no thiele small parameters

[H Burch]

hey,
im going to build a small pa system but the drivers im going to use dont have thiele small parameters available. how important are these for pa use when ultimate sound quality isn't the most important factor?

thanks

 

[tvrgeek]

T/S parameters are what you use to size the boxes and select the proper port alignment. Sealed is more tolerant. Building speakers without the ability to measure is usually not a happy experience. This is engineering.

If you described the drivers, maybe someone will have measured them, or at least some generalizations could be made.

 

[PeteMcK]

To measure drivers: Download ARTA: ARTA Your Page Title, Make this simple jig:

 

[winslow]

What speakers? Someone out there might know something about them.

 

[H Burch]

iv been looking into the monacor range. There is very little info about them on their own website and when i emaild they sent me same as on website! Usefull. I dont have the earth to spend on speakers but want decent quality.

 

[winslow]

Well most of the Monacor speakers are rebadged other brands.

 

[H Burch]

any idea what speakers they are?

 

[tvrgeek]

H,

You have not even identified which of their speakers you are looking at, nor have you apparently investigated being able to measure the drivers yourself. It's the weekend, get busy.

You also might look at their site again, I just looked up their 12 inch PA bass speaker and it has full parameters listed. ( SP12-200 )
MONACOR INTERNATIONAL : Product Detail Page

 

[H Burch]

i would love to 'get busy' and measure these myself and have looked into how etc. BUT i dont have the equipment hence using this forum. I will post ones been looking at asap

 

[tvrgeek]

Your computer does not have a sound card?

 

[Richard Ellis]

Don't have a Digital Volt, Ohm meter yet? Spend at least 100 Euros, keep it up, treat it nice & it will last decades.

Your PC can generate sine-waves with some free software, pipe it thru an amp, measure the voltages thru the simple circuit set-up for the driver.
I did this on an unknown 'Car-audio" 6X9 .....Pioneer didn't release any specs. I got an Fs of 60 Hz, a Qtc of 1.06.....It's easy really.

______________________________________________________Rick.........

 

[balerit]

i would love to 'get busy' and measure these myself and have looked into how etc. BUT i dont have the equipment hence using this forum. I will post ones been looking at asap

It's quite easy, see:

http://www.diyaudio.com/forums/vendors-bazaar/215967-diy-loudspeaker-construction.html

 

[H Burch]

i dont have any electronic testing equipment and seems like i may need some. I have looked into it and dont have the equipment. Im not a total chump. Im lookin for help not sarcasm. If you are offering sarcasm keep it to yourself. Dont spend your time on forums having little digs at people like me who dont know everything but want to learn so i can progress. You wouldnt be like that to someones face so dont do it here.

 

[H Burch]

thankyou to two posts above mine

 

[tvrgeek]

You need a PC with a sound card, couple of resistors, a copy of ARTA, and some effort. Cost is not a blocker.

My all time favorite tool is still WooferTester II which runs about $150 US, but you can get started for almost free. I have a used Fluke multimeter and an old B&K LCR meter from e-bay. WT-II can actually measure L and C. Old school is a VTVM, Signal generator and some precision resistors. Takes forever. Use a PC.

Speaker design is ENGINEERING. It is WORK. I have spent about 35 years raising to the rookie point, and I had a degree in electronics to get me started. Don't expect a few quick answers because there aren't any. Put in the effort, and we will help. There are fine folks in this forum who actually do this for a living.