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About BioBrian

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  • Birthday 06/11/1954

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  1. Yes, that was certain to get me into trouble, wasn't it? Sorry. But we would both have to compare both, which can't be sorted easily, and I certainly don't want to argue the point. What I was referring to was that in live venues the sound often comes from multiple sources, and arrives out of phase, or with actual echoes, which puts an end to any chance of enjoyment (for me). BTW, and I don't know how to do this adequately, I would like to thank you, and the other members who were so valuable in helping me make this huge amplifier choice.
  2. The system has been put together again now, with a few changes from before. My 4-way speakers now have a single Luxman M-900u amplifier driving them; its combination of grunt and finesse are off the scale. The reviews speak of the extraordinary imaging to be heard from this amp; it's something I've never experienced before. Incredible - very very pleased! But why did they only supply one pair of white cotton gloves? The beast weighs in at 48 kg - OH&S alert! The 'Gestie' subs, now up in the wall/ceiling corners behind the listening area, have been interesting to play with. For now, they are just being fed by my 6th of March kanga-filter (roo-dimentary, if that was too obscure) and a 70 W Cyrus integrated amp. When the main speakers are switched off, you can only hear a low grunting, which indicates very effective cutting of high frequencies - enough to relax about that for now, and deal with the more gross issues, "how much is enough", and "are they even in phase, 'coz I can't hear them unless they get 27dB boost". The most important observation so far is that recorded music has a crazy variation in quality and quantity of bass material. "Dead Can Dance - Live" has, to my taste, a ridiculous amount of bass, and the subs only balance the mains (and are still choofing it out) with some cut. Despite the word "Live" in the title, the sound I'm getting has a clarity not remotely possible from a live venue, or at least that's my experience. Some classical tracks need up to 27dB boost for them to start giving a feeling of warmth; that the subs are actually contributing. SO - they are going to need a volume control, readily accessible from the listening position. The nice STX Neutrik Speakon plugs clicked into place in the cabinets - sadly that's a little pleasure I won't be repeating often, as the filters are at the amplifier end of the cables, for easy R & D. There's a curious thing happening with the passive filters, which I'll look into further at some stage. Need more bits - here we go again...
  3. I'll be honest, Dave, it's been a struggle. And now the interesting part begins, as you've pointed out. But whatever, I'll have 2 lovely benches and a white beam to live with. And a clear floor area at last, to enjoy (and probably to defend vigorously).
  4. Good point Mike. Can't be sure until testing, but there is a bit of spring in the brackets, a bit of stretch in the 100mm bolts, and 8mm nylon pads in each corner. May need to clamp the bottom to the plywood-faced wall. Tying down everything else in the space could get interesting.
  5. Must be something in the water. Something arose again today. Had to do different brackets on this box, but experience made this one easier. Well, at least to begin with. Getting it up is one thing, but getting it in was not a given. Bit tricky with that beam, and all the junk to miss. 'Creep' range is great for this job - 1st gear would give 200 m per hour at full throttle! But the diesel fumes... Transfer from slings to chain blocks, and nearly a case of "there's no backing out from this one". Anyway, symmetry at last - home sweet home I did manage to feed the cables, but it's time to put something else up - my feet.
  6. Got something up at last. Not bad for 11 months - wonder if it'll catch on? (Such fun, and character building too).
  7. Not quite as part of the system - just a few minutes of augmenting the chaos of main speakers stuffed behind the couch and in a poor room position. But they do go deep! Can't be long now to get it all together, but you're most welcome as usual, to call in and check progress (or wave the whip, pull the chain; whatever inspires you).
  8. Ha, had to laugh - when this came through I was listening to Elgar's Pomp and Circumstance March No 1, with "Land of Hope and Glory". Thing is to always have something to look forward to 😉
  9. Apologies for going off air - it was one of my pre-install conditions that the rusty RSJ beam across the workshop gets painted, having waited 26 years. This meant that after an initial listening (OMG moment) to these subs, everything got packed away to avoid the revolting rust dust, paint spatter, fumes, etc. My scaffold was all ready, the first problem was waiting for diesel stink to disperse. Then it was all respirator/ear muffs/glasses etc in a very uncomfortable period, spaced according to physical limitations - I guess no further comment needed. But on seeing this, I can happily reflect that yes: - I built the crate - I built the forks - I built the front end loader Seems like another life back there. The design of mounting brackets has been eclipsed by the problem of how to get these effers up there in the ceiling corners. Some progress today with the finding of shorter "chain blocks", and further, that their long hooks can be replaced with shackles. The problem being that the centre of gravity of the speakers needs to be below the lifting point, otherwise they could spin and crash, with unspeakable consequences. So the above 'angles' are to fix them to the ceiling; another set of brackets are being prepared for the chain blocks to hoist them up (and down again in the future). Meanwhile, there might have been very exciting new arrival, so - must focus, must focus, must focus... Brackets - yes, brackets will add to that uplifting thing, won't they?
  10. Wish I'd known about this for my sub build - if it's not too OT, I'd be interested in a pic, or explanation of how it works. I've found quite a few cases where the Festool track saw can't be used without major jig-building, so always looking for ideas.
  11. Ha - very succinct appraisal of this thread there, @STROP. Things have changed, but maybe the present-day instant gratification isn't all it's cracked up to be. (I was quite fond of the blood stains on these boxes enclosures).
  12. After settling on the minimal stuffing in both boxes, I proceeded to adventures with the soldering iron. First approximations were done using 0.55 Volts input, 250ms gating, nearfield: Black - No filter Red - Adding 12 mH in series with driver: "1st order" Blue - Adding 150 uF-1R across driver after the coil: "2nd order" Green - Vent only I've seen this before - a "2nd order" electrical setup doesn't equate to a 2nd order acoustic result (12 dB per octave slope). I suspect I'll need more components to make it "4th order", but I'm keen to hear what these guys can "do for me jollies".
  13. Omnimic has this Bass Decay section specifically for this job. I'm only fairly new to this function, but It's been very clearly showing the differences with stuffing. I think it has a background noise cancelling skill, as it needs at least half a dozen sweeps to get rid of a whole bunch of spurious stuff on the graph. But the measurements so far have all been "nearfield", where you put the mike right near the dustcap, so the driver noises are proportionally astronomical, compared with room reflections. The nice curves got thus are usually ruined, as you say, as the mike gets taken further away, when room reflections etc start to make themselves a nuisance.
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