Nicknamed INNER LIGHT
Open baffle alnico speakers.
MY CURRENT REFERENCE
THE ULTIMATE NIRVANA OF SPEAKERS
After all these years I finally found the way to make good sound.
Open baffle. ONLY OPEN BAFFLE
Getting rid of the boxes and all trouble associated with their
construction - the volume, stiff walls, bracing, tuning, shaping,
damping, etc. - HOW SIMPLE LIFE CAN BE!!!
I am sorry but compared to these speakers, everything I ever built before does not compare.
At the same time I found best speaker drivers - alnico. Antique speakers from old radios from 1950's.
I used SABA GREEN but there are tens of models like telefunken, philips, grundig, isophon, siemens, and many more.
The tweeter, 10 cm paper SABA alnico magnet unit - has one of the best treble I had
at home. Unbelievable considering its age, price and specs.
I mount the drivers on piece of wood just to hang them at the right height.
I used a solid oak plank supported by a concrete slab.
These speakers use special magnets not available any longer. Thanks to
these magnets the speakers have above 100 dB/Watt sensitivity. They
play very loudly from 1 watt.
The bass (3 way config) is mounted in the bookshelf. This is the
acceptable compromise of "infinite baffle" size - quite finite in fact but
adequate - 2,5 m tall by 120 cm wide. The shelf back
plane gives baffle separation from back wave of the bass drivers
to avoid cancellations. The cancellation only occurs off-axis and that
gives the fantastic effet of NOT exciting the room. The
perpendicular shelves stiffen the back boards. The books serve as
weights, vibration dampers and - which is important - diffusers for midrange back wave.
The drivers are mounted from the back side and the wood is routed round at the opening.
You can see the bass unit in its position. The open baffle arrangements
produces sound totally free of boooom, resonance, overhang, etc. It is
very clean, precise, easy to locate in the dead center of stage.
Conventional box bass sounds terribly, broken by comparison.
The bookshelf back board has been reinforced by plywood..
Some experimental XO
JBL 18 inch bass competing with two 15 inch Alphard Chinese generics.
Chinese generics competing with UK legend - ATC in 15 inch category.
And the winner is ...15 inch Altec Lansing from USA (1970's ?)
Not Alnico but nevertheless great bass drivers with 98 dB/W sensitivity.
In my experience the best bass, head and shoulders above every other driver.
question: If money was no object and you would have 50 000 Euro to
spend on the system, what would you have: The answer would still be : "P12
speakers and lampized Grundig 9009". Money do not change anything in
this respect. I would spend the rest of the money on Audionote Kondo
amplifier from Japan.
XO- Click to enlarge