Re: [Harp-L] Re: Re:cupping.an odd effect (hazcon)



Ok i see what you mean Greg,it never occurred to me that the problem as such was air leaking along under the covers, only that the back pressure air was
coming out through the back of the harp.I take your point.Sneaky stuff that air.;-)


My next experiment is to build an airtight ridge on the combs and covers two faces to seal off holes 6 to 10 from the low(cupped) holes.
That will stop or at least ameliorate the effect that you outline below and coupled with tape over the back of the same holes should(might) give the same result as a pro's cup.
This harp will not be pretty ;-0
Now where did i put that bluetack
Rick
back in NZ


I am still puzzled about how totally sealing the back dosen't seem to affect the volume or timbre of a harmonica though
----- Original Message ----- From: "Greg Heumann" <greg@xxxxxxxxxxx>
To: <harp-l@xxxxxxxxxx>
Sent: Wednesday, May 20, 2009 12:01
Subject: [Harp-L] Re: Re:cupping.an odd effect (hazcon)



Rick, that is exactly my point. A good tight cup that seals the rear is NOT enough. YOU HAVE TO SEAL THE FRONT. The air goes into one hole, and then can flow back out, under the covers, back through all of the other reeds and out the front. The air moves too freely and we don't get the desired effect. Try this - cover holes 5-10 with tape on the front. Put the rest of the harp in your mouth. Cup it with your hands to seal the back side. Now blow. If you can blow or draw through all 4 holes, then put your tongue over the 1st 3 holes, bingo, you're tongue blocking and you get a single note. But even with the 4 hole chord you should hear a much bigger difference as you open and close your cup.

/Greg


From: "hazcon" <hazcon@xxxxxxxxxx>
Date: May 19, 2009 4:51:30 PM PDT
To: "Greg Heumann" <greg@xxxxxxxxxxx>, <harp-l@xxxxxxxxxx>
Subject: Re: [Harp-L] Re:cupping.an odd effect


When a similar thread popped up a while ago i did some experimenting.This was because i am a 100% puckerer so am unable to get that cheek block thing really going.
What i did was tape up the back of the harp with a sticky paper* postage label to completely seal off the back of the harp to sort of imitate someone doing a 'proper' cupping seal i.e. no air or back pressure being lost from the cup back through the high end holes.I had my doubts as to whether or not the harp would even work.
But what amazed me was that this made no discernable difference to the 'sound' of the harmonica at all in either volume or timbre!
With all the talk about comb materials,cover apertures etc here i am with a sealed off harp at the back and it sounds as close as dammit the same.
Now i'd have to admit that compared to some on the list i have probably got cloth ears but shouldn't something so radically counter intuitive be blaring noticeable?
So is this the 'poor mans 'way of achieving a good cup(it after all does prevent any back pressure leakage) or am i on a different planet.
* in case paper was too porous i got the same effect when i used that rubbery stretch duct tape, now that is airtight.



Rick on Mars
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