Hot water bottle resonators

Also latex hot water bottles can be inflated as resonators.
A benefit of them is that they are of quite strong rubber and though can well be loaded with body weight, which is especially important in yoga exercises like the ekoChakra_padmassana.

What they also can do especially well is resonaKampaña; a variety of interesting drum sounds and other noises of many different timbres can be created on them; some of them sound much like an analogue synthesizer bass or even something almost cymbal- like (!). (Who the @!#?*! really needs a TR-909 for making tekkno? ;-) ) One of the most interesting qualities of hot water bottle resonators in resonaKampaña is that many of their extraordinary sound timbres are not only perceivable in their near- field, but (unlike most other resonators) even remain stabile audible at a distance - this makes of them also a perfect instrument for music therapeutical applications. Particularly well suited for resonaKampaña are ones of the Marigold brand, because these have extremely clear sounds of rich timbres those even function well already at quite low operating ranges.
To make hot water bottle resonators well usable, a bicycle tube valve should be mounted at the plug. To do this, its handle needs to be sawed off and instead a hole has to be drilled into the plastic plug, which should be that small that the valve just tightly fits into it and remains stuck after pressing it into the hole with the help of pliers. If the hole is too wide, hotglue can be used to mount the valve and seal the gaps. If the bottle has a metal plug instead (uncommon), the hole can alternatively be drilled into the plastic/ rubber board next to the plug (but sealing the gaps can be a bit more difficult in this case). 

For the valve an easy going type which needs little pressure to open should be chosen; though an ordinary airbed pump can be used to inflate the resonator and no awkward bicycle pump is needed.

To deflate this resonator later, the handleless plug doesn't need to be unscrewed; to insert an object (e.g. small screwdriver) into the valve is often less awkward. (Attention: With some valve sorts this trick doesn't work, though I recommend to test this before installing the valve. If you got no valves suitable for the trick it is not that bad - also unscrewing the plug can be performed relatively easy with most hot water bottles, although some bottle types need a little more force to seal well when closing them.)
These resonators are of quite strong and solid appearing rubber; despite the stability of hot water bottle resonators must not be overestimated. The bad side of hot water bottles is that most sorts especially don't like it at all to get over- inflated; the problem is not that much that their rubber itself would not be stretchable at all, but that most of them are very prone to drift problems by unequal load distribution, which leads to soon destruction by instabilities when they get operated in too high ranges.

Important is therefore to urgently prefer sorts with identical and smooth relief patterns on both sides, because every tiny variation in membrane thickness makes them more prone to drift problems and though limits their range of safe operation. It also seems to be important to buy ones of natural latex rubber. Synthetic rubber sorts (e.g. BuNa - often labelled with a "British patent" note) don't only smell bad, but apparently also have way worse hysteresis problems and are less stretchable.
This is a latex hot water bottle from Pirelli; they are one of the few companies those produce at least halfway suited ones for reliable resonators. (In spite of this I would not recommend to operate any resonators of this kind higher then in a medium 2nd range for a longer time.)

Some Eskimo hot water bottles seem to be identically with Pirelli. Unfortunately both sorts emit some petrol- like antiprana.

The best company for resonators of this kind seems to be Marigold (see here); they make hot water bottles from pure natural latex, those unlike others are free of any stinging chemical odours and have just a very mild latex smell. Marigold even makes ones with 2 equal sides, those are less prone to drift damages than the widespread asymmetrical designs. (I really love to meditate with this wonderful, well smelling, vibrant and energetic sort.)

Plastic hot water bottles (I tried a dark blue Fashy one) are badly suited for resonators; they are only little stretchable (even in a 3rd range barely more than needed to make their center area turn cylindrical) and have really bad vibration transmission properties those make them also of little use for resonaKampaña. (Sound is quiet and rather dull.) Their material is comparable with the plastic of sit balls and can be inflated quite hard (which causes noticeable hysteresis - inflating too much makes the seams turn leaky). I guess it may be a PVC sort, although at least this Fashy specimen is free of the typical dread chlorine/ plasticizer antiprana known from other soft PVC, but instead it has a quite mild, rather styrene- like smell, therefore possibly it may also be some kind of plasticized ABS plastic variant. (It is a pity that nobody makes hot water bottles of a non- toxic sort of transparent silicone rubber...)

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