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Old 8th April 2008, 02:04 PM   #11
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Dead sure ! I can recommend the Obbligato capacitors. They are also a favourite in Tony Gee's Cap test: http://www.humblehomemadehifi.com/Cap.html . Use 10 Watt low inductive resistors.

/Erling
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Old 8th April 2008, 03:23 PM   #12
Vix is offline Vix  Yugoslavia
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Or, there's and alternative to an L-pad: Semi-active approach.

Use two amplifiers. Run them from the separate preamp. One of the amps could be an "integrated" one, so you can adjust its volume compared to another amp. Use passive crossovers, as before.

This solution has some advantages:

You can increase the level of the amp driving Alphas, to match the level of the amp that drives Fostexes, resulting in higher overall sensitivity. You can use your tube amp just for the Fostex, and can use some high-powered SS amp for Alphas. You get better bass and also midrage may sound better since the crossovers are separated;

If you don't have the separate preamp ouputs, you can "tap" the bass amp from the output of the tube amp, before the high-pass crossover...

All you need is another SS amp...

Of course, you can use active crossovers, but that's another story...
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Old 9th April 2008, 03:16 PM   #13
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so before i order parts for x-over... can someone confirm that the prior mentioned values for low pass and high pass will work?

i want to run the setup from one amp so going seperate amps will not work.

and i want to stay passive.

thanks for all your help
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Old 9th April 2008, 10:18 PM   #14
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Richard,

The values are OK. But alternative L-pad values of 2.7 and 15.5 ohms will give 3.6 dB damping which may be a better solution to start with and adjust further if necessary.

If you would go for cheaper high-pass you could choose Dayton DMPC-30 30uF 250V Polypropylene Capacitor at Parts Express(which I don't know the quality of) and later upgrade to Qbbligato if you are not satisfied.


/Erling
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Old 10th April 2008, 08:58 AM   #15
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Richard,

Another way to choose to take down the Fostex would be to place just a resistor in the signal lead before the High Pass capacitor crossover component. 4 ohms would be a perfect value.

/Erling
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