scriven

I have changed lots of lamps in McIntosh pre and power amps. (That is why I stock the lamps!) While it can be tedious to get to the lamps it is not difficult - if you can keep straight which end of the screwdriver or nut runner to hold. My stuff is older, vintage 60s & 70s; the MA6200 was designed in the late 70s so I don't know if it uses the same lamps.

Amy, You let Trey have them, AGAIN!!!! What on earth were you thinking?

Hi Bill, McIntosh amps should not make any sound at the output not found at the input! Is it on both channels? (If so, at once?) Is it when you are fiddling with the knobs? First try the obvious and make sure all the connections are clean and secure. Don't make me come down there and change your lamps! (If it uses the old bayonet socket style lamps I have a bunch of them and you are welcome to a set.)

---------------- On 7/3/2005 5:33:03 PM plissken99 wrote: ... Looks like my best bet is to save more and buy a Sunfire 5x... ---------------- That's pretty close to used Carver!

Dee, FYI - you only need this much of the URL to get to the item: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5785464372

http://www.shop.com/op/aprod-~blackout+curtain-p18376623 I use these in an eastward facing bedroom and they work very well. You can put them behind whatever curtains you want that go with the room decor. The best part is that they are only $15 a piece! You might also try posting this in the Home Theater section of the forum. Good look in your quest!

---------------- On 7/3/2005 10:22:17 AM WWOOF wrote: Caution: digital amps can take quite a while to break-in--more so than most conventional or tube amps... ---------------- Does it take longer to break in the speaker wire with digital amps?

For $.50 a watt you might be able to get some used Carver equipment.

Shawn, Thanks for the info. Allan, Of course, you are right! What ever was I thinking?

Yes, $30 was way too much! But, since you are a fellow Illinois resident and I would not want to see you suffer I will graciously give you $50 for them and remove the reminder of your terrible ordeal!

I run my Khorns with a MC2505 - 50wpc. I have plenty of headroom and the RF-7s are only 2 db less sensitive than the Khorns. Knorman is correct that too much power will not cause harm under normal circumstances. BTW: I would like to welcome to both of you to the forum!

---------------- On 7/2/2005 5:45:53 PM Number 9 wrote: Did you try and look at my original links? ... ---------------- Yes I looked at them. Did you miss that I was quoting from one of them? I also read the Rubinson review. He raised many of the same questions that I did. I would be more interested in a comparison between the Trinaural processor and a L+R center instead of a 2 channel setup. I can make most of the same statements about a L+R center he made about the Trinaural processor. Ok, now I understand that Trifield is a form of Ambisonics - indicating that it is useless for existing 2 channel recordings.

I don't know about power amps but if you want to run 200 watts into RF-7s you should definitely invest in some very good hearing protection!

