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cdave

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About cdave

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    Adelaide
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    Australia

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  1. cdave

    5 Way Active Speaker build....

    Thanks Dave, it was the directivity I was thinking about given the number of drivers and the (large) vertical distances between them. Reflecting on my experience with d'appolito speakers. I found that the more accurately they were setup vertically, in both fore aft and sideways, the better they sounded. I speculated that this best time aligned the upper to lower driver pairs with both the listener position and the room surfaces. Going back to the OP's design, even though the pairs are going to be digitally time aligned, I'm not sure if there would be time alignment issues between the individual drivers of the pairs, given the large spacing? And if there is, can that be addressed in the design such as minimising driver distance separation?
  2. cdave

    5 Way Active Speaker build....

    That's my understanding. You could angle the drivers to face the listening position?
  3. If I remember rightly from research over 10 years ago?! 1 thick glass out performed 2 thin pieces of glass. Double glazing with 1 thick and 1 thinner performed best. The frame material / design was also a factor. Costs may have changed, but back then the thick glass option was significantly cheaper than double glazing for 2 small windows. We considered gyprocking and insulating over the windows and I suspect it would be more effective than money spent on window upgrades. I think an insulated window plug could be made to perform very well; possibly better than expensive windows?
  4. cdave

    5 Way Active Speaker build....

    Scratch that. Just remembered the multi amp and DSP so digital time alignment.
  5. cdave

    5 Way Active Speaker build....

    Have you considered stepping the baffle for time alignment?
  6. Yes thicker glass, no thermal breaks , no plugs in a dedicated cinema room. There are only 2 small windows which are under eaves and have heavy light blocking curtains. So no thermal concerns and the noise is quite well contained. I have considered making up some light plugs out of cardboard or foam. We mostly mostly use the cinema room at night and the light blocking curtains work well, so never got around to it. Good luck with your room.
  7. "With the window i was going to get a roller shutter on it and just have it double glazed and put some accoustic foam on the inside." When I did my room I read somewhere that thicker glass was more effective in blocking sound transmission than double glazing. It was worked out cheaper and if you are plugging the window with insulation, the additional cost may not be warranted?
  8. Hi Dave, I'll take one of the 75cm. Postage back to Adelaide
  9. cdave

    Resonance vibration issues

    Thanks Frank. I put a concrete paver on top of the cabinets as an experiment and the sound became more focused. I think it worked as my speakers are floor standers ( a narrow base and a relativley high centre of gravity and not overly heavy.)
  10. cdave

    Resonance vibration issues

    Hi Andy. Im no expert but I was trying to damp the cabinet movements to 'lock' the drivers in a physical space. In my head I imagine it allows the drivers to more accurately reproduce the positive and negative air pressure without the 'pollution' of the box movements. I also picture the directional high frequencies like a laser attached to the speaker cabinet pointing at the listener. If the cabinet moves, the 'laser' projected over a distance is moving around quite a bit. No idea if we can hear this? But I imagine the sonic image to be more focused / stable if it doesn't move? It would be an interesting experiment to try this with a laser attached to the top of the cabinet shining on to the wall behind the listener to see how much movement there is as volume increases. You could then see the effectiveness of different damping techniques? (Except fore and aft where you'd need to shine up onto the ceiling) Hope that helps. Cheers Dave
  11. cdave

    Resonance vibration issues

    What he said,.... thanks Frank [emoji3]
  12. cdave

    Resonance vibration issues

    Yes, thanks AF. I also use bolts on a timber floor. It raised the tweeters to a better height and sounded better than felt pads. I also tried leaning the speakers back but with a d'appolito speaker, I think it changes the distance between the top and bottom drivers and smeared the timing. In fact the more accurate the upright settings were, both fore and aft and side to side, the better it sounded. Mass loading the speaker cabinets also helped focus the sound. I asked because recently I've been reading about people having success with decoupling their speakers from timber floors.
  13. cdave

    Resonance vibration issues

    Sorry if I missed it earlier, what did the pads replace, spikes? What type of floor? What did you replace the pads with to make " the speakers sound even better"?
  14. cdave

    Z - love

    White 240Z 1970/71[emoji106] Wish I still had mine...
  15. cdave

    Speaker BUZZZZZZZ

    I had the same symptoms in 1 speaker only. After rerouting the speaker cable away from anything power related (cables, packs, outlets, components) problem solved, dead quiet
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