Nameless 2-way speaker build - Page 2

Are you sure? It looks like you've entered .025 mm.

That's odd that it would be meters.

Very true. I had to do the traces dozens of times to get it to trace properly. In the end I had to do 2 separate traces, then merge the numbers of both into a single file by converting it to a text file. It was a pain but it worked.

Don't worry about DCR. It will not make any difference in your project. I prefer air core, but the one I looked up was $10 or so, so if you can save significantly compared to that, then it may be acceptable. For low power, I don't think it matters if you use an iron core.

Thanks for the thread. Great learning for us rookies.
Question about your enclosure: did you switch out to a Parts Express cabinet? The picture of the front baffle looks like one of the PE cabinets.

I care

Could you Gate the measurements out to about 3 ms? That will atleast give you 700Hz and beyond without room interaction. Also set the smoothing to 1/6th.

Tux, that is an interesting graph, did you buy a program to measure the reponse of the speakers you built?

Cool, I looked at your post, and it would be interesting to "see" what my speakers sound like!

The HTPC I have in that room doesn't have a sound card, everything is on the mobo (currently using SP/DIF out) to the AVR. I do however have a Diamond Extreme 7.1/24 bit Sound Card that could be installed if need be...

I found threads by lilmike on speaker builds, was there a thread on holm specifically?

I'll dig further for the thread, is that the mic you have? Will the extra one you mentioned work?

Yep, I have a laptop, and ther HTPC has a mic in as well.

Agreed it would be good to test them in the actual room, and yes those subs too! It would be interesting to see the response in there now as opposed to with the 'new' speakers.

The gating looks good for use in x-over work. I usually have mine at 500 hz, but sometimes, depending on how I set my speakers up to measure, I can go lower. You will get the same results as far as the x-over goes, only maybe a little more detail down lower in frequency. When you measured, did you place the speaker on a stand away from walls as far as practical? If you can get the speaker 4 or 5 feet from anything, that helps a lot. You can usually see the first reflection in the impulse response.

Like this. This test was lowpassed to make the high spl more tolerable. Even with earplugs, it was annoying. The test was for distortion. (Not shown.) For x-over work I test at lower spl, but still use the earplugs.



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See the spike just to the right of the gating setting? That's my first room reflection. You may have to zoom in on the impulse graph to get it to where you can see it easily.

I created a HOW TO thread on HOLM a while ago. It covers the basics and should help you a little.
http://www.avsforum.com/avs-vb/showthread.php?t=1236094

You must have a mic that can accurately measure higher frequencies. I would recommend the EMM-6 from Dayton or a calibrated ECM8000. The RS meters, etc will have too many issues.

You can go this route or go with the Dayton Omni measurement system for about $300.

Kbgl posted good info, that gate is fine for looking at the XO point and beyond. You should change your Impulse window from cm to ms though, then you will know how many miliseconds you are gating out too. You can change it through the menus.

Have you posted this on PE for the designer to help you out? It looks like some XO issues (out of phase wiring?)

You created the XOs yourself?

I though this was a build based on another DIY design. I will re-read about the build because Im confused.

Ah, yeah....you need atleast 4 feet in all directions to get a measurement going.

I still think you need to gate it out to about 4 ms to see everything above 1KHz accurately. Then you measure nearfield to get everything below 1KHz, splicing it all together.