General Forum

Re: Beovox tweeter replacement

Søren Mexico — Fri, 05 Aug 2011 21:00:26 GMT

http://www.parts-express.com/pe/pshowdetl.cfm?Partnumber=027-336

Re: Beovox tweeter replacement

Evan — Thu, 04 Aug 2011 19:54:07 GMT

Leslie:

Wow, cannot mingle in this discussion Anyway, I'll start with the 6.8uF.....

I'm sure by now, you have already searched and found it, but just in case you haven't Parts Express does have one. Just search "6.8uF".

I would have linked it for you, but I am on my mobile now and it cant manage that.

Dont worry about trying to mingle Leslie, just ask questions if you have them :)

Re: Beovox tweeter replacement

Leslie — Thu, 04 Aug 2011 16:56:30 GMT

Wow, cannot mingle in this discussion Anyway, I'll start with the 6.8uF.....

Re: Beovox tweeter replacement

Leslie — Thu, 04 Aug 2011 16:56:28 GMT

Wow, cannot mingle in this discussion Anyway, I'll start with the 6.8uF.....

Re: Beovox tweeter replacement

Evan — Thu, 04 Aug 2011 14:25:03 GMT

Søren Mexico:

The connection from BV 5000 has a cap before the connector, 4.7 uF, the connector cut of the inbuild tweeters, but the inbuild tweeter has a coil, 0.2 mH, does the original cubes have a coil in the crossover ??

No.

Re: Beovox tweeter replacement

Søren Mexico — Thu, 04 Aug 2011 13:34:11 GMT

The connection from BV 5000 has a cap before the connector, 4.7 uF, the connector cut of the inbuild tweeters, but the inbuild tweeter has a coil, 0.2 mH, does the original cubes have a coil in the crossover ??

Re: Beovox tweeter replacement

Rich — Thu, 04 Aug 2011 12:31:57 GMT

tournedos:

Evan:
A 6.63uF (exact value)capacitor will be hard to find by itself.

...but 6.8 uF, which is in the regular E6/E12 value series, won't. Remember that conventional aluminum electrolytics (bipolar or not) are far from precision components. The specified tolerances can easily be 10-20% either way. And you'll never hear the difference between 6.63 and 6.8 (+2.5%) anyway!

And don't forget, the crossover frequency is where the response begins to get attenuated. With a first-order network, that's 6 dB per octave of attenuation. A capacitor doesn't just cutoff all the frequencies below some magic number.

Also remember, crossover networks are designed as a system with the drivers to supplement the natural roll-off of each drivers response.

Re: Beovox tweeter replacement

Evan — Thu, 04 Aug 2011 12:17:01 GMT

tournedos:

Evan:
A 6.63uF (exact value)capacitor will be hard to find by itself.

...but 6.8 uF, which is in the regular E6/E12 value series, won't. Remember that conventional aluminum electrolytics (bipolar or not) are far from precision components. The specified tolerances can easily be 10-20% either way. And you'll never hear the difference between 6.63 and 6.8 (+2.5%) anyway!

I agree we should aim for the original specs if these are to be used with old Beovoxes that have an output for them. And if not, the exact crossover frequency is even more unimportant. After all, you're just going to bend the allover frequency response of the speaker system away from straight...

I was going to jump straight to 7uF!

I'm pretty sure that the caps I bought for my reproduction cube project have at least 20% difference between them. They don't sound exactly the same!

Re: Beovox tweeter replacement

tournedos — Thu, 04 Aug 2011 11:28:30 GMT

Evan:
A 6.63uF (exact value)capacitor will be hard to find by itself.

...but 6.8 uF, which is in the regular E6/E12 value series, won't. Remember that conventional aluminum electrolytics (bipolar or not) are far from precision components. The specified tolerances can easily be 10-20% either way. And you'll never hear the difference between 6.63 and 6.8 (+2.5%) anyway!

I agree we should aim for the original specs if these are to be used with old Beovoxes that have an output for them. And if not, the exact crossover frequency is even more unimportant. After all, you're just going to bend the allover frequency response of the speaker system away from straight...

Re: Beovox tweeter replacement

Evan — Thu, 04 Aug 2011 11:06:51 GMT

Leslie:

Hi Evan,

Sorry, but this is out of my knowledge Electronics is not my thing you know. Probably a stupid question but what type of caps do I need to use (Bipolar???). Can you give me a link where I have to look for regarding to specs? The site (thanks to you) were I bought the tweeters would be handy since I have to buy them again for my self made cubes.

Don't worry Leslie, we will help you figure it out.

Soren is right, electrolytic bipolar is the type to use. That site, Parts Express, has many capacitors to choose from. A 6.63uF (exact value)capacitor will be hard to find by itself. First, you must make the call on exactly which frequency they will be crossed over at. What minimum frequency do you want the speaker to play at?

Are these cubes you are working on right now going to be used with the original BeoVox 3000/5000? If so, I would try and keep them as close to the original frequencies as possible. Which for you means 2500+. The capacitor value depends upon the lowest allowed frequency value you decide on.

Re: Beovox tweeter replacement

Søren Mexico — Thu, 04 Aug 2011 01:31:38 GMT

Take a look here a 8 ohm tweeter, needs 6.3 uF for filter at 3000 Hz

Re: Beovox tweeter replacement

Søren Mexico — Thu, 04 Aug 2011 01:04:00 GMT

Bipolar electrolytic will do.

Re: Beovox tweeter replacement

Leslie — Thu, 04 Aug 2011 00:36:26 GMT

Hi Evan,

Sorry, but this is out of my knowledge Electronics is not my thing you know. Probably a stupid question but what type of caps do I need to use (Bipolar???). Can you give me a link where I have to look for regarding to specs? The site (thanks to you) were I bought the tweeters would be handy since I have to buy them again for my self made cubes.

Re: Beovox tweeter replacement

Evan — Wed, 03 Aug 2011 19:47:29 GMT

Søren Mexico:

Leslie search for crossover calculators, there are plentey on the net, as your cube is a tweeter I would make it up about 3000 or even 3500 Hz, but check the calculators, or start with 8 uf and increase.

Thats exactly where I crossed over my new reproduction pair of 2500s, 3500hz. I used a 10uF cap but that exact freq calls for a 10.36uF so currently I am actually operating slightly higher lower than I ought to be.

Rich has just sent me his overstock of capacitors to allow me to experiment.

Listening to my reproduction cubes, I think I would like to hear more, and adding 1000-1500 extra Hz at the bottom would probably give me what I want. Only problem is my tweeters are domes and wont like being stretched below 3500hz.

Re: Beovox tweeter replacement

Leslie — Wed, 03 Aug 2011 09:53:31 GMT

Will give it a try with the originals, thanks guys, helpfull as always...