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Foam Core Board Speaker Enclosures?
Foam Core Board Speaker Enclosures?
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Old 21st November 2014, 10:10 PM   #2511
BP1Fanatic is offline BP1Fanatic  United States
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Nice! I can't believe you've only built foamcore speakers!
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Old 23rd November 2014, 12:23 AM   #2512
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
Quote:
Originally Posted by BP1Fanatic View Post
Nice! I can't believe you've only built foamcore speakers!
Don't forget cardboard and XPS foam sheathing.

Anything that cuts with a razor blade.

One day I hope to have a workshop with a table saw.
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Old 23rd November 2014, 12:28 AM   #2513
Soldermizer is offline Soldermizer  United States
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There is some tough material out there...while I don't suggest building an enclosure from it, I recently bought an on-sale pumpkin ($2.49 at Target) with the idea of eating it (also have a cat and a guinea pig that eat the canned stuff). This "decorative pumpkin" resisted even a kitchen knife, so I got out my trusty electric jigsaw and sliced it up
Thank heavens I have divorced women friends to ask for advice: 350 F for one hour and it's quite tasty. Odd: the pets won't eat the fresh or cooked product.

I relent: you probably could make a decent enclosure out of a pumpkin but I'm not sure about the life span. Would be an excellent outdoor speaker for Halloween sound effects
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Old 25th November 2014, 01:36 PM   #2514
BP1Fanatic is offline BP1Fanatic  United States
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LOL!
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Old 27th November 2014, 08:04 PM   #2515
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
Quote:
Originally Posted by xrk971 View Post
Here is my latest foam core speaker. More details here:
Hypercube Loudspeakers

Click the image to open in full size.

A very easy and fast speaker to make. Sounds great and would be an excellent satellite for a HT or a FAST.

Here is the measured response without any stuffing:

Click the image to open in full size.
Some sound clips with this speaker running fullrange and a sub with a passive line level XO (PLLXO) at about 200Hz. There is no EQ or any DSP, source straight from CD player to TPA3116D2 amp for Hypercubes and Yamaha RX360 amp for subs via PLLXO.

More info on PLLXO here:
sub crossover design on a college budget. help please.

Photo of sub XO high pass filter -12dB/oct at 200Hz:
Click the image to open in full size.

The speaker has radiated emission from the walls of the housing, as seen here in measurements. This contributes to some ambiance and a sense of a larger soundstage:
Click the image to open in full size.

Here are the polar measurements:
Click the image to open in full size.

Here is the on-axis Impulse:
Click the image to open in full size.

Here is the stereo setup: (for listening and measurements they were placed on stands):
Click the image to open in full size.

Sound clips are below in attached zip files.
Attached Files
File Type: zip Hypercube-TC9FD-PLLXO-Sub-01.zip (955.0 KB, 43 views)
File Type: zip Hypercube-TC9FD-PLLXO-Sub-02.zip (970.9 KB, 30 views)
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Old 27th November 2014, 08:08 PM   #2516
Buehgemeiste is offline Buehgemeiste
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This thread is pure gold.
Congratulations on all those successful builds and on the discovery of this building method.
The TC9FD seems to be THE bang for the bug fullranger.

Im sure it is somewhere hidden i this thread, but what material thickness of the foam core board is used for those cabinets?
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Old 27th November 2014, 08:18 PM   #2517
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
Quote:
Originally Posted by Buehgemeiste View Post
This thread is pure gold.
Congratulations on all those successful builds and on the discovery of this building method.
The TC9FD seems to be THE bang for the bug fullranger.

Im sure it is somewhere hidden i this thread, but what material thickness of the foam core board is used for those cabinets?
Hey thanks for the kind words Buehegemeiste.

The TC9FD is one of the best sounding drivers at any price. The foam core that is sold in the US comes in a standard 3/16in thickness (0.1875in). The dollar store variety is very light and brittle with thin paper. The Elmer's brand is much stiffer and stronger at 5x the price. There is really thick 1/2in and 3/4in stuff available for industrial signs but that stuff costs more than plywood.
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Old 27th November 2014, 08:30 PM   #2518
Buehgemeiste is offline Buehgemeiste
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...foam core from the dollar store...
that definitely proves:

dollar store > euro store

euro store only sells plastic flowers, lighters and toys that all children hate.
i'll make out a cheap source of foam core board and reproduce some of your creations.
i was thinking about a pair of TL9FD's for the needles.
but those mltl's seem to be an even better reason.
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Old 27th November 2014, 08:32 PM   #2519
xrk971 is offline xrk971  United States
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The 0.4x scale Karlsonator is an easy to do great sounding first project. Lots of satisfied builds on that one.
Mini Karlsonator (0.53X) with Dual TC9FD's
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Old 27th November 2014, 08:37 PM   #2520
Buehgemeiste is offline Buehgemeiste
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A TC9FD costs 14€ in germany atm.
If somebody is looking for a nice christmas present:
A pair of those would make me a happy presentee.
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