Thor or Orion

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#23
bhg41088 said:
Wow, thats 800$ worth of EQ and Xover right there. I wonder if anyone has done a passive Orion? Would be way, way cheaper.
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Doubtful.

Across their pass-band the woofer sensitivity drops about 16dB due to dipole roll-off (2.6 octaves @ 6dB/octave) and about the same from very low Q (Qts = .17, the air in the H-frame raises it a little) for 32dB total. You'll need a much larger and more expensive amplifier to maintain the same output capability with a passive cross-over.

There's a shelving high-pass filter, three shelving low-pass filters, two notch filters, four all-pass filters, two fourth order low pass filters, and two fourth order high-pass filters - all built with 1% resistors, 2% capacitors, and gyrators with those tolerances in place of inductors. Total parts cost in active form with $.10 resistors and $.50-$2 capacitors is about $350 + $100 for the boards (including the $50 recommended power supply and enclosure) and 60W/channel amps are inexpensive from DIY or used sources. Jon's passive Arvo XOs using higher tolerance parts and noall-pass filters (SL believes these to be essential) were $500.

You could physically align the drivers although then it wouldn't be an Orion.
 
#25
If you want to try a Linkwitz design with a passive crossover, he has the PMTM1 design.

PMTM1 Page

I am planning to build the PMTM1, then a woffer based on the PW1 design. After I get that working, I want to migrate to active crossovers and a gainclone or 3.

Cost for the PMTM1 don't look outlandish.

Doug
 
#26
I have built the Thor and I'm not very happy with the sound. Often, too bright and revealing. I have also listened Orion and they are much better in every area. You may also consider NAO or NAO-AEP dipole design, which has passive HF filtering and active filtering for U-frame woofer.
 
#29
It seems that the Thor is a speaker you either like or dislike. I'm not quite sure why, but they can sound a bit nasty with an amplifier they don't like. I use a diy Aleph 5, which seems to be a very good match.

When my Thor's were brand new they were quite hard and bright, and the drivers didn't integrate very well. So at first I was disappointed with their performance. Fortunately this changed for the better 🙂 But it took at least a month or so before they really sounded "right". This tweeter seems to need an unusually long burn-in period.
That should affect the Orion as well I think..

I don't think you need to feel bad about going for Thor. The Orion is probably a bit better, but Thor is still a very good speaker.
 
#31
bhg41088 said:
Wow, if you look at the responce and the reviews of the Seas Excel line, they seem very unworth the price. Maybe i should look for something Peerless CSX 6.5 (850122) based, as i love the sound of them open baffle.
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I'm not sure where you're reading this. The seas Excel compare very well against the best Scan Speak and other socalled highend speakers.

Hans.
 
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