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Old 6th January 2011, 03:43 AM   #671
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Quote:
Originally Posted by tommy_o View Post
... was wondering if anyone uses CAT5 wiring as speaker cables...
A pair of single strands.

dave
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Old 6th January 2011, 05:43 AM   #672
_henry_ is offline _henry_  Australia
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should try it, as its dirt cheap

i've used single solid 18awg for my alpair5 and 10, works well.

cheers
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Old 6th January 2011, 02:15 PM   #673
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Quote:
Originally Posted by jwmbro View Post
Hey guys, just built these:

Click the image to open in full size.

Click the image to open in full size.

Here they are taped up with masking tape, to try to get an idea how much stuffing is necessary:

Click the image to open in full size.

Once I make a finalized decision on the stuffing, and glue on the side wall, I'm going to add on a proper baffle to the front, so that the driver will be flush mounted, and so the grain of the plywood is covered up (and to add a roundover).

So far I'm pretty happy with what they can do at such a low price, and small form factor.

I will be using them as desktop computer speakers. So far I'm quite pleased, but I'm reserving final judgment for when I'm done. Very easy build (one evening's work).
Nice! Those look great! What are you going to be using to power them?

Scott
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Old 6th January 2011, 03:37 PM   #674
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I use cheap(ish) 5 gauge wire designed for power car audio amps to hook up my speakers after doing high power testing of small transformers (10A -15A currents) and looking though a thermal camera and seeing 30c temperature rises in the wires that were about the thickness of normal cheap speaker cable (fractions of a mm). The wire says silly things on it and has 'directional' markings but is very substantial. Stuff like this:
4 AWG GAUGE 23 FEET RED POWER GROUND AMP WIRE AMPLIFIER on eBay (end time 06-Jan-11 19:22:00 GMT)
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Old 7th January 2011, 10:18 PM   #675
jwmbro is offline jwmbro  United States
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Quote:
Originally Posted by skeeter99 View Post
Nice! Those look great! What are you going to be using to power them?

Scott
Thanks!
I'm powering them with a Tripath TA2024 based Class-D amp by Dayton. Perfect for desktop volume without taking up desktop space.

I glued up the speakers today, and put a 6.5mm thick suprabaffle on the front, covering up the endgrain of the side walls, and making the driver flush mounted.

Added some roundovers and I'm good to go. All I have left to do is paint it with a clear coat, since the birch finish nicely matches my birch veneered desk already.

Click the image to open in full size.

Not perfect routing, but good enough for me:

Click the image to open in full size.

Some endgrain on the back:

Click the image to open in full size.

Imaging on these things is pretty nice, I have them setup slightly wider than the typical 60degree stereo triangle, on some songs it sounds like instruments are coming from behind the speakers, that's quite startling.


These are folded transmission lines, for which I adapted the plans from plans available on planet10's site, but I can't for the life of me find the original plans anymore.

In anycase, pretty good speakers for 50 bucks a pop.
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Old 7th January 2011, 11:28 PM   #676
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Originally Posted by jwmbro View Post
These are folded transmission lines, for which I adapted the plans from plans available on planet10's site, but I can't for the life of me find the original plans anymore.
Reminds me that i need to get the folded halfTower plans into the microTower plans (or as an appendix). Only links to the plans are in this earlier post.

dave
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Old 8th January 2011, 01:43 AM   #677
jwmbro is offline jwmbro  United States
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Originally Posted by planet10 View Post
Reminds me that i need to get the folded halfTower plans into the microTower plans (or as an appendix). Only links to the plans are in this earlier post.

dave
Okay, I found the original post (even though the link doesn't work - probably because we have a different posts per page setting).

Quote:
Originally Posted by planet10 View Post
Skinny folded halfTower with front exiting terminus.

Click the image to open in full size.

folded halfTower 0v8 map

Someone build it and report back.
OK, here's James in Bavaria reporting back:

The speakers I built were adapted somewhat by myself. I tried to stay fairly true to the original, comparing differences in HornResp (not an accurate sim, but it shows how much changing a dimension changes the response). Here's a Sketchup of the actual model I built:
Click the image to open in full size.
Click the image to open in full size.

It's 12mm birch ply, with a 6.5mm thick baffle on the front (in addition to the 12mm thick front wall already in place, meaning total 18.5mm baffle)

For the port divider I used two pieces of 10x30mm pine wood glued together, and sawed to length.

Here are the exact dimensions:
Click the image to open in full size.
Click the image to open in full size.

I'm pretty sure these dimensions are unambiguous and complete, considering they were all I had to use when I built the speakers, having lost the original plans.

Perhaps if anyone would be so kind, they could model my speaker with the appropriate worksheets, to see what kind of output I should be expecting.

As for what kind of output I get? They hit pretty hard all the way down into the 40s, before rolling off. Plenty loud for the ~60cm distance I have from ear to speaker, I'm very happy with them as desktop speakers.
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Last edited by jwmbro; 8th January 2011 at 01:48 AM.
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Old 26th January 2011, 10:04 AM   #678
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Default What about a caste style TQWT ?

This Could perform very well.
I think bass augumentation is 1-2 db more than in original mltl.

Are there any disadvantages using a TQWT compared to MLTL?


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

looks very promising to me.
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Old 26th January 2011, 10:34 PM   #679
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My clones of the black beauty design (page11) are finished apart from baffle step corection circuit which I am currently doing using EQ in software. I changed the external dimensions to 15x15x30cm with an 18mm baffle and 12mm sides. I also added an internal brace and plan on some changes to the baffle step circuit for my particularly close to wall situation.

I am very impresed by the frequancy range these speakers are capable of, bass exstension seems the same as my previous mission 760i's (about 80Hz). Imaging is superb especialy at close listening distances where two ways just wern't working corectly. They are also alot less 'boomy' than my previous speakers I presume due to the low group delay over the pass band compared with a ported design. Anyway I will do some actual mesurments at a latter date. Max volume is limited before distortion but more than loud enough for bedroom usage.

Burn in time for the CHR-70 I found to be about 10hrs, sound was very harsh and lacking in bass slightly to start with but I left them running for a day and came back and all was well.

apologies for the poor picture quality I only have a mobile phone (poor student). Many thanks to Henkjan for showing the capacitor equalised undersized boxes work well with this driver!
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Old 27th January 2011, 06:00 PM   #680
Nanook is offline Nanook  Canada
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Default the beauties...

Kipman, what a clean desk! How do you do it? I can't even see the surface of mine!

I guess I need to look at this thread more often
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