RCF TTL31-A, Owner'S Manual

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5
THE TTL31-A 8” NEO WOOFERS
The MB8N252 is a high output, high power handling mid-bass
designed to provide a very tight and fast response in hybrid reflex-
hornloading designs. Extended response down to 60 Hz, inside-
outside voice coil, M-roll surround. The voice coil size is 2.5”.
The TTL31-A is equipped with 1 MB8N252 in a
hybrid reflex-hornloaded bandpass configuration:
THE TTL33-A 8” NEO MIDRANGE
The MR8N251 is a high efficiency, low distortion midrange specially
designed to provide superior sound pressure level in a very compact size.
The total weight is reduced to less than half of a comparable ceramic
midrange thanks to an incredibly powerful neodymium magnet assembly.
Every detail of this speaker has been optimised to offer maximum linearity
and perfect control to the midrange and midhigh frequencies. The voice coil
size is 2.5”.
In the TTL33-A application, the MR8N251 is frontally horn loaded
and equipped with a lightweight aluminum back-can.
THE TTL33-A/ TTL31-A 1” NEO COMPRESSION DRIVER
The ND1411-MT compression driver is a design conceived for array
applications: very high output, high power handling, the overall size
is very small for the minimum spacing. Neodymium magnet, titanium
dome, mylar surround, radial phase plug. The voice coil size is 36 mm.
The TTL33-A /TTL31-A is equipped with 3 ND1411-MT in horn-loaded
configuration.
HIGH FREQUENCY HORN
The high frequency horn is one of the key parts of the line array.
One of the biggest problems in line array designs is the difference in
path lengths from driver to driver in high frequencies; this is cause of
hf comb filtering and cancellation. To avoid this problem many array
designs present in front of the driver complex “acoustic chambers”
to equalise different paths ( sound chambers, reflective chambers,
waweguides,…). Those devices are usually creating impulse response
problems and acoustic loads that are changing with the frequency.
In the TTL33-A/TTL31-A horn design, thanks to the very small overall
diameter of the drivers, the spacing between ND1411-MT centres of
emission in the array application is only 70 mm. Thanks to this small
spacing it has been possible to equalise the different paths with a simple
straight horn, with a very simple design that avoids reflections. The result
is a very even frequency response, a coherent wave source, a very natural
and transparent sound.
The TTL33-A/TTL31-A high frequency horn is designed to create a
continuous and coherent line from cabinet to cabinet.