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Hempopotamus Loudspeakers
Wayne County, OH, United States
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About This Listing

******************SEE MY OTHER LISTINGS!!!!!**************

 Up for grabs is this PAIR of 12" HEMP SPEAKER coaxially mounted hi-fi speakers.

These are made here in Ohio at PMR.EVERYTHING used is 100% AMERICAN MADE, right down to the adhesives, crossover components, and solder used..I'm the last guy who can state 100% AMERICAN MADE!
 This is a proto-type pair of a co-ax model that is going into production.

  'Gently used here at the shop, and reduced in cost, these will be a collectors item in no time..These are literally S.N.# 0001

 There are several similar type 'hemp' speakers, but these are real HEMPOPOTAMUS "Purple-Potamus" G5 hemp pulp recipe', which has the perfect blend of pulp, dampeners, binders, felt, fiber glass, kapok, and hemp . This is ONLY available here at PMR

 I'll start with the main drivers, the woofers.

 These are heavy/thick metal frame units, and have standard spade terminal connections.

 The magnetic assemblies are anisotropic ceramic composition, and very dense as far as gauss density.

.  Internally- Spider assemblies are a cupped profile, high compliance treated textile and keep everything centered.

They have a core which is 4140 alloy, and the cool thing about how they are vented is that they have a bore, which has the 1 3/8" TPI screw on driver female end at the rear. This fires into the core, which is hollowed out, and actually has an exponential expansion which creates the transition from the mouth to the throat of the horn..
 The compression horn expansion happens INSIDE of the woofers!
 hence- horn loading from a rear mounted screw on compression driver, without a front mounted wave guide which really craps up the sound..

 The voice coils in these are a TWO INCH diameter, and are a fine winding /light weight paper wrapped aluminum former.Mass is only a couple grams!

  This allows a fast 'pulse transition' from the windings of the coil  to the cone's neck area , and then into the cone body for quick impulse response.

 They are  8 ohms each, and in the 40-50 watt range.Windings are pure copper- none of that CCAW stuff, these are solid copper.

 Litz wires are a light weight .040" diameter to keep the moving mass low as possible.

 Dust caps are an acoustically transparent/open weave textile which allows the "tweeter" to fire directly through..
 That brings us to the star of the show- the G5 cones.

These cones are pure G5 pulp composition, and have the smoothest, easiest to listen to, most natural Earthy sound you'll ever lay your ears on. ........The sound is so tasty with these, your tongue will reach up and slap your brains out.They are purposely NOT repressed cones , just to get that kind of presentation.

 They have a straight profile, and a fully ribbed body. Many people think these ribs are stiffeners and are thicker at the rib pointsTrue, it probably does stiffen the cones into a true piston action,  but in actuality, these are engineered to decrease beaming (directivity), and increase dispersion angles as the frequency increases.

.......They are the same thickness the entire way up the cones profile, and are NOT thicker at the rib.
 This allows a wider sweet spot, and for you to stand up/sit down with as much the same perceived response as possible.

 Then, that brings us to the surrounds..You know how most all paper cones don't have good low end right?

 Welp, these have surrounds that have been specially treated with Eastman Kodak chemicals, in a manner that has been proprietarily developed here at PMR just to loosen up the fibers in that area ONLY, and thus increases compliance, increases excursion, and lowers the Fs which increases the low end response..
......You'll think you are listening to a half roll foam surround, but in actuality, have the fidelity of an all paper molded cone assembly.

 The front gaskets are actually real cork, so if you need an air tight gasket, well, it works MUCH better than those hard cardboard gaskets that everybody uses.

  That brings us to the high end.And- I'll go against a lot of what many of you have read and/or believe.. .. ..

 The compression drivers are actually PIEZO DRIVER elements!

  So, you ask  WTF amI doing using piezo elements in a system that sounds like this?

 Because you CAN make them sound GREAT! (I will swap out these for a 'conventional" driver if you want)

  There are a couple advantages to Rochelle salt crystal drivers, IF you know how to implement them.

  FIRST THING- Start with an AMERICAN made unit, not some E bay or import china POS driver.
 The beauty of these, is that they have a vacant rear chamber area..

 These were dis assembled, and that area was packed with long fiber fiberglass, to act as a dampener and also to absorb the rear pressure wave from the driver itself.

 The element itself is dampened  with the fiber glass, as well as these are dis assembled, and the edges of The driver were coated with ReZon-Ex..

 These are actually a small , almost massless paper cone tweeter which sound GREAT, once you do those tricks to them..
.......With the rear chamber absorbing the rear waves and the actual element and the cone dampened and treated , -these have a great response when you operate them at least an octave ABOVE their resonant frequency.

 Another thing to make these sound effortless, fast, nimble, and airy, is that the compression drivers are treated as if they are a standard resistive load.
......Unlike a moving coil tweeter, these have an impedance that remains very constant,ZERO inherent inductance,  as they have a fixed resistor(s) across their terminals, and THEN are treated as a load and crossed over with a 12dB/ octave crossover network..
.......Their slopes are steep, and well above their free air resonance, hence, a very usable and believable presentation out of a driver that is light weight.

  So, once you have a fast, quick, almost massless tweeter firing straight through the core of the main driver to create a true point source system, you have a set of speakers that approaches the realism of a pair of good headphones...
....Place these opposite of your ears in your listening room, and see if you don't agree..Place them in open baffle 'enclosures", and you'll have a super sounding effortless sounding system..

..  These speakers play lower-, they play higher than FM radio transmits.
  welp, that pretty much describes everything.
 use them in moderate sized sealed OR vented enclosures..  use them in OB systems...  Add a subwoofer, and it'll blow your gourd.
  * Fully tested under diagnostics and operate without any rubbing, buzzing, holes, rips, tears, rot, or adhesive failures, these operate just peachy.
  *I'm confident enough that you will love what you bought that Iam including my 15 day "NO GAMBLE" return option from delivery date (((less customer damage))) if for ANY REASON you don't like them or you dis-agree with ANY of this.. - just that simple..
  So, if you want a pair of coax 12" 2 way HEMP SPERAKERS, then here ya' go!
 ANY questions or concerns- just ask.

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Product Specs

ConditionBrand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.learn more
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