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Peerless 3" computer speakers
Peerless 3" computer speakers
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Old 13th February 2018, 06:30 PM   #11
planet10 is offline planet10  Canada
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Peerless 3" computer speakers
This driver has a high Q so you will get a bump in the bass even in an infinite baffle. The way to deal with that is usually an OB, where the leakage around the sides counters the rise (but the large size needed is impractical) or an aperiodic enclosure where an attempt is made to damp the peak.

Certainly a vented box is not a good idea.

Start with the largest sealed box you can live with. You might like the bump, but if you find the underdamped response not to your liking you can start drilling some holes in the back and damp those holes. This is very much a cut and try process so go slowly. You can use GMs clik test or measure for maximally flat impedance curve. Or just listen.

EQ is the other option, but i dont think as effectove as an acoustic fix.

This is a picture of one of the most well developed aperiodic speakers i know of. It gives some indication of the approach.

Click the image to open in full size.

dave
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Old 14th February 2018, 09:53 PM   #12
Bjohannesen is offline Bjohannesen  Denmark
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This driver will do very well in TABAQ. The folded version could be used as desktop speaker. Put it upside down with the opening downwards using some small feets on the enclosure.


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Old 15th February 2018, 12:28 PM   #13
champ222 is offline champ222  England
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So i did some listening last night. i found some cardboard boxes (i know) that were similar in size to what i was looking at, a bit deeper though and due to the fact that its cardboard, the volume is bigger, about 3.8 litres ish.

They sounded pretty nice. not a lot of low end, as expected, but plenty of detail, and nice to listen to at low levels. worth persisting with.

The TABAQ looks like a floor standing design? unless there is another version? I'll do some research...

thanks
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Old 15th February 2018, 12:31 PM   #14
mikejennens is offline mikejennens  United States
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Peerless 3" computer speakers
Here is the folded version of the TABAQ

http://www.coolcat.dk/bjoern/TABAQ%2...et%20build.pdf
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Old 15th February 2018, 02:37 PM   #15
champ222 is offline champ222  England
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Thanks

Its still a bit bigger than i'm looking for though, can i make it smaller?
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Old 15th February 2018, 02:48 PM   #16
mikejennens is offline mikejennens  United States
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Peerless 3" computer speakers
Quote:
Originally Posted by champ222 View Post
Thanks

Its still a bit bigger than i'm looking for though, can i make it smaller?
I don't believe it can be changed and still be optimum.
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Old 15th February 2018, 03:10 PM   #17
champ222 is offline champ222  England
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i thought that may be the case. I'm going to try some various port lengths over the next few days.
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Old 15th February 2018, 03:21 PM   #18
gfiandy is offline gfiandy  United Kingdom
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I did a simulation of the speaker in a 0.1Cft (2.8L) box with baffle step and diffraction. If you are close to a wall then it will fill the bass back in a bit. The baffles step more than compensates for the peak in the response in a 2.8L box. but it means the mid will be elevated reference the bass by approx. 5dB.


I will see if I can work out a simple correction filter.
Attached Images
File Type: jpg Peerless 3.5.JPG (203.6 KB, 140 views)
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Old 15th February 2018, 03:48 PM   #19
gfiandy is offline gfiandy  United Kingdom
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This is a fully compensated design if place close to a wall the bass might be a bit much.


I have taken the box and baffle simulation merged them with the responses from the data sheet to provide simulated in box measurements and then applied a correction network made up of a bass shelf with a resistive component to level if out followed by a capacitive resistive element to lift the response back up after the baffle diffraction hump.


Below are the uncorrected merged data, the filtered corrected response and the filter components.
Attached Images
File Type: png no correction merged.PNG (227.2 KB, 135 views)
File Type: png corrected.PNG (220.1 KB, 114 views)
File Type: png xover.PNG (1.9 KB, 140 views)
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Old 16th February 2018, 10:31 PM   #20
champ222 is offline champ222  England
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Wow, thanks for all your efforts guys, I'll see if I can find those components and try it out. This is for a sealed 2.8 litre enclosure Yeah?

Thanks again.
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