Watts and power

Oops, sorry meant to say:

simpler 3rd order low pass

Best,
E

erik_squires,

Did you look into resonances? It is not uncommon to use the "cross-over" to damp a resonance. Your assumption is that the cross-over designer was competent as well. Especially in boutique audio, my experience is that is often not the case. Thank you for the post. Always good to have a reasoned discussion.

Hi @audiozenology:

I did a complete speaker and crossover analysis.

This means I measured the impedance and FR of each driver in the near field to achieve quasi-anechoic measurements. I further took the crossover apart and simulated the entire speaker in XSim. I validated my simulation by matching the simulated frequency and impedance curves to actual.

I then compared the simulated original crossover to a simulated crossover using a more conventional approach. So when I write:

would have duplicated the transfer function

This means that the input of the crossover to the output of the crossover would have been the same given the measured driver impedance.

What you are describing is akin to notch filters. That’s not what was present, and if I had not taken this into account, the two transfer functions would have been different. Further, resonance filters typically appear at the top end of a driver’s range, not the bottom.

Best,

E

Your selective cut and paste and your mention of phase angle shows you neither understand my post nor amplifier specs.

No it is you that has no understanding sir, as the combined loading the amp sees, of -phase angle plus low impedance can look a very much harsher load to the amp than just the low impedance alone. And you need amps that can almost keep doubling their wattage for each halving of load impedance to drive them well and if the said speaker is high efficiency but has that evil loading (as Alexia ect have) then you don't need so many watts but still need the double of those watts to signify current.

Like said listen to the Alexia driver by the 3000w Behringer then with the 25w ML2's  

No, you are wrong Georghifi , and I see you have made this wrong claim many times on this forum and even though many people have told you you are wrong, you keep making it.

Phase-angle w.r.t. load impedance is only "harsh" in that it places significant thermal stress on the output devices of linear amplifiers and additional loading on the power supply. That does not impact Class-D amplifiers. It is a transient condition in real world music. In continuous power measurement, it is NOT a factor of current delivery as maximum dissipation DOES NOT occur at the peak current / lowest impedance. That goes back to my original post above w.r.t. the importance of the power supply, which can support transient peaks with capacitance, but if you want "nice" continuous measurements, you need a beefier transformer/switching supply.


Again, you are making a leap w.r.t. amplifier performance that you are NOT able to make with the limited information available. 2 amplifiers each able to deliver 100 watts cleanly at 2 ohms, can each supply the same current no matter what they may do at 4 or 8 ohms. Without knowing what the inherent limitation is of the design, you cannot make conclusions, only assumptions ... and you know what they say about assumptions.


Being able to deliver 1500 watts into 2 ohms, cleanly, does show the ability to deliver 27 amps. Being able to deliver 100 watts into 2 ohms, shows the ability to deliver 7 amps. Any other conclusions you want to attempt to come to are just conjecture.

-phase angle plus low impedance can look a very much harsher load to the amp than just the low impedance alone.