Two woofers ?

[juliovideo]

I can connect two woofers in series of 8 ohms and a resistance in parallel for 8 ohms total take. ?

I would have that problem in this design?

thank you.


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[JonMarsh]

You'd be wasting power. If the woofers are really 8 ohms, i.e. not closer to 6 or 5, then don't wire in series; wire in parallel. If they are low enough in impedance that wired in parallel would drop below 4 or three ohms, then you'd better just wire in series. No need to parallel a resistor. Unless you're trying to work with a pre-built crossover, but then you have other problems.

[juliovideo]

Here an example...................

http://www.troelsgravesen.dk/JA8008_DTQWT.htm

"Initially the DTQWT was added only a single bass driver, providing a system impedance of ~4 ohms minimum, not something that should make most decent low-wattage amps uncomfortable considering the overall system sensitivity. My 20 wpc PSE mono-blocks (6AS7 triodes) did well, but adding a second unit in series with the first driver left no doubt that the amps felt better about ~6 ohms minimum. Actually they felt much better and I admit I was surprised by the difference. Distortion was significantly reduced at (very) high levels and the grip on the bass drivers significantly improved. Possibly the reduced cone motion from having two bass drivers also reduces back-EMF (back-electro-motive-force) and SET amps have low damping factor with poor grip on bass drivers compared to push-pull valve amps or solid state amps."





Connect two woofers in series, is right or wrong?

thank you.



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[juliovideo]

You'd be wasting power. If the woofers are really 8 ohms, i.e. not closer to 6 or 5, then don't wire in series; wire in parallel. If they are low enough in impedance that wired in parallel would drop below 4 or three ohms, then you'd better just wire in series. No need to parallel a resistor. Unless you're trying to work with a pre-built crossover, but then you have other problems.

Thanks !!!


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[Paul Ebert]

If you are asking specifically about Troels design, then yes it has two woofers in series. The parallel resistor is part of the low pass filter in this case. He states that the minimum impedance is 6 ohms, so you are fine in that regard.

Everything I've heard about Troels designs has been relatively positive, so I'd say - go for it, especially if you want high efficiency and can tolerate such a large cabinet.

[juliovideo]

If you are asking specifically about Troels design, then yes it has two woofers in series. The parallel resistor is part of the low pass filter in this case. He states that the minimum impedance is 6 ohms, so you are fine in that regard.

Everything I've heard about Troels designs has been relatively positive, so I'd say - go for it, especially if you want high efficiency and can tolerate such a large cabinet.

Thanks ,...............Actually this is a concern,and I do not know, maybe if it is I who does not understand,but I realize the diversity of opinions when they should all be similar.

for example.

Madisound tells me they can not connect two woofer of 8 ohms in series, because that is wrong,......... where to put 8 ohms a resistor in parallel is crazy, for have 8 ohms total.

They can do is connect the two woofer in parallel of 8 ohms but I have only 4 ohms total ,or connected in series two woofer of 4 ohm for have 8 ohms total.

But my woofers is 8 ohms !.........I want 8 ohms total.

I think that a system of 8 ohms total will have better sound quality than a 4 ohms total.

More people will give more importance to the cut of the drivers, but for me the impedance is more important.


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[kevinp.]

I think that a system of 8 ohms total will have better sound quality than a 4 ohms total.

More people will give more importance to the cut of the drivers, but for me the impedance is more important.


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but... that's not true. Unless your amp can't handle 4 ohms and blows up, in which case, yes; 8 ohms would sound better

[Paul Ebert]

Are you using a tube amplifier? If so, perhaps it would make a difference depending on its configuration and output transformer. Otherwise, it should make no difference.

Why not just use one woofer?

[juliovideo]

thanks kevinp

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Then...... theoretical world of audio ; Still do not understand why you can not connect a resistor in parallel for equalizer impedance for two speakers in series with 8 ohms each.

I know how it connects and is calculated, what I do not understand is that many not the look good.

why ?


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[juliovideo]

Are you using a tube amplifier? If so, perhaps it would make a difference depending on its configuration and output transformer. Otherwise, it should make no difference.

Why not just use one woofer?

I have to buy it but not yet.

For this designs ................

https://www.htguide.com/forum/showthread.php?t=33056

thanks ..... :T




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[Face]

Do it right and buy something capable of 4ohms, there's plenty of choices out there.