Number 9, Ok, could you please lead me into your highly sophisticated world by helping me understand some of the following? The items in quotes are from the http://www.ampzilla2000.com/trinaural.html site. "In other words, you cannot just add a summed center channel and be off to the races because the power levels end up being totally destroyed." I know it is simplistic but what is wrong with using a potentiometer to tame this problem? How are the power levels being destroyed? "The only way to do this is to re-vectorize the composite stereo information." What exactly does this mean? Is he claiming that he is decomposing the stereo signal, recreating the point source for each sound and then recreating the signal as though there was a center channel microphone? "In addition, the cross-coupled error information is virtually eliminated from the opposite speaker and split between the corresponding right-center or left-center pair." What exactly is cross-coupled error information? What are the right-center and left-center pairs? I also get very leery of anything that says: "Of course, like all other new experiences, one must LEARN or should I say RE-learn how to listen in order for the ear-brain link to correctly interpret this new sonic information. This process may take typically a week or two." I didn't take weeks to "RE-learn how to listen" when switching from mono to stereo. That would seem to be much more of a drastic change than adding a center channel, no matter how it is derived. (End of quotes from the http://www.ampzilla2000.com/trinaural.html site.) Also, I checked Merriam-Webster Online, Cambridge Dictionaries Online and Rane Professional Audio Reference and I could not find entries for trifield and trinaural. What do the terms mean? I did find Ambisonics in Rane: Ambisonics A British-developed surround sound system designed to reproduce a true three-dimensional sound field. Based on the late Michael Gerzon's (1945-1996) ( Oxford University) famous theoretical foundations, Ambisonics delivers what the ill-fated quadraphonics of the '70s promised but could not. Requiring two or more transmission channels (encoded inputs) and four or more decoded output loudspeakers, it is not a simple system; nor is the problem of reproducing 3-dimensional sound. Yet with only an encoded stereo input pair and just four decoded reproducing channels, Ambisonics accurately reproduces a complete 360-degree horizontal sound field around the listener. With the addition of more input channels and more reproducing loudspeakers, it can develop a true spherical listening shell. As good as it is, a mass market for Ambisonics has never developed due to several factors. First, the actual recording requires a special tetrahedron array of four microphones: three to measure left-right, front-back and up-down sound pressure levels, while the fourth measures the overall pressure level. All these microphones must occupy the same point in space as much as possible. So far, only one manufacturer (first Calrec, bought by AMS, bought by Siemens, sold, now Soundfield) is known to make such an array. Next, a professional Ambisonics encoding unit is required to matrix these four mic signals together to form two or more channels before mastering or broadcast begins. Finally, the consumer must have an Ambisonics decoder, in addition to at least four channels of playback equipment. It sounds to me like this requires that the original signal be recorded to very specific standards where as L+R works with existing recordings. Thank you in advance for your help on this.

I think they had a pretty big unveiling at the Pilgrimage!

Here is some of it. The price puts it out of my range! BTW, nice cartoon! http://www.sweetwater.com/store/category/c670

---------------- On 6/30/2005 9:51:49 PM garymd wrote: The grills on my '72s weren't made to come off either. I believe it wasn't until about 1974 that they started making them removable... ---------------- I have one pair of '72s and a pair of '81s. The grills on both are removable!

Tom, Good point on the volume. After playing around with my speakers in my room I found that 3db below the mains works well. Since you will be using your speakers in your room - your mileage WILL vary!

Bill, I have replaced a lot of lamps in McIntosh equipment but not the model you are asking about. While some are tedious none were all that hard to change. Edit: Some day I am going to learn to type!

I can go back to a 2 channel with the flip of one switch. That switch only gets flipped when I am demonstrating the difference to someone. As Royster said, " most of us DO NOT use the gadgetry of today's ht set-ups " it is not because we are not purists or unsophisticated. In fact, I will argue that we are the purists in this discussion. Gopher, Back to your original question " How is this done with a 2 channel amplifier?" The short answer is - it isn't! You need a third amp to drive the center channel. As far as how to wire it, Gil McDermott posted the DfH with the mini box plans late last year. Here is the thread. Here is the DfH pdf.

---------------- On 7/2/2005 10:05:01 AM Maron Horonzak wrote: ... Alot of the present pop recordings do not sound very good in trying a phanthom center channel, too phazy... ---------------- A lot of the present pop recordings do not sound very good in 2 channel!

Can you take the Carvers to the RF-7s and try that?

---------------- On 7/1/2005 9:54:52 AM Amy Unger wrote: ... Sciven, I did not get your email! ... ---------------- I tried again. (Also, I got a failure notification on the first attempt this mourning.)

---------------- On 7/2/2005 1:21:23 AM Number 9 wrote: Hey, I tried it too at one time. Maybe I should not have said "everyone". Let's put it this way, there are purists who have moved on to more sophisticated approaches than just a summed channel. I can see the logic with Klipschorns, that are wide apart in a room, to avoid a hole in the middle effect. ---------------- Oh, so now I am impure and unsophisticated?

I'll put my money on the room.