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Old

Cubist Subwoofer to go with Ikea bowl Speakers - just looks wrong!

Posted 1st June 2014 at 01:20 PM by googlyone
Updated 1st June 2014 at 01:24 PM by googlyone

A while back I built some Ikea bowl speakers using Vifa bassmids and tweeters. The performance came out very good indeed, but when you are dealing with a 5 odd inch driver, there will never be masses of bass.

A subwoofer was always on the cards.

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Given the spherical speakers perched on the retro "rocket like" stands, I initially thought of doing a spherical subwoofer - but in the end concluded that while I could do this, I was looking at using fibreglass on a "fit-ball", placement in the room was looking to be a challenge.

So I chose to do the absolute opposite - and came up with an off the wall approach to a conventional sub.

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The idea was to move the implementation of a conventional sub well away from the "box with a driver stuck on the front".

I find it fascinating that...
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Old

Cheapo passive speakers breaking in

Posted 1st June 2014 at 07:02 AM by abraxalito
Updated 2nd June 2014 at 04:54 AM by abraxalito

A pair of these were delivered yesterday. At first I thought their bass sucked and the top end was too 'phasy' - it was only after a while I realized I'd connected them out of phase

Now they're wired up correctly on my TDA1521 amps, they're starting to come on-stream. I rate them as a bargain at the asking price of 228rmb (around $35).

After they've fully broken in I plan to explore what the lowest hanging fruit is by way of tweaks to the crossover....

Update1 - here's the XO, very simple 1st order. 250uH inductor on the bass (0.1ohm DCR, 6ohm bass/mid) and 1.5uF cap for the tweeter (8ohm). The NP cap for the tweeter has a rather high ESR (3ohms at 1kHz) so there might be some mileage in substituting this for a foil cap.

Plotting this arrangement on LTSpice gives a crossover frequency (if -6dB) around 7kHz which seems a little high. If we were to assume a -3dB crossover (because they're in quadrature for a 1st order) then it would...
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Old

Philosophy of boring DIY...

Posted 1st June 2014 at 06:02 AM by hollowman
Updated 1st June 2014 at 05:36 PM by hollowman

I've posted several topics on DIYA over the past few mos. All of them -- almost predictably now it seems -- dissolve into non-issues. I.e., not a lot of outside-the-box thinking ... methinks
Most of my "DIY" time is now on non-English sites like Player.ru and a few sites from Asia.
While the language barrier is large, and all I can do is read (just barely) using Google Translate, etc., -- and can't really post -- these obstacles seem worth the bennies. Namely, modding or building-from-scratch very inexpensive projects.
Many of the members of these non-English forums seem younger ... so maybe more fresh ideas, with more zest to experiment, and members seem to be genuinely cash-strapped (unlike the English-based forums) ... so the economies-of-scale are a lot bigger.
Comparatively, the English-speaking-forum "DIYers", being older, have their bank accounts and retirement incomes ... and, hence, a lot of drive/passion are diminished ......
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