I-phone amp......2.1

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Project by jbschutz posted 144 days ago 1540 views 13 times favorited 9 comments Add to Favorites Watch

I-Phone amplifier….2.1 I had to try one more…..This is the single “speaker” version that allows the phone to be placed in the upright position or on its side. The open slots (see pictures) allow for sound transmission in either position, and the phone may be placed horizontally for charging hookup.
This one is made from walnut with accent strips of maple around the speaker (input) openings. I have included a sketch of the plan for the middle layer. The back piece is simply drilled with a succession of forstner bits to create a stepped cone at the back, and the projecting circular extension gives the “speaker” a bit more depth. A tapered foot at the back allows the stand to tilt back.
Middle and back layers are about 1/2 inch thick, and the circular extension is about 5/8 inch thick. Assembled with Titebond III and finished with spray poly.
This was a fun build, though routing out the channels from the back of the middle layer was a bit nerve wracking. To my ear, it works about as well as the two “speaker” model I posted earlier. Sound seems to be about doubled.

-- jbschutz

9 comments so far

View mcoyfrog's profile


3036 posts in 2221 days

#1 posted 144 days ago


-- Wood and Glass they kick (well you know) Have a great day - Dug

View mcoyfrog's profile


3036 posts in 2221 days

#2 posted 144 days ago

I just went back and looked at the 2 speaker/hole system you made they are both cool. It looks like there is a pinhole at the back of the speaker in this one is that true or a photo thing.

-- Wood and Glass they kick (well you know) Have a great day - Dug

View RogerBean's profile


1122 posts in 1580 days

#3 posted 144 days ago

Neat little doober. Nicely crafted. I like it.

-- "Everybody makes mistakes. A craftsman always fixes them." (Monty Kennedy, "The Checkering and Carving of Gunstocks", 1952)

View JL7's profile (online now)


7114 posts in 1592 days

#4 posted 144 days ago

That is really cool John, I like the mega-horn (mega-phone?) look!

-- Jeff - I have not failed. I've just found 10,002 ways that won't work.

View Sheisserick's profile


54 posts in 472 days

#5 posted 144 days ago

What would you say, you can deduct from the shape of the holes?
1 coned-out hole works as good as 2 flat-bottom holes?
I find it hard to hear much difference if it´s a song or some music, but the real test is making speech (Like audiobooks) come out clear. Did you test that yet?

I like your addition of the ring, which almost doubles the depth of your speaker.

-- I doubt, therefore I might be

View jbschutz's profile


386 posts in 1318 days

#6 posted 144 days ago

Response to questions.........I really can’t determine the overall differences, effectiveness, etc of v.1 versus 2. I wanted to try the single “speaker” form and be able to have the phone work while lying on its side, too. It does seem to work equally well in both positions. The flat bottomed pair against one coned “speaker” seems like a toss-up. A friend, who is into such electronics, wants to do some sophisticated tests on the input and output to really see if there is a way to optimize the performance. At this point, I think it is basically a megaphone effect….concentrating the sound and projecting it forward. If anyone has an interest…..check out the website. They sell several different forms of these passive amplifiers.

-- jbschutz

View NimbleJack's profile


9 posts in 1408 days

#7 posted 143 days ago

This is so much more elegant than what I have been using in the wood shop for the past year – a stainless mixing bowl from the kitchen. Drop your device in the bowl and rock on.

-- Jack - Olympia, Washington

View Roger's profile


14318 posts in 1431 days

#8 posted 142 days ago

This is the nicest ones of these I’ve seen. Very good.

-- Roger from KY. Work/Play/Travel Safe.

View Fishinbo's profile


11216 posts in 802 days

#9 posted 137 days ago

Totally cool project! Looks great and like the compact design. Great job!

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