SDA SRS 2.3 TL resistance?

billben3

i checked in the manual, says it's d.c. resistance is 6 ohms
so, if a power amp is 100 watts in 8 Ohms and 200 watts in 4 Ohms
in SDA's this amp gives what? 150 watts?

audioluvr

Sure

Navy_Goat

Most amps are not quire that linear regarding power as it relates to impedance, but that would be in the ballpark. Current is the more important factor anyway. After all it is and amplifier not a wattafier.

Specs for my Para HCA 1500

Continuous Power Output - Stereo:
205 Watts RMS x 2, 20 Hz-20 kHz, 8 Ω, both channels driven
315 watts RMS x 2, 20 Hz - 20 kHz, 4 Ω, both channels driven

Current Capacity:
60 amperes peak per channel

Power increases by just over 50% as you cut impedance in half. Their Spec sheet would indicate that current remains the same.

Schurkey

Navy_Goat wrote: »

After all it is and amplifier not a wattafier.

Interesting concept.

Navy_Goat wrote: »

Current Capacity:
60 amperes peak per channel

Almost certainly a non-musically-relavant spec. Practically a lie.

Amp manufacturers love to claim crazy "amperes" specs, they do it by torturing the amplifier into a near-dead-short, with an impossibly short-duration burst so nothing gets overheated. Nothing in music or speaker systems presents that sort of load.

Ask the manufacturer to explain their "peak ampere" spec protocol. Without that, the spec is meaningless. With that, it's probably meaningless.

Navy_Goat

Schurkey wrote: »

Navy_Goat wrote: »

Current Capacity:
60 amperes peak per channel

Almost certainly a non-musically-relavant spec. Practically a lie.

Amp manufacturers love to claim crazy "amperes" specs, they do it by torturing the amplifier into a near-dead-short, with an impossibly short-duration burst so nothing gets overheated. Nothing in music or speaker systems presents that sort of load.

Ask the manufacturer to explain their "peak ampere" spec protocol. Without that, the spec is meaningless. With that, it's probably meaningless.

No doubt you are right about this. Since the method for measuring these "Specs" is not regulated or even standardized the are nearly worthless as points of fact. On the other hand, these Polks need decent power and current to sounds good. I would never expect to see 60 Amp out of my Parasound and I am not sure how the SDAs would handle a full 60 amps.

I am not an electrical engineer. I am just a dumb Navy trained electronics tech and my training was way back in '94. I went to school with a bunch of good guys, so we were more likely to be barking at the moon on Beale St than studying. Much more likely if memory serves. WIth all that in mind, here is how I see it....

Power=voltage*current

I high current circuit is much more difficult and expensive to design and produce tan a high voltage circuit. To increase power you only have to increase current or voltage. Voltage is much easier to increase, but will not improve the sound very much if at all.