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In Reply to: RE: Any experiences with different caps in the Prometheus posted by doughter on August 31, 2008 at 04:24:01
If you are even thinking of going to the Atlas setup it is a no brainer. Most people have a problem because they have time and money invested in a single driver baffle. The Atlas setup (IMO) will give you the following: Better dynamics, less distortion, and yes, a larger, denser presentation of the music. Depending on your room size, the original 12" driver subs should be sufficient. The only downside is the cost of the driver and reworking the baffles. Also, your amp must be able to run a 16 ohm load. Most can without a problem but you will get less power due to the impedance mismatch (assuming no 16 ohm taps). I use an Emission Labs 300b XLS to get some of the power back. I just set my cathode current to 107mA using an adjustable resistor. Oh, BTW, if you are using a mesh plate 300b that is giving you a lusher presentation than a solid plate at the expense of detail, accuracy, openness, and even soundstage. Depends on what you are really looking for.
Regards
Tony
Follow Ups:
Tony I'm using newer Western 300bs.
It sounds like adding a second driver might do it for me. I'm also thinking of buying a Tone Tubby hemp alnico driver to see how it compares in open baffle.
The 16 ohm is not possible but maybe they could be wired differently. I have tried 16 ohm with other amps and it gave me too much treble and not enough meat.
Your amp can probably take the 16 ohm speakers without a problem. The only other option is to wire in parallel which will give you a 4 ohm speaker. My amps did not like that at all but YMMV. You will get less output but the bass will actually be a little tighter in most cases (at 16 ohms into an 8 ohm tap).
Those tubes are pretty nice from what I have read and heard but they will take quite a bit more cathode current than a mesh plate and will probably sound a bit better when driven harder that is assuming that you are still running at about 68mA or so. If your amp is self biasing their website notes that you can run up to 100mA safely. Elsewhere on AA you can get ideas as to the sound with increased current.
If you get the Tone Tubbies I would get the treated ones and the 16 ohm units as you can parallel those to get a nice 8 ohm speaker. You may have to lower the crossover point a bit in case the TT's don't go quite as high in their response. The tweeters can go much lower than 10kHZ. Go to Audiocircle.com and tap into the open baffle forum if you haven't already.
Best of luck.
Tony
Thanks for the tips.
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