​Audio Components & Capacitors

Kirkebjerg Parkvej 4 | 2605 Brøndby, Denmark


Frequently asked questions

- I would like to replace the traditional two pole capacitors in my power supply with four pole ones. Is it possible and how?

Yes it is possible and neither so difficult. You should make some minor changes in the circuit where the traditional two pole capacitors should be replaced by the four pole ones.

First of all remove the two pole capacitor and mark the polarity on the panel or circuit board.

When you have a two pole capacitor in the circuit, you have also wires leading to positive and the negative pole of the capacitor. These two wires (or in printed circuit copper band leads) should be cut off near to the original capacitor connection. By this way you get two wires for each pole. One, which leads to the circuit and another which leads to the old two pole capacitors connection point. Simply connect the short wire, leading to the positive terminal of the two pole capacitor to the positive output and the other part of this positive wire leading toward the circuit to the positive input of the four pole capacitor. Make the same on the negative side and your four pole capacitor is connected.

- What kind of improvement of the sound quality can I expect when I replace the traditional two pole electrolytics with fire pole ones in the power supply of my CD player/amplifier?

The degree and the type of the improvement you will get replacing the two pole electrolytic capacitors (even if they are one of the highly regarded types with graphite particles in the capacitor paper or with ceramic particles in the electrolyte) with the four pole ones of course depends on your equipment, but we guarantee a significant and audiable improvement in transparency, high frequency capabilities, detail, dynamics and microdynamics, immediacy and clarity.

- I need large capacitances in my circuit; can I parallel connect the fire pole capacitors to increase the capacitance and at the same time maintain the advantageous filter/suppression effect?

Yes you can, and what is more you can also parallel connect two pole capacitors to the four pole ones and reuse your old two pole capacitor and in the meantime take advantage of the four pole capacitors filter and suppression effect.

When you connect the four pole capacitors in parallel, in the classical way by connecting one capacitor is positive input to the others positive inputs, the positive output to the others positive output and so on, you are not only getting the capacitance multiplied, but at the same time the direct current resistance reduced, as the resistance of the foils also is parallel connected.

It is very advantageous when you need high DC current flow on the capacitor bank.

By parallel connection of the four pole capacitors, their filter/suppression effect is fully maintained. It means that the transfer impedance corresponds to the capacitance value you have achieved by parallel connecting of two or more four pole capacitors.

For example 10.000 µF 40 V four pole capacitors transfer impedance is about 1.3 mohm (check in the table on the datasheet). When two of them are parallel connected the capacitance is the double, about 20.000 µF and the transfer impedance is about 0,9 mohm, almost the same as the transfer impedance of a 22.000 µF 40 V capacitor seen in the table.

 In case of parallel connection of three pieces of the same type, the transfer impedance decreases to about 0,7 mohm and so on.

​The filter/suppression effect is fully maintained but the DC resistance is multiplied when you parallel connect four pole electrolytics by connecting the first capacitors positive output to the seconds positive input and the first's negative output to the seconds negative input and so on if you want to connect more capacitors.​

This method has both advantages and disadvantages. The disadvantage is coming from the fact that the DC current must flow trough both the anode and cathode foil of all capacitors you connect in parallel. The DC resistance could be up to a few ohms, when connecting three or more capacitors in parallel in this way. The loss coming from this source together with losses caused by the ripple will be so high that this connecting method could be considered as unacceptable in most applications.

However if your current requirement is low or you definitely need to implement a few ohms of inductance free resistance in the line, this coupling method is your choice. The wiring of this variation is also much more simple.

Parallel connecting of two pole and four pole electrolytics is just straightforward.

The only rule is that the two pole capacitors must be connected to the input terminals of the four pole. The transfer impedance of the system depends only the resulting capacitance and can be calculated as on described above.

- I have a tube amplifier and I need electrolytic capacitor with a rated voltage above 600 V.

Thus you don't have foure pole capacitors of this rated voltage if I serial connect two 385 V or three 250 V fire pole capacitors I could reach the desired voltage. Is it a way to solve the problem?

No, we do not recommend series connecting of our four pole electrolytics.

The voltage on the series connected electrolytic capacitors is divided in proportion of the capacitance of the capacitors. As the capacitance tolerance of the electrolytic capacitors is generally rather wide (-10/100% to -10/+30%), it could happen that one of the series connected capacitors get a higher voltage, than it was originally calculated to.

The voltage overload reduces the lifetime of the capacitor, make unbalances in the circuit and in worst case might make the capacitor to explode.

There are of course work arounds for the problem as i.e. using capacitors with very similar characteristics or the application of bleeder resistors in parallel connection with the capacitors.

Even if this solutions might work satisfactorly in different power applications as welding machines and laser equipments, they are unacceptable for high end audio applications.​


​A/S Tobias Jensen Production 

CVR: 14006249


Kirkebjerg Parkvej 4, 2605 Brøndby




Phone: ​(+45) 43 27 16 85

E-mail: info@jensencapacitors.com