Welcome! Need support, you got it. Or share you ideas and experiences.
In Reply to: Re: Prometheus Mk2 - More questions posted by Clive on May 19, 2005 at 07:14:50:
I guess it wouldn't hurt to try tight coupling as opposed to decoupling.
The proof of the pudding...etc. I'm still apt to think, at this stage, that keeping the sub boxes off the rear baffle plate is a better idea than tight coupling or just sitting them there. The latter would be a good option for storage or space saving but that's about it.
I still think total seperation of subs from baffles during operation would yield the best imaging.
the very first consideration with the Prometheus subs is break in time. Until the widebands and subs gel at or around 400 hours you are chasing you tail. I have just finished breaking in my 3rd pair of Prometheus and its best to reserve all judgment until after the 400hr point. Although they are very listenable right out of the gate they travel through many audible changes during this process.
Once the Prometheus speaker system hits its stride it is just a matter of taste. A Taste for Bass! I too have found my favorite place by moving the subs around. However, I have also found that placing the subs next to the widebands is a very valid option. Clean, extended and articulate bass with seamless intregration with the widebands. In fact I have turned them backwards, forwards and sideways at the widebands with very little change in the perceived sound. Placing the subs near a room boundary tends to bring in room modes. The added benefit of having 2 subs boxes in a room is they balance out the equation no matter where you place them. Again a Taste for Bass!
This brings us to the issue of decoupling. Yes I hear a noticeable improvement with both the baffles and subs on spikes. How much improvement, well now we are getting subjective aren't we. Add in the Magic Twins to this process and now we are talking a noticeable tweak. Guaranteed or your money back. Again wait till after 400hrs to reserve judgment. (Parts Express.com sells some real nice looking spikes for the price. Search spikes). Peace.
Yes, what you say makes sense. The main thing is to break them in first.
BTW, what sre these 'Magic Twins' you mentioned?
the Magic Twins are a filter network that removes high frequency RF(radio frequency) from your Hifi system. The Magic Twins are a Bastanis exclusive. Although the name implies "magic" they are solidly based on Science. As you know any length of metal wire is an antenna. Vary the length of wire and you vary the frequency it can "receive". This means anything from as small as resistors/caps on a circuit board to long lengths of speaker cable all end up as potential antenna's. What is received on these antenna's can be man made to extraterrestrial. The only thing we want traveling on our wires is the musical signal. No ET please!
This as a given, there are numerous schemes to remove these signals from getting a free ride on our wires. Properly designed power supplys, circuit board grounding, twisted pairs of wire, numerous shielding techniques and more. The interaction of all these schemes still allow RF to end up on our cables. Enter the Magic Twins to remove the remaining RF signals. There are 2 types of Magic Twins, RCA and Speaker. We have found the best place to install the RCA MT's is where the source(CD player, Phono, ect) enters the preamp. Next is where you RCA interconnects attach to your main amps. The speaker MT's simply attach to your binding posts on your speakers. (With the Prometheus it is best to solder them directly to the wideband terminals).
The idea here is to filter out the RF at optimum locations. Prevent RF from reaching the preamp, next prevent it from reaching your amplifier, finally filter it out before it reaches your loudspeaker. A total system approach to eliminate RF in your Hi-Fi system. What you have left is the pure musical signal. This also allows you to use very simply designed cables. No twisted pairs, shielding or black magic required. Those techniques introduce more problems then they resolve.
The ability to "hear" the difference has alot to do with the interactions of your components, wires, and speakers. For this reason we offer a 60 day moneyback guarantee. The best way is to leave them in for 30 days then simply remove them and see if you can live without them. The cleaner and more efficient you system, the more you will "hear" what they are doing. With the Prometheus speaker system, SET amps and a TVC preamp you can easily hear the improvement of removing RF signals from your Hi-Fi system. Mileage will vary with other systems.
I second the "break-in" time needed for these to really start to relax.
I had a lot of sibilance the first few listenings. So...I covered them with blankets and put a couple of Radiohead CD's on, cranked them up...and left the building. After several series of loud 2-3 hour "bursts", and some 24 hour a day low level "space music" with a lot of weird freq sweeps, and some sound effects CD's ... every time I take the blankets off for some evaluation listening, it gets better and better. I recently took the blankets off and heard notes...just... hanging in the air...very nice...got one of those "smiles" that I get when something cool and unexpected happens.
Planning to put some solid brass decorative handles on the subs so I can move them around more easily. Everything is solidly spiked.
Still have a couple of weeks of "bursts" and UFO music to go through...but it's been worth it so far...!!!
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