Sandwich Time

-

 

I thought I'd get the base material together for the 'mule' speaker baffle I mentioned the other day. Pictured is the glue-up of the two components of the laminate: 20mm particle board glued to 10 9mm ply, which will form the outer surface of the baffle. When it's dry, I'll size it, rout the holes and rebates for the drive units, and seal the whole deal with a PVA-based varnish I've got, which is perfect for sealing timber or composite materials, and will hopefully compensate for the asymmetry of the laminate's moisture absorption characteristics and prevent warping of the finished piece. For future reference, I might opt for a thicker baffle, with a second skin of ply on the rear, which would make a heavy and stable baffle of 40 38mm thickness, which should both resist bending forces and help to smear out any panel resonances [just a guess, but this is jazz acoustics, after all].

We'll see how we get on, anyway: I'm under no pressure. That's the great thing about retirement: time. Time to do stuff went you want to do it, not when some dick manager says otherwise. If this modus operandi for panel construction proves fruitful acoustically, then I'll have a reliable and cheap method of constructing simple speaker cabinet designs: loft boards are stupidly inexpensive, and 10 9mm ply is eminently more affordable than the equivalent to the thickness of panel I can achieve through lamination; and the great thing is that the surfaces requiring machining have the physical characteristics needed for a clean and accurate finish: win-win, methinks. Keep you posted on progress...


Comments

Post a Comment

Popular posts from this blog

Of Feedback & Wobbles

-
Image
Many years ago I came up with an analogy for poorly damped feedback loops. The feedback loop that prompted this frankly tart analogy was indeed a horror. Anyone who remembers shame-faced their first attempts at clutch control resulting in the good old kangaroo launch across the lights only to stall in the middle of the crossroads will have some idea of the kind of data transfer lag involved in said system. The analogy I made was that of a large blancmange. Untouched, a model of stasis and eminently stable and predictable; but prod the bugger and the resultant chaotic behaviour needs a very complex physical model and some very decent computing horsepower to predict its outputs, if at all. The system in question was a large and complex audio-visual display at what eventually became 'The Electric Mountain' in Llanberis. We were ultimately contracted to maintain the thing having been witness to and peripherally involved in its installation. Certainly not involved in its des...
Read more

A Time of Connection

-
Image
I was just reflecting on the vacuum of continuity that's left behind when someone dies: that sudden sense of disjoint, of fracture, in one's personal history that takes one completely by surprise at the oddest moments. These pinch-points in memory can often yield some surprising revelations of fact about periods in one's past. One such occurred to me tonight, tending my rather lazy meal of pizza in its journey from shrink-wrap to mouth via the oven. Al's recent demise still catches me out from time to time: the space he left bounded by forty plus years of friendship. But the thing that struck me tonight was just how much change was happening on a personal and social level in the very early years of our acquaintance. Between moving here from Birmingham in September 1980 and our buying our first proper house eighteen months later, all manner of things occurred that would chart the course of our lives to the present day. At around the time of our meeting Alan & Irene [...
Read more

Sister Ray

-
Image
Ray Keats - aka Ann Key - local artist & family friend, died this morning. She'd been ill for some years, but never let it get in the way of her work or of tending to the massive network of friends, colleagues and fans she had accumulated over the decades. Her house on the High Street of Rachub, just below where we live - a former cockle factory(!) - bought many years ago when she and her late husband Ronald moved here from Manchester to set up home in Yr Achub, is currently still home to her paintings and drawings, and the front window displays her work, including the last drawing she made in hospital, just days before she died. Her good friend Colin has been a diamond in her latter years, looking out for her and just being there when she needed him. She will be much missed by this tiny community of ageing bohemians up here in the hills, but suffice it to say, George, her cat, will be well looked after now she's gone.
Read more