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Corrugated Cardboard Bookshelf Speaker Project
Corrugated Cardboard Bookshelf Speaker Project
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Old 13th February 2018, 01:29 PM   #31
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Join Date: Jan 2015
Location: Near Colombo
Default Better with TEA2025 2 W per channel

Better with the TEA2025, adequate power, full volume was not needed. Should be better after complete sealing and internal damping as well as adding extra panels to the inside.

Picture of 2025 board from an earlier post:
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File Type: jpg Tea2025Board.jpg (142.7 KB, 223 views)
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Old 19th February 2018, 12:11 PM   #32
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Latest testing showed some distortion at all levels, 60 -70 dB sound levels. I will be going for a crossover after all, common crossover frequency is 4000 Hz though I remember from earlier testing years ago I settled at a 470 uF capacitor for the best sound. This site suggests

Capacitors
C1 = 9.94 uF
Inductors
L1 = 0.16 mH
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Old 26th February 2018, 09:12 AM   #33
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Join Date: Jan 2015
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In order to make a coil with the required inductance as given by this site:

Coil Inductance Calculator - Electrical Engineering & Electronics Tools

Number of turns: 35
Loop Diameter : 40 mm
Wire diameter (26 gauge): 0.254
Relative Permeability (copper) : 1

Permeability

Inductance: 0.000158H

I need about 8 meters of copper wire costing about USD 0.80

I need to strip the insulation off the ends first I had a time figuring why the copper wire was not conducting current!

Last edited by BasicHIFI1; 26th February 2018 at 09:13 AM. Reason: Permeability link
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Old 26th February 2018, 10:25 AM   #34
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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I will be adding a port. This site Car Audio - PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES gives a port length for a 2 inch wide port to be 3.91 inches for a 77 Hz resonance. Box volume is estimated at 0.266 cubic feet.

77 Hz should land it in the bass and drum range.

Last edited by BasicHIFI1; 26th February 2018 at 10:27 AM. Reason: bass and drum range
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Old 3rd March 2018, 03:44 AM   #35
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Join Date: Jan 2015
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Some listening last night to digital streaming audio (Yonder.com) revealed the speakers were sounding quite pleasant with good quality audio. I really enjoyed "Beneath the Mask" , the clarity was there, possibly due to the crossoverless, full range set up with a port.

Time to complete the other speaker and finish the thing.

Next time I start with an adequate setup for bass.

I leave you with some links to images of cardboard speakers others have built.

Monitor speakers by Mitch Shivers at Coroflot.com
YouTube
YouTube
http://charlest.zenfolio.com/img/v1/p572989259-4.jpg
https://www.juanmatoscapote.net/
http://audiokarma.org/forums/index.p....563852/page-2
https://randomoverload.org/cardboard-speakers

Last edited by BasicHIFI1; 3rd March 2018 at 04:10 AM.
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Old 3rd March 2018, 04:17 AM   #36
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Join Date: Jan 2015
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Also a video showing good construction methods using a glue gun and several layers.
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Old 7th March 2018, 09:12 AM   #37
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Default Completed

The speaker has been completed, painted with black paint on the front panel, and covered with black paper on the sides. Ordinary poster color like paint was used.

It sounds good sometimes, sometimes distorted, which has to do with the speaker wires and tiny USB amplifier. All in all, I have had some very good listening sessions and have heard musical sounds never heard before on tracks I have heard before.

Completing the other side.
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File Type: png piaintedspkr.png (318.9 KB, 121 views)
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Old 10th March 2018, 02:09 AM   #38
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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How do they sound? With streaming audio from a subscription service, (Yonder, iTunes, Wynk..) they sound good. On the Linkwitz scale:

I had a great listening session yesterday, very enjoyable, especially light rock.

linkwUntitled.png

Last edited by BasicHIFI1; 10th March 2018 at 02:29 AM.
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Old 11th March 2018, 10:09 AM   #39
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Join Date: Jan 2015
Location: Near Colombo
Default Audio Test Android Applications analysis

Not sure how accurate this is, however it shows the response of the speaker to the test signal send from the phone over the speakers and recorded by the phone mic.
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File Type: jpg auditest.jpg (224.3 KB, 85 views)
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Old 3rd April 2018, 06:26 AM   #40
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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One problem with these speakers, not a problem with the speakers themselves actually, is that different recordings require different tone settings to play back with the correct tonal balance, and tone controls I do not have. For example Peter Gabriel's "SO" comes across nicely but Sade's "Promise" (both CDs) even though it is a CD, sounds a little more subdued.

One option then is to make the speakers a little bright to compensate for the varied recordings and to use tone controls.

The other option is to go two-way: testing with a tweeter showed much better reproduction of highs, needs toning down a bit, but two way seems the way to go, at least at my budget levels.
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