Hi,

What type of modern XO are you using? What are the XO frequencies, the m-t-m c-c distance and are measurements available?

See the picture where I tested some 12 dB filters:

b

Picture 1(1)

 

[planet10]

I built a couple pairs of MTM isobariks back in the early 80s (KEF T27+B200x4 and T27+B110x4). They both suffered from the predicted suckout of an isobarik operating into the midrange. The upside was a very distinct removal of box signature from the sound.

dave

 

[Stee]

Hi

I built A LOT of couple pairs of MTM isobariks back in the 90s
now i have found the secret:

it's very important have distance between external/internal wfrs
inside isobaric room
that create a tuning in different tone ( do - mi - la )

distance m - t - m is 150mm (axis to axis)
so totally 300mm m - m

at the moment just twt is filtered
😱