Looking to replace tweets

[Why So Cereal? 5,000+ posts]

I have a set of the Boston Pro 50 comps and one of my tweeters is shot! When i read it with a DMM, i get nothing. The other is 6.7ohms. (so I'm assuming they are 6 ohm tweeters) Could I simply replace the tweets with other 6 ohm tweets and keep it movin? and if so, what tweets would you recommend? Trying to get best bang for the buck here as I'm already over budget with this setup.

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[mylows10 5,000+ posts]

got some cdt t25 tweets for sale never heard of 6 ohm tweets

 

[Why So Cereal? 5,000+ posts]

should I be looking at the DC resistance as opposed to the nominal impedance?

 

[mylows10 5,000+ posts]

nominal impedance ,also freq range

 

[Why So Cereal? 5,000+ posts]

What about a 4 ohm tweeter with a 2 ohm resistor in series for 6 ohms?

 

[mylows10 5,000+ posts]

are you trying to keep a 6 ohm impedance or what , if so why you want the lower impedance to get more power from your amp,i personally dont like any lower than 3 ohm

 

[Why So Cereal? 5,000+ posts]

I wanted to keep a 6 ohm tweeter to keep from changing my xover frequency. plus I'd just feel better that way.

is there anyone that fixes tweeters? Its an open circuit so maybe it can be fixed??

 

[The_Grimy_One 10+ year member]

Are you using the passive Xover that comes with the Bostons? I know for sure once the speakers go through the Xover they become 3 ohm, so I think you may be right. I am sure you can find a set of boston tweets on ebay or something, may be a lil pricey tho.

 

[Why So Cereal? 5,000+ posts]

Are you using the passive Xover that comes with the Bostons? I know for sure once the speakers go through the Xover they become 3 ohm, so I think you may be right. I am sure you can find a set of boston tweets on ebay or something, may be a lil pricey tho.

250 of dem thangs!!!

 

[VWBobby 10+ year member]

I would try to find some replacements with specs as close to the originals as possible. That way the crossovers work as Boston designed.

Maybe try Partsexpress, Madisound or Sonicelectronix? I'm assuming that they might be 8 ohm nominal tweets that read around 6.7 of resistance....?

The 8 ohm tweeters I looked up had around 6.7-6.9 ohm dc.

 

[dontbeaprix 10+ year member]

here they are, they are 8 ohms and it shows the specs for them.

WoofersEtc.com - Neo Type-M - Boston Acoustics Neo Type-M Imaging System with alloy dome tweeter

 

[dontbeaprix 10+ year member]

Boston Acoustics NEO-TYPE-M-SE 1" Type-M Alloy Dome Car Tweeters 200W Pair on eBay!

 

[Why So Cereal? 5,000+ posts]

I'm thinking about simply replacing my pioneer mid with Boston mid all on the pioneer xover using the pioneer tweets upfront and the pioneer mid as rear fill still.

 

[keep_hope_alive Premium Member]

you really should get the impedance plot of the Boston tweeter, then get a new tweeter pair that matches it.

I have a Woofer Tester 3 that can give impedance plots. Mail me the tweeter and i'll test it for you. The test takes about 5 minutes from start to finish. I'll mail the tweeter back. if you include the pair, i can see if it's a simple tinsel lead that came detached on the non-working one.

this is a plot from an OZ-25 tweeter

 

[keep_hope_alive Premium Member]

this plot is an excellent example of why running active is preferred. notice the impedance spike at 2kHz. this will affect the crossover point since the crossover point varies with load impedance. this is true for all speakers with passive crossovers. as a general rule, you want the xover point at least an octave or more above the fs of the driver. running active eliminates this issue.

note that an octave above is a doubling of frequency. so for this tweeter, a passive crossover point would be preferred around 4kHz. if I have a 12dB/oct slope that is centered at 4kHz, i can expect to be 12dB down at 2kHz.

here is a different tweeter, an ID NX-30

the cool thing about the Woofer Tester is that it can also sweep with the passive crossover in-line.

here is an Eclipse 8971 component coaxial speaker (has separate crossover but tweeter is mounted in the pole piece)

this is with the passive crossover:

now, if we connect two speakers and crossovers in parallel:

and if we connect two speakers and crossovers in series:

cool, eh?