Cable with one direction (2024)

AnalogSteph said:

Better anticipate it now than curse later, right?

Which DAC exactly do you have and what is it connected to, or is it isolated via Toslink or a USB isolator?

The sub seems to be a Yamaha YST-SW300 (thanks, Google image search), that's an IEC Class II device with 2-prong mains plug.

If the power amplifiers with unbalanced input are going to be hi-fi units along the same lines, I don't foresee any major problems just as long as the DAC is kept galvanically isolated on the input side, and ideally of the floating variety on the mains side as well. (I hope you have grounded mains outlets for the crossover, Sweden was a bit late in adopting them if memory serves.)

See Also

Topping DX3 Pro+ Review - The Sound AwardsTopping DX3 Pro+ Review — Page 2 of 2 — HeadfonicsTopping DX3 Pro+ Review - The Sound AwardsTopping DX3 Pro+ Review (DAC & Headphone Amp)

You may have a bit of difficulty reconciling home and pro audio levels, although I think the input and output gain controls should just about give you enough leeway.

What I'm a bit worried about is that this kind of crossover tends to be way too crude and inflexible as a proper speaker XO. It is likely that you'll have to straighten out driver responses passively to make it work. This is advisable for reducing tweeter sensitivity and notching out breakup modes anyway. (No, not everything about a passive XO is bad. A hybrid approach can be better than either purely active or purely passive.)

Click to expand...

That's right, I have Yamaha YST-SW300 subwoofers. You might consider them vintage these days, but I like them. They are measured, 22 Hz f3. Totally ok for me.

I have a Topping E30 DAC, which does not have balanced outputs but if it will cause problems I will sell it and buy a DAC with balanced outputs.

Yes, I have grounded electrical outlets. Maybe Sweden were a little late in introducing it as a law, standard:

Requirements for grounded wall sockets in new construction, conversions and extensions of electrical installations were introduced on 1 July 1994. Requirements for ground fault circuit breakers for indoor sockets with a maximum rated current of 16 amperes came into force on 1 January 2000.

There is no regulation that says an owner of an older property must replace ungrounded outlets with grounded ones. In homes built before 1994, there is usually one (or more) grounded wall sockets in the kitchen.

For this thread, everything below is OT, best to mention it:
Actually, I should probably solve the crossover in the digital world, but now that I have my active crossover, so I'll try it first.
LD X223 is not super flexible. The filter itself is a 4th Order Linkwitz Riley Crossover Filter. A good thing about LD X223 is that the crossover positions are fixed. Then it will be the same on both channels. The disadvantage is, of course, that it reduces the possibility of setting an exact crossover point.
I will set the crossover point to the fixed position 2.5 kHz (or if it was 2.6 kHz I don't remember right now). It, 2.5-2.6 kHz, goes well with the bass (SB15NBAC30-4) tweeter (SB26ADC-C000-4). Then I place the bass and tweeter at a suitable c-c distance. Unevenness in FR should be able to be fixed with EQ. In theory, it should work anyway.

A physical protective capacitor for the tweeter might not be so stupid to have. If the tweeter is too "hot" then definitely a resistor but I can also put gain in and out on the active crossover filter:

...plus the amplifiers have volume control.

Speaking of what you said, if I remember correctly Purifi showed how a passive notch filter reduced distortion, with some example they had.
I think there is a thread about this on ASR ...and after a search, it is addressed by MAB in this thread:

Letting the bass driver SB15NBAC30-4 operating from 100 Hz is actually on the limit as I see it, but it should or it can work. In a 5.5 liter sealed box, F3 will be 107Hz, F6 will be 69Hz and F10 will be 47Hz. Plus that distortion with SB15NBAC30-4 starts to increase from with 200 Hz and downwards, so optimal should really be to use that driver in a three-way construction with crossover point around 300 Hz then, but I can still try with my subwoofers now that I have them anyway.

And a small 5.5 liter test box is easy and cheap to make so why not.
SB15NBAC30-4:

In a 5.5 liter sealed box: