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TOPIC: Re: Polk Monitor 70 Tri-Amp Project

Polk Monitor 70 Tri-Amp Project 6 years 10 months ago #7121

  • Cybershaman
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Hello, all! Here we have my Polk Monitor 70 II speakers which I have removed the passive crossovers from and used the miniDSP 4x10 Hd in their stead! They sound amazing! I tell people in the Polk forums that they do tricks! ;)

Specs:

Tweeters - 2.4KHz High-Pass LR 24db/oct - power: S-5 K-501 10 watt/ch. Mono Block Tube Amp Kit (new version of this kit)
2 Upper Woofers - 2.4KHz Low-Pass LR 24db/oct - power: Carver TFM-15 100 watt/ch.
2 Lower Woofers - 700Hz Low Pass LR 24db/oct - power: Carver TFM-15 100 watt/ch.

This is close to what Polk had the passives set to. They had the high crossover point at 2.6KHz 12db/oct. It's also unusual in that the mids don't use a band-pass. They refer to it as a "2 1/2-way" design. Whatever. With the miniDSP I can experiment! In fact, right now I threw in a little 0.01ms delay on the tweeters to align them a little better. I also use Dayton Audio's OmniMic V2 testing software to dial in the tweeters because the tube amps I'm using to power them are a little low on the gain.

All in all, I'm very happy! And I can use the miniDSP unit for future speaker projects. (which you will be seeing here, for sure!) Take care all! :)


(Note: I just moved all of my components and have yet to hide all of the wires!)

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Re: Polk Monitor 70 Tri-Amp Project 6 years 10 months ago #7164

  • devteam
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A very nice setup you have here!

Thanks also for sharing your settings for your configuration to the Polk users out there!
I agree that it's always a pleasure to work with an active setup to make a system sound better... that's a DIY feel that is quite unique! :-)

Thanks again for sharing your project and have fun with your system!

DevTeam
MiniDSP, building a DIY DSP community one board at a time.
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Re: Polk Monitor 70 Tri-Amp Project 6 years 10 months ago #7174

  • Cybershaman
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Again, I am VERY happy with how things turned out!

In the settings department, I had to drop the two low-pass filters down by 3db because, again, the gain on the tube amps is pretty low. I hope this helps anyone who tries to replicate such a beast! ;)

In other news, I am sad because the motherboard in my laptop died after a shock it received when I tried to plug in the USB microphone. I should have it repaired soon. I need to because I think I may have set one of the crossovers incorrectly because the Dayton Audio software showed a dip right around the point where I cross the tweeters over to the upper woofers. I think I set the upper woofers to low-pass at 2.4KHz and the tweeters to high-pass at 2.6KHz by mistake. Rest assured, I will be back with the results once I install the new mainboard in my laptop!

For what it's worth, perhaps you can take a look at an issue I am having here.

Thanks again for offering such a fine product! :)
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