Minggu, 22 Agustus 2010

Rejuvenating Spica TC50

I'm currently listening to my Spica and also waiting for my fastening break time, why not continue the Spica story?. This legend is known for its 'disappearing' and staging quality. When you listen to it soon you'll  forgot that there are speakers in front of you. Just sounds floating around and in front of you. That's the way I liked it just like my more refined Magnepan SMGa.

My Spica : pre 1988 built !

One box sounds not so loud as the other. So I starts measuring both with my DIY Speaker Workshop Jig II, here is the result, yes the "B' channel just sounds softer.

Now it's confirmed I planned to move the internal crossover to outside the box for better tweaking and checking. I opened both boxes & smells 22 years old odors of this spica. All drivers were in unbelievable good condition, original French Audax including hand markings for each driver to match the crossover. Not to forget, thick genuine sheep wool blankets

So lets see the crossover, as said in the forums, electrolyte capacitors , those yellow things says ECI on the marking. Hell of electrolytes, after more than 20 years !. Inductors are cheap ones with ferrite cores both for high & low frequencies. Resistors are good metal oxyde though.

One elco is not in good condition, white thing comes out so must be leaking then. Here is my old story about electrolytes in loud speaker. Not bad, one out of 10 elco after 20 years!. I just replaced it temporarily with cheap MKP until I have the mood for tweaking.

Leaking capacitor
Now it's the turn of the enclosures - a closed box with no leaks. I have to make sure of no leaks all the time.
I reversed the bolt and nuts for crossover PCB to be mounted out the box on the rear side. Notice white glue and rubber washer..no leakage.

Hmm..does not look pretty yet. I'll put the board in a box when all is tweaked right..that's a promise for an old friend. How its measures now? well quite ok I think, both box sounds more balanced now.

Here is the crossover as per today :) waiting for better components, some are almost ready and still in 'burning' process. Nichicon Muses and BP, recycled Philipes- Epcos- Wima MKC , some green and silverish Russian paper in oil and maybe a pair of 30uF big oil can?..who knows.

As for now I felt little to be modified, its sounds already good enough for me, groans-moans and throat sounds of Diana Krall's voice is just awesome also her piano 'kick'.  Maybe I need to remove a little harshness and sibilance a bit for complex music. That's the next tweaks are for. Thanks for visiting.

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