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Posts posted by JohnA

  1. Lack of bass from 2 different speakers in the same room is most likely a room mode or placement problem. No amp regardless of its design or quality will make a large difference in bass response (unless it's clipping). Room placement, OTOH, can make a difference of 10s of dB. Move something around.


  2. Jeff,

    It is not bad to run a pair of speaker on each channel (left and right), no matter what the impedance of each speaker AS LONG AS you don't push the amp. Amps are damaged by heat. Heat is caused by current. Low impedance draws more current. The lower the impedance, the higher the current. If you limit the power output, most amps can be operated at 1 or 2 ohms. At 1 or 2 ohms, though, the safe power output (that keeps heat below safe limits) may be so low the amp may not be useful. That's why manufacturers state minimum impedance is 4 ohms, typically.


  3. It won't hurt anything. It also won't increase power to the speaker.

    The A+B switch connects the A terminals and the B terminals to the same output point inside the amp. Therefore, it cannot allow more power out of the amp (unless, maybe, you are using itty-bittty 24 gage speaker wires).

    It is NOT biwiring unless you hook the A wires to one of the dual terminals on the speaker and the B wires to the other AND switch to A+B, PLUS remove the speaker's jumper bars.

    You ARE asking about A+B rather than L+R, aren't you (connecting L+R to the same speaker terminals would be pretty stupid)?


    This message has been edited by John Albright on 03-14-2002 at 06:17 PM

  4. Not enough information to determine what might be wrong. It sounds like a loose connection.

    For the best quality audio and video, minimize the number of components a signal passes through. For example, connect the DVD video directly to the TV, not through the reciever. There is no reason to send the video through a reciever unless your TV has only one input.


  5. My front channels are run by an HCA-1203A. Last night I swapped it back in, replacing the AV-8s. I like it better. The AV-8s have a haze to the sound. At first, I was thrilled with them, but as I listened, I heard things the shouldn't be there. I believe they are having trouble with my La Scalas' impedance curve (4.5 ohms at 55 Hz and 42 ohms at 2200 Hz). There is only one impedance tap and it's 8 ohms. Not knowing any better, I might have bad tubes. One amp is more distorted than the other and that leads me to question the tubes. As I learn more about tube amps, I may modify them. Initially, I wanted a kit anyway.

    I really wanted them to have "magic", but my conclusion is my 1203A sounds cleaner and sweeter.


  6. As of right now, DVD audio does not come out of a DVD-A player as digital, so an optical input on your preamp cannot be used for DVD-A.

    If you connect the DVD-A outputs of a player directly to a power amp you will have no volume control and the system will only operate at maximum volume; not good.

    To hear DVD-A you MUST have analog inputs on a preamp (or preamp section of a receiver). You may choose to use stereo analog inputs for DVD-A in stereo a I have. If you want to hear DVD-A in 5.1 mode, you MUST have a preamp with 6 analog inputs (and 6 analog outputs to go to the power amp) or a receiver with 6 analog inputs.


  7. I got a pair of the Wave Av-8s in last night and plugged them into the system. They do sound good; no hum or hiss. There are subtle differences in the emphasis of certain sounds over my Parasound amp. Are they better? I don't know. They are enjoyable and MAY be less fatigueing, or maybe not. All of the differences are subtle and would not be noticed in casual listening. I think the mystique of tubes is more thrilling than the actual sound.

    But, I do like them and would recommend anyone buy a set. I may end up with 5 in the end, depending on how well they perform playing AC/DC. They did yeoman's work playing Loreena McKennitt last night.

    The schematic above labeled WaveDT matches the schematic supplied with my amps (I did not check the component values, but the diagram matches as do the voltages). My version is faint, so I may not be able to scan it for upload.


    This message has been edited by John Albright on 03-08-2002 at 05:07 PM

  8. Ratings aside, I don't believe ANY amp is so linear that it would double its power at clipping when the impedance is halved. There are plenty of amps that are *rated* at 250/500/1000, but they will typivally clip at something along the lines of 350/520/1000. My old B&K M-200 was a good example.


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