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DIY Loudspeaker calc

post #1 of 3
Thread Starter 

Hi all, i have recently just refurbished some old Wharfedale speakers i had lieing in the attic from the late 70s. They are Wharfedale Dovedale SP's. They were a 79 model i think and come with 3 way crossover and the well recognised white midrange 4.5" speaker with laser cuttings to reduce resonance. They also have two 6.5" mid/bass drivers and a single tweeter.

 

Basically i have gone ahead and replaced the tweeters with scanspeak classics of the same impedence and freq response because one of the originals had blown. I have had to replace all the bass drivers with the most similar drivers i could find within my price bracket too. I also went about repairing and upgrading the crossovers and replaced all internal wiring with decent copper stuff.

 

Now my main question is, can anyone provide me with a calculator or some way of calculating the recommended size of cabinet for the new drivers ive chosen to replace the original ones? The spec of the drivers can be found here:

 

http://www.seas.no/index.php?option=com_content&task=view&id=109&Itemid=131

 

The speaker cabinets are 55litres a piece and since i have two drivers in each cabinet i think this should be ok; but i am struggling to find any method to calculate the recommended cabinet size when using two drivers in one cabinet.

 

Some help would be appreciated if anyone can provide me with some results or even just some method of calculating a recommended box volume for these drivers when used together.

 

Thanks in advance,

 

Andrew.

post #2 of 3

You can get many calculators for speaker building here: http://www.madisound.com/services/hifispeakerdesign.php

 

For the 6.5 inch Seas paper cone driver, I would suggest you to take at look at the Seas H1456, which got a copper ring and has less distortion than the H1215. If you are not fixed on paper cone, the latest H1571 is a very good driver which goes down to 30Hz. I have used the 5.5 inch version of the driver (H1520) and its frequency extension is amazing.

 

All the above drivers, including the one you mentioned are sutiable for bass reflex type usage. If your Wharfedales are sealed design, you may want to use the H1217.

 

You can also get more opinion from the diyaudio forum. There are more speaker building experts there, especially on crossover designs.

post #3 of 3
Thread Starter 

Thankyou for your help, i will go over to the diyaudio forum and post the topic there too. Thanks for the calculator as well, that was a big help :D

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