Crossover capacitors change - clarifications on values

[KKG@#]

Hi guys, I am changing the capacitors in my old NHT 2.5i speakers, could anyone help clarify how to read and understand the values -

1. 200uf 100V bipolar
2. 135uf 100V bipolar (I can't find 135uf so I thought of using 125uf + 10uf = 135uf)
3. 8uf 100V bipolar (I can't find 8uf so I thought of using 8.2uf)
4. 2.7 100V bipolar

What does V means? Volts A/C (vac) or Volt D/C (vdc)? The caps in the crossover does not say if it is vac or vdc.

Thank you guys.

 

[Spunky]

Hi guys, I am changing the capacitors in my old NHT 2.5i speakers, could anyone help clarify how to read and understand the values -

1. 200uf 100V bipolar
2. 135uf 100V bipolar (I can't find 135uf so I thought of using 125uf + 10uf = 135uf)
3. 8uf 100V bipolar (I can't find 8uf so I thought of using 8.2uf)
4. 2.7 100V bipolar

What does V means? Volts A/C (vac) or Volt D/C (vdc)? The caps in the crossover does not say if it is vac or vdc.

Thank you guys.

Did you not try to work on it a couple of years back?

 

[KKG@#]

Did you not try to work on it a couple of years back?

Yes, you remembered, a year ago. It was put on hold due to work. I am on it again. I got the caps, the values as mentioned, last month. When I went through the vendor's catalogue with the values, the said caps came up. I asked the tech if these will do and he said yes but emphasised that they must be bi-polar type only. They are all bi-polar, however, I messed up on the voltage. I thought they should be Vdc but the tech says it should be Vac. I checked the vendor's catalogue again but could not find any of the required uF value caps with 100 Vac, only Vdc.

I searched google and it was the same, such uF values bi-polar types are available in 100 Vdc only.

I wrote to NHT for some help and they replied - 'Apologies but we don't provide that information to the general public.
However, most of these can be found if you type what you're asking me at mouser electronics.' How nice of them.

I checked Mouser website, again the required uF values are not available in Vac, the whole column under Vac was blank. What does this mean?

Some help would be most welcomed, than you.

Thank you guys.

 

[ghemml]

Don't be to bothered by the voltage rating. A 50v capacitor can even do the job for a loudspeakers.

 

[KKG@#]

Don't be to bothered by the voltage rating. A 50v capacitor can even do the job for a loudspeakers.

For the 200uF 100Vdc the value in Vac is just 35Vac, so are the others - 100Vdv & 35Vac.

I even tried ChatGPT and it says :-

'In the context of capacitors, "V" typically stands for voltage rating. In the case of your capacitors, the rating "100V" indicates that they are rated for a maximum voltage of 100 volts. This voltage rating specifies the maximum voltage that can be applied across the capacitor terminals without risking damage to the capacitor. It refers to the DC (direct current) voltage, as capacitors are typically rated for use in DC circuits. However, it's worth noting that capacitors rated for DC voltage can usually also withstand AC (alternating current) voltage of similar magnitude.'

 

[ghemml]

You will never reach 10VAC injection into a loudspeaker. Even with 100VDC rating, the AC rating is 100 / 1.414 which is 70VAC, it is still more than sufficient to use for loudspeaker applications.

At 10W over 8ohms which is around 8.9VAC, it is already unbearably loud to the ears.

 

[KKG@#]

Hi fellas, got all the caps replaced and now running-in the speakers/caps. So far so good. Sounds better than I remembered.

Long time ago, some wise person said - if your amp/speakers/?? is over 15 years old, change them caps and they'll sing like new! I wish the same could be said about the human bean ;-) .

Thank you guys, for all your guidance.

 

[DJQ]

Hi fellas, got all the caps replaced and now running-in the speakers/caps. So far so good. Sounds better than I remembered.

Long time ago, some wise person said - if your amp/speakers/?? is over 15 years old, change them caps and they'll sing like new! I wish the same could be said about the human bean ;-) .

Thank you guys, for all your guidance.

15yrs speakers I sell off already. I replace crossover parts at the 6th Yr mark. Giving it another 4yrs before I decide next spks.
Yes I do miss my old modded spks. Well it's what makes hifi exciting.