Loudspeaker Designs and Articles for the DIY Enthusiast
Invictus: (adj.) Incapable of being conquered, overcome, or subdued. Invincible.
Synonyms: unbeatable, unconquerable,  invulnerable, unshakable, indomitable,
impregnable, unassailable, insuperable, indestructible, supreme, insurmountable,
Woofer topology

The woofer uses a very
simple 2 element
topology. The transfer
function is 2nd order
acoustic and a Q
suggesting a Bessel
alignment. This use of
an underlapped
crossover with the
tweeter provides a
reasonably flat
Tweeter topology

The tweeter utilizes a 5
element topology. The 3rd
order electrical filter
transfer function provides
a 6th order acoustic with
the Q again suggesting a
Bessel alignment. The
tweeter is connected with
normal polarity due to the
differences in acoustic
centers and
non-symmetrical transfer
Crossover Design:
Crossover overview:

In keeping with my desire for simple crossover topographies and minimal parts counts, the Invictus has a total of 7 crossover components. As always I let
the drivers themselves choose the crossover points and topologies they wanted. -It seems only fair they get a choice. This resulted in a mixed order
crossover and a rather high order transfer function for the tweeter. Both drivers appeared to be in a Bessel mood... The f6 of both transfer functions are at
about 2200 Hz. Inverting the tweeter phase provides a wide deep cancellation of approximately 28 dB, and indicates excellent phase tracking in the driver
stop bands. The use of Bessel filters suggest the qroup delay will be well behaved.
Links to:

Main / Design Goals

Driver Selection

Sealed tower Cabinet construction
Sealed Bookshelf cabinet construction
MLTL Cabinet Construction

Crossover Design

More Measurements

Listening Impressions
A two way design using
top shelf drivers
3 different enclosure variations
Click this picture to purchase the complete kit featuring Sonic Caps and Lynk MOS resistors available from Meniscus Audio Group