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[Articles Home]  [Add Article]  

A Can, Can Sound Much Better!

from Frank Fowsky, NY7NY on July 14, 2019
View comments about this article!

A Can, Can Sound Much Better!

Radio makers usually employ an upward firing speaker - why?
Its mounting placement is much more flexible - all that top cab space is cheap real estate.
An upward directed speaker puts the sound dispersion pattern out of range of the receptor, i.e., your ear. A loudspeaker's frequency range, outside of its directed dispersion angle, is not balanced. The high frequency sound waves emanating from the center cone do not reach you.

A Can, Can Do - increase dynamic range for free!

-Provides a Horn-like focus
-Directable towards your seated position
-Thin material provides quick response
-Circular structure aids in rigidity
-Great reflectivity - uniform surface, smooth, no texture - leave uncoated
-Place in contact as pictured or, elevate and direct towards you
-Mounting options - PVC, Lucite, or cut up another can

Assembly instructions: Just lay an aluminum can across the speaker opening, the can reflects high frequency audio off of its curved side. Fine tune by turning the can to direct the sound towards you.

In my application [see photo], the empty can* balances on the MFJ QRP XCVR's rear 2x protruding speaker mounting screw heads.

* Avoid danger and use an empty, throughly dry, can!

Cheap fix, test it yourself and share your results.

Possibilities to improve this mod includes: cans formed into horn, parabolic reflector/director, circular, vertical, spiral dispersion patterns or, try a stepped time delay reflector.

This simple can placement has also been used to improve the sound of the Tivoli (Henry Kloss) table radio.

Thanks for your time.

Member Comments:
Add A Comment
 
A Can, Can Sound Much Better! Reply
by SWMAN on July 14, 2019 Mail this to a friend!
Great idea and it works great also. I came up with the same idea several years ago but instead of using a can I use one of the small clear plexiglass photo holders that you can buy at the dollar store. just set it on top of the radio, works great. The can thingy is a good idea also. Thanks Jim
 
A Can, Can Sound Much Better! Reply
by K4TIN on July 14, 2019 Mail this to a friend!
Worth a try. Materials are cheap enough!
 
RE: A Can, Can Sound Much Better! Reply
by F8WBD on July 14, 2019 Mail this to a friend!
I have a couple cans of suds in the fridge. With two, I'll have stereo.
 
Reported results can be subjective... Reply
by ON4AA on July 14, 2019 Mail this to a friend!
Reported results can be subjective...
...depending on what was in the can in the first place!
 
MFJ Reply
by ON4AA on July 14, 2019 Mail this to a friend!
Junk with junk, nice combination! ;-)
 
RE: A Can, Can Sound Much Better! Reply
by KC3JV on July 14, 2019 Mail this to a friend!
I don't understand how the can is configured? How about a diagram?

Mark KC3JV
 
A Can, Can Sound Much Better! Reply
by W6HB on July 14, 2019 Mail this to a friend!
Having a problem operating in a noisy communications center on the Battleship IOWA I either use headphones or a 3" or 4" PVC elbow from Home Depot placed over the rig's speaker directed at myself. Your mileage may vary.....
 
A Can, Can Sound Much Better! Reply
by KG5AHC on July 15, 2019 Mail this to a friend!
very cool, thanks for posting the idea.
 
A Can, Can Sound Much Better! Reply
by VE3WGO on July 15, 2019 Mail this to a friend!
thanks for the idea NY7NY.

So far, I had been using an old Handbook on top of my radio just behind the speaker opening to achieve a similar effect, but I think the can can be more reflective and work even better.

73, Ed
 
A Can, Can Sound Much Better! Reply
by K8QV on July 15, 2019 Mail this to a friend!
For more than 60 years I have been enhancing the sound from cheap, ill placed speakers in transistor radios and such with soup cans, oatmeal boxes and toilet paper cores.
 
