Vintage speaker Recap question
- Thread starter corbinr75
- Start date
-
- Tags
- speaker recap
Register to hide this ad
bowtie427ss
Lunatic Member
Welcome to AK!
I wouldn't do it. That's more than 10% out of spec. From the number crunching perspective it's a nono.
What the exact effect, and it's audibility will be depends on many variables such as the crossover topology and the drivers involved.
For a basic example consider a simple first order 2 way system that just uses a single cap in series with the tweeter. Assuming a nice even 8 ohms at XO, a 6uf cap is going to give a knee point of around 3300hz. If we increase the cap value to 6.8uf, the knee point drops to around 2900hz.
I wouldn't do it. That's more than 10% out of spec. From the number crunching perspective it's a nono.
What the exact effect, and it's audibility will be depends on many variables such as the crossover topology and the drivers involved.
For a basic example consider a simple first order 2 way system that just uses a single cap in series with the tweeter. Assuming a nice even 8 ohms at XO, a 6uf cap is going to give a knee point of around 3300hz. If we increase the cap value to 6.8uf, the knee point drops to around 2900hz.
alteclipsch
Super Member
Bowtie, would raising the uf risk damage to the tweeter? I'm assuming that dropping the crossover point (with a bigger cap) would do so, while raising the crossover point by using a lower uf rating would not damage it, but would limit the high frequency. Correct?
bowtie427ss
Lunatic Member
Given my example of the cap position in the circuit, yes and yes. But, we do not know the OP's circumstances. If he's asking about a cap that's part of a more elaborate filter, all bets are off until we know exactly where that cap is and in what kind of filter/circuit.
7 or 7.2 is often available, that would be closer. Or, 3+4 (or 4.7) (both of the same type) in parallel.
BTW, no embarrassment necessary. I and many others have asked hundreds of similar questions. We pay back the community by answering them for other folks.
Porkloin
Oscar Heil Groupie
The obvious question would be: "Why not just buy a 6 uF capacitor (or a pair of 3's or a 3.3 and a 2.7)?"
Just in case OP Corbinr75 doesn't know, capacitors can be paralleled together to have their combined value form the desired value. If you're having trouble locating a 6 uF cap, get a pair of caps who's summed value forms the desired value ( a pair of 3's or a 2 and a 4 or a 3.3 and a 2.7)
Now, if I were to interpret your question as "Would it be OK to knock my crossover out of spec with a cap of the wrong value I had laying around to save the $1.50 I'd spend to replace it with the correct value?", well, then you should be embarrassed.
