Any good references for calculation of Speaker & Amplifier current / Voltage / Power matching ?

[reignofchaos]

1.8ohms is not speaker impedance, the lowest the article claims is 2.84 ohms. The manufacturer claims 6 ohms impedance and then claims 23Hz porting at 3.5ohms and measurement says 2.84 ohms. Nothing is matching. One thing is for sure, the specs dont seem correct. Nothing new.

If you see the entire graph stays well above Re, probably they used 2.84ohm woofer and claimed 6 ohms impedance, I would interpret this way. They certainly know what they are doing, only its not evident to us. Its not correct to call this speaker as 6 ohms, most amplifiers will struggle at 23Hz with this speaker. Its 2.84ohm speaker to me.

EPDR is what matters not the raw impedance since every device will have a different phase angle and a more negative phase angle reduces the effective impedance seen by the amp.

 

[availlyrics]

 

[rwnano]

Thanks for your kindness in responding.

 

[availlyrics]

 

[Hari Iyer]

Just ignore there tall claims, majority of AVRs can hardly support even a 4 Ohms load.

You are factually incorrect here.
I an using my DENON AVR-1604 as a subwoofer amplifier with a 2 ohm load without any issues past 3+ years. They are connected to 2 x 12", 4 ohms woofer in a push-pull arrangement in an H-frame open baffle.
When i connect them as a 8 ohm load the bass is very thin and not powerful. The 2 ohm load gives excellent bass and punch which i enjoy a lot.