Sound Much Better for $6 Reply
by K1GUY on July 15, 2019 Mail this to a friend!
another way to do it...try this link

https://www.ebay.com/itm/3-inch-45-Degree-Silicone-Hose-Tubro-Intake-Intercooler-Pipe-Coupler-Black/301786069269?_trkparms=ispr%3D1&hash=item4643d9f915:g:jYYAAOSw7ehXQprX&enc=AQADAAAB4KX%2FKt4E1xf3SDqEdBclaYZGVk1F5BQFDGV5q6fBlgIhPyfunZx159BiOgnO4vi5gpnL7bcgyZLb%2Bu6Hsf6MDVjN9cxoYbprxO6MqO4Te8anrHpTh%2BjdkfsomBU1zOKwfjiISnvcOt6IyKGcaxO5tVREMRetgepPzwKpvO%2BlKqq09xY%2F9Qpl5r8ZKWJpIMiaLpBep4XX7004q935PKdz93GYtGDBKiB9HKsAzHBQ57EW1X9c1GimfPsvfCE69yMyho29%2FLQVTzlU0cCZmiO49mSiYnzjgssNm4Pmo7dBanog11hsldzpocGo2P2NY7dkdIeGbB3SDI9v%2Fz550CuIof4Mi5szQyFO0IVK3IE08IX2dfcUOQHXjYPhCOej%2FHr9L3iujB7MF4dsj5k%2FD3HuOplash%2FEXtMPRlKq7Uimza4oIPcZ%2BMZgPX%2Fz9efEkfwFIcPpk8JgL60neIP%2F4DUhYwB4VBfU4oQ8cxcOUI20VaVmkcs%2F9tnCLc%2Bv0JPHER9UJWzWjvWOAZrOzZKO4v6zFoauN6IB%2Bb6yHsr3lz7W6LTQoRCttNSQ4OA2%2FPnu%2FWrEcxxA6%2B0DEjBCORdILzl84dcZNMYr2demfAjdRnhgz9n7fD%2BSnRb3HXE7GIISw2HrtA%3D%3D&checksum=3017860692694aa0627534ba4325ae80aed92bb730b5
 
A Can, Can Sound Much Better! Reply
by K1CJS on July 15, 2019 Mail this to a friend!
I used to use half a cardboard oatmeal tube with a 'port' cut into it facing me. Better yet, a communications speaker made for vocal frequencies such as from a GE or Motorola mobile radio. They often can be had for a few dollars on E-bay.

Thanks for the food for thought in any case.
 
A Can, Can Sound Much Better! Reply
by WD4IGX on July 16, 2019 Mail this to a friend!
I've tried two different browsers and don't see the photo.
 
A Can, Can Sound Much Better! Reply
by KK6BXO on July 16, 2019 Mail this to a friend!
Thanks Frank. Paul W Klipsch would have loved it!
 
A Can, Can Sound Much Better! Reply
by VE3KKQ on July 16, 2019 Mail this to a friend!
Some time ago, there was an article about using a CB radio PA horn speaker for CW reception.
 
A Can, Can Sound Much Better! Reply
by K9MHZ on July 17, 2019 Mail this to a friend!
"Better yet, a communications speaker made for vocal frequencies such as from a GE or Motorola mobile radio."

Really good point. Have the GE Orion setup for 33cm, and have found their external speakers to be excellent, and built like tanks. Lots of them are NOS on eBay for a few bucks.
 
A Can, Can Sound Much Better! Reply
by N4LQ on July 17, 2019 Mail this to a friend!
I don't see any pictures or drawings. Perhaps this link will shed some light on the subject....https://www.youtube.com/watch?v=Ha1nOo2KXJE
 
A Can, Can Sound Much Better! Reply
by KW6LA on July 18, 2019 Mail this to a friend!
like the article and I own that radio. Actually enjoy operating it too. Soon I put an audio jack for a speaker that sounded better.Tried my old Motorola Motrac and It was LOUD by design!! Some like loud, I like better, so the can would not be something I would do. Years ago I decided radios don't have to sound like 1959. I do understand your point about noisy conditions, but a can
will change the frequency response in a negative way. DX
audio can be a difficult,-- thru a can speaker,, you have a contest! Thank you for posting.
 
A Can, Can Sound Much Better! Reply
by KH2BR on July 19, 2019 Mail this to a friend!
Works great. Thanks.. Now, we need to make handi talkies sound great on the air instead of sounding like junk.
 
A Can, Can Sound Much Better! Reply
by W5GNB on July 20, 2019 Mail this to a friend!
Sort of a replay of using a Prince Albert tobacco can on the old Railroad sounders ... It worked GREAT !!! LOL !!
 
RE: A Can, Can Sound Much Better! Reply
by G3SEA on July 23, 2019 Mail this to a friend!

Now THAT'S a creative and simple idea in the true Ham tradition :)

G3SEA/KH6
 
A Can, Can Sound Much Better! Reply
by KB4MNG on July 29, 2019 Mail this to a friend!
Kinda like a resonant speaker. Go on you tube and put together a pvc resonant speaker. You will be glad you did.kb4mng
 
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