Helium - a true micromonitor

[Herman Trivilino]

Re: Helium - a true micromonitor

All of my parts are in! I have a silly question about the port. Can I get 3/4 ID PVC and cut it at a 45 deg angle and glue the pieces together? Alternatively could I use 3/4" copper pipe?

If you make the cuts with a chop saw or a table saw so that they're smooth and use the right glue you could probably get away with it. It's much easier, though, to use an elbow.

You could instead use copper or anything you like. Even a cardboard tube.

[corradizo]

Re: Helium - a true micromonitor

Thanks Herman, trying to save space in the box :-). I will pick up and elbow at the store and just see how it goes. Let the dust fly!

[scottsehlin]

Re: Helium - a true micromonitor

For my Hafnium project, I actually did exactly what you describe - cut a 45 degree angle in PVC and glued the resulting two pieces together with PVC glue to make the port. I used a compound miter saw to make the cut. For my Helium prototype, I used a standard elbow.

[scottsehlin]

Re: Helium - a true micromonitor

You can see the port on post 19 of the Hafnium thread.

[Herman Trivilino]

Re: Helium - a true micromonitor

Thanks Herman, trying to save space in the box :-). I will pick up and elbow at the store and just see how it goes. Let the dust fly!

I didn't glue mine, friction alone holds the elbow on.

[corradizo]

Re: Helium - a true micromonitor

Assembled! Need to glue them up and paint.. Note, the tape doesn't hold for much. A little bit of power and Hotel California blew the baffle off!! They already sound big, way bigger than you would guess and very clear. I series connected a 27 and 12ohm resistors to get to 39ohm and tried it on one. It seems to make them more "alive"? I like it better, though I do not have a trained ear. Thanks so much for this great design in such a small package!! My first non-sub speakers rock!!

[Misch]

Re: Helium - a true micromonitor

I've got a couple of blown ND90 with the magnet removed. Could they be used as a passive radiator? WinIsd sim would require adding 6 grams to get the same response curve (using published specs). Anything I'm missing?

[scottsehlin]

Re: Helium - a true micromonitor

Good news for prospective Helium builders! PE is now offering a full range speaker starter kit that includes the ND91-4 and the knock down enclosure kit for approx $70, which is $12 less than buying separately (part number 300-7100). Add the tweeters and crossover parts, and you can have Heliums.

[scottsehlin]

Re: Helium - a true micromonitor

I've got a couple of blown ND90 with the magnet removed. Could they be used as a passive radiator? WinIsd sim would require adding 6 grams to get the same response curve (using published specs). Anything I'm missing?

That seems like it should work as long as everything moves freely. You might try to find some lead tape (golf and/or tennis shop should have it) to add the weight.

[thekorvers]

Re: Helium - a true micromonitor

Good news for prospective Helium builders! PE is now offering a full range speaker starter kit that includes the ND91-4 and the knock down enclosure kit for approx $70, which is $12 less than buying separately (part number 300-7100). Add the tweeters and crossover parts, and you can have Heliums.

Link?

Edit: Never mind. Got it. Overlooked the part # in your post.

[corradizo]

Re: Helium - a true micromonitor

That's awesome, they sound so nice!!

I am thinking to try the Overnight Sensations next. Cannot think of a better gift to give to a friend.

Thanks again!

[bkeane1259]

Re: Helium - a true micromonitor

Good news for prospective Helium builders! PE is now offering a full range speaker starter kit that includes the ND91-4 and the knock down enclosure kit for approx $70, which is $12 less than buying separately (part number 300-7100). Add the tweeters and crossover parts, and you can have Heliums.

Wow....not too shabby!!!

Here's the link: http://www.parts-express.com/dayton-...encl--300-7100

[Herman Trivilino]

Re: Helium - a true micromonitor

Good news for prospective Helium builders! PE is now offering a full range speaker starter kit that includes the ND91-4 and the knock down enclosure kit for approx $70, which is $12 less than buying separately (part number 300-7100). Add the tweeters and crossover parts, and you can have Heliums.

PE should mention this in the product description as a better-sounding alternative to the less-expensive full range option. Make it a one-click purchase option.

[bolland83]

Re: Helium - a true micromonitor

I'm so tempted to get parts for these, I already have some ND91's in small ported cabs out in the garage, I'm half way finished already, lol.

[bkeane1259]

Re: Helium - a true micromonitor

PE should mention this in the product description as a better-sounding alternative to the less-expensive full range option. Make it a one-click purchase option.

Herman, can you check your inbox please? Thanks.