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In Reply to: cornwalls versus audio nirvana / fostex posted by steven13 on April 16, 2007 at 16:18:00:
I'd look at the amp first. You said it is a 2A3-like, so does that mean it is not a 2A3 amp? You might want to get the 30 dollar Sonic Impact digital amp just to see if your speakers are dark with that. If they are, then I would look at the drivers, you might have blown tweeters. Cheers.
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Oh, yuck. I've tried the cheap digital amp fad: the SI and that 3 ch TEAC that was $100, and just a little better. Dry as bones and had no life. They also lacked detail, IMO. They're a window into what good amps can do, but don't take you there. I like my current SET better than the class A SS (Forte 1a) I was using before, which makes all those digital amps (and some more respectable amps)sound cheap.On a different topic, I kind of want to make use of the Forte 1a to power the woofer and use the SET on the horns.
Hi Steve, you might have missunderstood my point. If you try a cheap-O amp and they are bright, albeit crappy sounding because of the amp, then your speakers are fine and you should look at your amp as the possible problem. Does that make sense? Cheers.
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I have Klipsch Lascala's and heresy's. I am selling the La Scalas due to the negative WAF of their large size. I bought a pair of commonsense audio's super 8's and built the MKII big port cabinet. Compared to the heresy's, the AN super 8's give a more realistic "you are there" sound. In fact, they have a similar sound to the LaScala's but are not quite as dynamic. I was very impressed with the treble and midrange of the AN 8's which sounded as good as Mr. Dick's claimed. Not so impressed with the bass which sounded thin and lean. An 8' cone with ± 1mm Xmax does not move much air. This, along with a Qts of 0.215 suggested horn loading, so I built a prototype spiral horn. The dynamics and detail increased, and I now have solid bass to about 55 Hz. Even my wife commented that my home built horn sounded better than anything that she had ever heard. In pursuit of the "ultimate" speaker, I adjusted the MK II cabinet to give a fairly flat response down to 70 HZ and use a subwoofer ( heretical to the fullrange driver world )to fill in below. Now I am truly satisfied with the sound. Deep clean bass, gorgeous midrange, and clear crisp treble. Enough of my rambling, the Audio Nirvana drivers seem to be well constructed and worth every penny to me. Although the 12" will give more bass than the 8", I don't think that you will be satisfied with the bass in the provided plans. I would look at optimizing the cabinet plans with a software package, or using a subwoofer to fill in the low end bass.
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nt
all the best,
mrh
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best used in push pull, rather than single ended mode
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The indirectly heated cathode equivalent of the 6B4 - 6A3 is the 6A5G
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nt
all the best,
mrh
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