Translator Stylus One crossover upgrade

The Translator Stylus One from 1988 has a great overall closed cabinet speaker design with nice good quality Scan Speak drivers. 

The upgrade that we describe here will cost you some money but it will be really worth it and upgrades your Stylus one with a modern and up-to-date crossover which performs a lot better than the original crossover.

One of the nice original wood veneer designs supplied by the manufacturer.

A heavy almost 30Kg MDF wood veneer cabinet nicely buit with sufficient bracing on the inside. With double layer MDF panels baffle.

It incorporates the absolutely fantastic Scan Speak drivers from the Classic line, Woofer 21W/8551, Midrange 13M/8621 and tweeter D2010/8513.

So all excellent stuf so far but wait until you discover the horrible crossover the manufacturer supplied it with.

The original crossover installed by the manufacturer.

As always it is unbelievable that an expensive unit is equipped with a crossover like this. Very crappy and inexpensive parts, maybe €15.00 total cost, that you would expect in a cheap loudspeaker system but not in a Translator. Cheap ceramic resistors and those capacitors, where did they find them…

Obviously not the best electronics designers from that era, no imagination and creativity, well creative it is somehow but in the wrong way.

And the glue they have used, why ?! 

In some of the images you can see that there are actually 63V DC capacitors, 35V AC, in the circuit.

So we need to upgrade this to a level that should have been there in the first place.

The schematic of then original crossover.

Nothing wrong with the approach, the idea for the crossover is a basic but actually nice filter design. 

A 12dB per octave lowpass for the woofer, 6dB for the midrange and 6dB with phase correction for the tweeter. Driver attenuation resistor networks for both midrange and tweeter are also applied.

An impedance correction network for the woofer would have been nice however we will stick with the original design in our new crossover setup.

Parts for a new set of crossover filters for the unit.

For all capacitors in the signal path we selected Jantzen Superior Z-caps. These caps have very little coloring and offer an extremely transparent sound reproduction. The other caps are Standard Z-caps and Cross caps also from Jantzen.

Coils in the signal path are Jantzen 16AWG WAX coils. A very stable top of the line inductor with very low DC resistance that is impregnated with a special paraffin wax. 

Resistors chosen are 10W metal oxide resistors that are impedance free with plenty of stable powerhandling for this crossover.

To hard-wire the parts a standard 2.5 mm copper wire is used.

Prepared plywood panel for mounting parts.

A 12mm thick plywood panel 290 x 180 mm can hold all parts nicely and will fit through the woofer cutout.

Solder tags are mounted to support the smaller parts for easy soldering. 

For mounting of the WAX coils M5 threaded inserts are screwed in to the panel. This ensures a rigid mounting pont and a flat surface on the rear of the panel. 

The coils are mounted with a couple of M5 x 35 bolds and washers with a thin foam tape on the back of the coils to fix them in place. Make sure this is a thin foam otherwise you can destroy the coils when mounting.

Newly constructed crossover.

A 12mm thick plywood panel 290 x 180 mm can hold all parts nicely.

The larger capacitors are glued in place with a two component glue.

The newly constructed crossover placed in the cabinet.

The plywood panel will fit trough the hole of the woofer and is mounted to the side of the cabinet using screws.  

Apply some foam sealing tape to the bottom of the panel to prevent vibration before you screw it in.

A complete rewire of the cabinet for the drivers with 2.5mm thick pure copper wires.

The kit can be found in our webshop here.

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