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  1. Jonathan M

    Pic comparison with the regular/superbit release of Spiderman on Sanyo Z1

    It also helps if the actual frames are identical, which none of the above are. No comparison to be made otherwise. The only comparison is to grab the still frame direct off the DVD using one of the many DVD rippers available, and comparing directly. It'd be interesting to see just how much...
  2. Jonathan M

    Do you think we''ll start seeing more "fullscreen for widescreen" DVDs?

    Actually, seeing as the DVD picture size of 720x480 (for NTSC) is actually not 4:3 anyway (The 4:3 frame is 704x480), it is possible to put 1.3636:1 aspect ratio on a DVD simply by using all the frame (720/480*10/11 = 1.3636...). That's pretty close to the 1.37:1 you desire :) Ofcourse, with...
  3. Jonathan M

    bass content in surround speakers

    Just some points to consider: Most receivers actually use 12dB/octave Butterworth highpass filters. It's the lowpass filter to the sub that is usually 24dB/octave Linkwitz-Riley. This conforms with the THX spec. It's designed to work with a sealed cabinet with F3 of 80Hz (or whatever the...
  4. Jonathan M

    High Current vs High Voltage Amplifiers

    An amplifier is simply something that takes a given voltage, and amplifies it by some set factor. This is all fine and dandy until you actually hook a speaker up to your amplifier in order to get sound out. The speaker represents a load on the amplifier which is generally some complex...
  5. Jonathan M

    Soft High-Pitched Tone From Speakers At High Volumes

    Hey Chris, Sorry to hear of your problem. What version T752 do you have? (try holding pressing the AUDIO and VIDEO buttons simultaneously on the front panel.) The current model is either 1.20 or 1.22 (I can't recall which!). If you have an older model, you could ask your dealer for a free...
  6. Jonathan M

    Is more power really needed?

    Hey MikeNagy, I have a T752 and it does the job well for me running 5 custom built speakers all small with a decent sub (My own design). If you are only going to be using 2 channels, then I see no reason to go for the T762. As far as power output goes, the 762 does have more (Total 600W...
  7. Jonathan M

    Passive Biamping: How much improvement?

    There seems to be quite a bit of mis-information here, so I'll try and help clear some things up. In a passive bi-amp setup, where one is using the internal (passive) crossovers on a speaker with the various sections separated (ie any plates removed) then one has one amp powering the lowpass...
  8. Jonathan M

    Use switched outlet or no?

    As Bill has said, the switched power outlets on the back of receivers are designed with a limited current draw in mind. This is due to a couple of things: First, it limits the amount of power that the receivers' cable needs to supply (Usually not much of an issue), secondly it is switched using...
  9. Jonathan M

    nad with b&w speakers

    The Main-ins allow you to use the amplifiers for something else - ie if you decide to go for external amplification for some of the channels in the future, you have the opportunity to use the amplifier units (Front 3 on the T752, all 6 on the T762) for some other duty (For instance - powering...
  10. Jonathan M

    nad with b&w speakers

    I've heard a number of NAD power amps with B&W 600 series (Not the current series though) and they have all matched quite nicely. The B&W's are a good set of speakers (Probably what I'd go for if I didn't design my own) and the NAD amps provide good control due to their solid power ratings. I...
  11. Jonathan M

    2 Channel Power amp's.

    Why not stick with NAD - the C270 power amp is a nice 2 channel amp - plenty of juice. What's the sensitivity in-room of the LSi9's, and how loud do you listen? That'll give you an idea of how much power'll be required. I presume you are wanting more power than the 40W/channel the C320 offers...
  12. Jonathan M

    A Question of Balance

    I guess it comes down to how the digital filter is actually implemented - measurements would be the only way to know for sure - I'll look to see in the measurements I've done in the past if there is any indication as to the filtering method used. I think we agree on the best plan of attack in...
  13. Jonathan M

    Need help from electrical gurus... summing line level signals

    Ahh - now I understand! (Sorry for missing it the first time - a re-read of your post makes things clear!) You should be fine summing the LFE into the L and R channels if that is what you are desiring to do. I'd probably do this actively seeing as we are talking about the full range left and...
  14. Jonathan M

    A Question of Balance

    Hey Bruce, The point I was trying to make is that by putting an external xover only on the mains, you ARE using the internal xover in the receiver for the other channels. Here's a quote from your first post:
  15. Jonathan M

