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Old 3rd March 2008, 04:57 PM   #1
NED 209 is offline NED 209  Ireland
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Default tweeter advice

hi all . i recently won a set of beyma 102nd speakers on ebay. im gonna build a diy boombox (another one ) with them.
theyre rated at 103db, so i was tryina find tweeters to match them. im a novice at this stuff. i liked these, because theyre light, 600 grams or so, which is ideal.

http://cgi.ebay.com/Eminence-Supertw...QQcmdZViewItem

theyre rated at 105db. is this a total mismatch, or, will a decibel or so in the difference affect how they sound together?

big thanks,
ned .
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Old 3rd March 2008, 05:26 PM   #2
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Hi Ned,

The Beyma is a mid bass unit so you will need a woofer to go with it. The only frequency chart I could find only went to 2kHz so we can't be sure of the overlap with the tweeter. Also being 10" means the beaming and cone break up might be a problem below the intended XO point of the tweeter.
The sensitivity rating of the tweeters is with their particular horn so it might be lower with whatever horn you choose.
The difference in level can be adjusted with a L-pad.
The sensitivity rating of the mid bass might be fudged a little but again the tweeter can be adjusted to suit.

I trust this is for some sort of PA or outdoor use? This isn't Hi-Fi stuff, it's designed for volume, not accuracy.
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Old 3rd March 2008, 05:29 PM   #3
NED 209 is offline NED 209  Ireland
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that is correct. thanks for the advice
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Old 3rd March 2008, 05:34 PM   #4
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No problem, I misunderstood. I thought you were going to try and use the Beyma for a boom box, my mistake, good luck with the project.
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Old 3rd March 2008, 05:38 PM   #5
NED 209 is offline NED 209  Ireland
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no no, sorry, you were correct, im going to build a nasty boombox, ghettoblaster, portable radio. hook an mp3 player into an amp32. i was thinking with this speaker i could produce lots of volume for a long time, on one battery charge. but you reckon ill need another woofer, im hearbroken it just wont put out enough bass?
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Old 3rd March 2008, 05:48 PM   #6
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No sir. It's called a mid bass but I question that. It's already down about 27 dB at 100 Hz so this I believe should be thought of as a midrange even though it has an Fs of 57 Hz. That means you would need a huge amplifier and an EQ to get any low end from it, but with a 2mm Xmax, it ain't gonna happen.
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Old 3rd March 2008, 05:55 PM   #7
NED 209 is offline NED 209  Ireland
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damn. thanks for the info
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Old 3rd March 2008, 06:36 PM   #8
ScottG is offline ScottG  United States
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http://www.partsexpress.com/pe/showd...number=294-600

http://www.partsexpress.com/pe/showd...number=270-310

http://www.partsexpress.com/pe/showd...number=300-560
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Old 3rd March 2008, 08:45 PM   #9
NED 209 is offline NED 209  Ireland
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Thanks for that Scott. im always apprehensive about starting threads on here cos my level of knowledge is very poor. so far its been unfounded though cos ye've all been super helpful.

ok, scrap those woofers. i want low end, i want xmax.

can anyone suggest 10 inchers that would suit this project? ive noticed that drivers made for several hundred watts have huuge heavy magnets, whereas, some drivers made for only 20 - 80 watts are pretty efficient with only small magnets.

i guess, maybe the 102s were a good place to start, because i had braced myself for their 3.5 kg weight, so now the field is pretty open


id like to keep it a two way system
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Old 3rd March 2008, 09:01 PM   #10
ScottG is offline ScottG  United States
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I wouldn't scrap those woofers.. but for this project its perhaps a no-go.

Start off with Hoffman's Iron Law for your design to recognize your basic trade-offs with respect to efficiency, cabinet size, and low freq. performance:

http://ldsg.snippets.org/appdx-a.php#HOFFMAN
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