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Multi-Way Conventional loudspeakers with crossovers

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Old 24th April 2003, 06:26 PM   #11
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Yeah, I saw your other thread after I saw this one.

You know, when I was 17 (way too long ago) I took a cab my father already had, tried to duplicate it using scrap plywood in his worshop (3/4 inch at any rate, but with way too many voids) and then dropped a couple of Radio Shack 15" woofers, 8" midranges and horn tweeters into both boxes. Crossover was straight off the shelf as well. Damn I thought those things sounded good!

You're way ahead of me on the curve at that age. Of course, back then no one had too much other than RS. I'm not sure Speaker Builder magazine was even around at the time. Keep working at it (and drop a Shiva or Tempest in that box when you get a chance!)
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Old 24th April 2003, 09:25 PM   #12
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When you were seventeen, I bet there was no internet for you to read all this stuff on, that's probably the reason why
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Old 24th April 2003, 10:50 PM   #13
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well, folks, I'm 19, living at home, and I'm just building my first pair, and I have to say, they're horrid!

The 15"ers on them have very limited excursion, so low bass above 2 watts causes the woofers to bottom out (Waah!) and make this horrible banging noise... the tweeters are not bad, peizo, and the 2.5-way config I've got them in is actually fairly nice to listen to... it's a sealed box so the bass is 3dB quieter than I'd like, but with a little EQ it's just fine.

I want to sell the boxes as fast as I can once I get the finish put on them, so I can build some better ones.... already plans are in the works for a 3-way completely amped speaker pair (VERY ambitious) so all you need is wall current and a line-level signal...

anyway... I feel pretty good for being 19.
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Old 24th April 2003, 11:11 PM   #14
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Uh, I don't know why a woofer would be 2W so you might've mounted it wrong, bending the frame and making it scrape. Try loosening some screws and see if it gets better. I have a few speaks like this.

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Old 24th April 2003, 11:49 PM   #15
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Really? Hmm...

At 1 watt, it gives quite a bit of excursion (~1/2") at the low frequencies without any unpleasant noises... when turned up much higher, there is a new sound accompanying kick drums that sounds, by my intuition, like the voice coil hitting the back plate. Guessing by where I see things, I think this is a real possibility...

anyway, I didn't mean to hijack the thread like that... please resume normal discussion.

I'd heard that by making a sub down-firing, it eliminated an unpleasant artifact of PA speakers where, if you're just the wrong distance away, the bass is really weak... this being undesirable, down-firing woofers were developed in order to reduce or eliminate the effect.

Anyone know about this?
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Old 24th April 2003, 11:51 PM   #16
JoeBob is offline JoeBob  Canada
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2W won't move a woofer that much, unless you've got almost no Xmax. I'd check it again, it's worth a try.
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Old 25th April 2003, 02:17 AM   #17
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Yeah. I just don't buy 1W for a whole half inch...sure you didn't mean half milimeter?

Thread hijack my butt.. (oops ) this thread's had no strictly-on-topic posts since Dave Bullet. Besides, this refers to bass speakers, that's what the thread was originally about so it's not too far off

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Old 25th April 2003, 02:35 AM   #18
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Quote:
Originally posted by BigDaddyD
Keep working at it (and drop a Shiva or Tempest in that box when you get a chance!)

Nah, I want to get a 12inch XLS Peerless and a Passive radiator or 2.. Don't wanna waste my money on cheapish or hard to find parts.. lol and I can get the Peerlesses at trade price.. so, thats $200 AU instead of $300 lol, why not? Hey, now I might be thread-jacking.. lol
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