    A Question of Balance

    Hey Bruce, No, they don't screw it up exactly I don't think. Assuming that any digital delay (To compensate for closer rears or whatever) is applied before the digital xovers, then YES, that is a screw up. The delays should be applied to the highpassed signals only (As that's the only part of...
  16. Jonathan M

    Need help from electrical gurus... summing line level signals

    The gain stage for the LFE (If opamp based) will give the isolation needed - so summing with 22k resistors should be fine. (I assume you are summing left, right and LFE signals?) Any gain stage should have a low output impedance anyway, so cross contamination won't be a problem. Also, the LFE...
  17. Jonathan M

    A Question of Balance

    I agree with most of the comments above. Many receivers do use the THX inspired 12dB butterworth highpass and 24dB Linkwitz-Riley lowpass option, and in my opinion this is the best possible option for people who don't want big tanky speakers all around. My speakers were designed as sealed...
  18. Jonathan M

    Need help from electrical gurus... summing line level signals

    If you are summing the low-passed outputs from several active crossovers, you won't get any crosstalk, as the signals are buffered by the opamps used in the active xover stages. If you want you could always add a simple unity gain buffer first to each signal THEN resistively sum. Or you could...
  19. Jonathan M

    How long can a Coax cable be ?

    Anything under 100m or so will be fine - it just has to send a digital signal, and the attenuation will be very little. With the frequencies we are talking about (4MHz or so), the wire acts as a transmission line, and the interface between the RCA connectors will cause more of an impedance...
  20. Jonathan M

    NAD T752 & C270 opinions.

  21. Jonathan M

    NAD T752 & C270 opinions.

    Thanks Mark - I'll edit and correct the above post. Also, I have recalled the rest of the differences between these models: 1. Extra amp 2. More power (100W instead of 80W) 3. Main Ins for all 6 channels (Instead of just the front 3 on the T752) 4. Dual-zone 5. Extra component video...
  22. Jonathan M

    NAD T752 & C270 opinions.

    Hmm - I guess it depends on how much power you need for the fronts and surrounds. If you're wanting to go 7.1, then you'll need at least another channel of amplification anyway, as the T762 only gives 6, and the T752 only gives 5. If you only need the 92x5 supplied by the T752 for the centre...
  23. Jonathan M

    NAD T752 & C270 opinions.

    I have a T752 - if you are getting a separate power amp for the fronts (C270 for instance), you won't benefit all that much with going for the T762. The only things it has that are extra are an extra channel of amplification, more power, and a more inputs/outputs. You could reassign the front...
  24. Jonathan M

    HK 525 remote macro question

    One of the problems you MAY be having is that the receiver may not pick up signals while it is turning on. Try having the power on for the receiver as the first command in the macro, then do whatever else you need to do to the other components, then finally change to the correct input on the...
  25. Jonathan M

    How to plug a stereo keyboard on my AV Receiver ?

    What sort of outputs does the Keyboard have on it - does it have a line level output? If so, it should be fine. You could even use the headphone output if you wanted, though you may lose a bit of fidelity due to the headphone amp in the keyboard. Just keep the volume low on both the Keyboard and...
  26. Jonathan M

    I built my first sub, now it's tweaking time

    I wouldn't trust the RS meter down low - even with the "corrections" file. It has serious rolloff in the electronics, and who knows what the mic is doing. Some trust it, however. Can you do an impedance measurement of the box? If so, this will tell you fairly quickly if you have a leak, as...
  27. Jonathan M

    Questions about H/K 525 delay settings (may apply to more H/K units)

    Further to my post above, technically one would need 4 numbers for a decent delay setup - all relative to the centre. My T752 for instance assumes that the delay of both surrounds is the same, as well as both fronts. While this is the case in the ideal room setup, it is not ideal in all setups...
  28. Jonathan M

    Questions about H/K 525 delay settings (may apply to more H/K units)

    Question 1: Many receivers do this, or their older models did this. Basically, it is assumed that the distance from mains to listener and the distance from the centre to the listener is the same when the centre delay is set at 0ms. This is due to the fact that, in general, the centre is...
  29. Jonathan M

    Marantz SR7300 and Protect Mode

    Hi maolen, A receiver will only go in to protect mode if it gets too hot or if it suddenly finds itself driving a set of low impedance speakers at too high a level. This causes the voltage rails to droop which kicks the protection circuit on. Based on your experience, perhaps this is heat...
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