TOY PASSIVE

SEAS Excel TOY, 2 Way Loudspeaker Kit using C16NX001/X, Passive version.

A High-Performance loudspeaker kit featuring the SEAS Metamodal™ TPCD coax C16NX001/X.

This compact loudspeaker kit excels both in stereo and surround sound setups with its point source dispersion, balanced sound and versatile placement. You can choose between making it with a passive crossover or a dsp.

Drive unit
The coaxial driver is SEAS C16NX001/X - E0121-04/06 feauturing Metamodal™ TPCD diaphragm for both the tweeter and woofer. This has low weight, high stiffness and controlled damping ensuring an unparalleled sound quality. Combined with an FEA optimised magnet system and a Titanium voice coil former this compact driver can really deliver a dynamic, clean and detailed sound.

Enclosure
We wanted to make a compact speaker, so we chose to use a closed box design. The internal volume is 5,7L resulting in a Qbox of 0.59. This give the driver a good balance between low end extension, transient response and a flat SPL. The enclosure is filled 70% with a polyester foam damping material without compacting it. Most distributors have a version of this and they come with many different brand names: Acousto-Q, Acoustilux, Acousta-Stuf and so on.

The Crossover
We chose to build both an active and passive crossover to let everyone choose their preferred setup. In this kit we used a miniDSP 2x4HD to do the dsp task, but it could also be implemented on most other dsp platforms.

With the crossover we aimed for a balance between a smooth and slightly falling response in the listening window and a smooth power response while keeping a good phase tracking between the drivers. The listening window is here defined as the average response within 0-30 degree off-axis.

The passive filter uses a 3rd order electrical high-pass for the tweeter, and a 2nd order low pass with a correction filter for the woofer. The resulting crossover point is 2kHz. All capacitors are metalized polypropylene foil and the coils are air-core coils, except for the 1.2mH coil which uses an iron core. The resistor is 10W MOX.

On the active filter, we have used a selection of parametric EQ's, Pole shift, high and low pass filter, shelving filter and an all-pass. The all-pass filter is used to get the two drivers in phase over a large frequency range for a seamless crossover between them. The crossover point is also here set at 2kHz.

The schematics for the crossovers are shown in the below graphs. The setup file for the miniDSP is available as a download on the top of the page. This also includes the measurements of the drivers in the box and the VituixCAD file for simulating the crossovers. This can be used to explore other ways of tuning the dsp or passive crossover.

Active:

Passive:

!!! ENCLOSURES NOT INCLUDED !!!