What ohm load is this?

[boogeyman 10+ year member]

where is everyone coming up with 6 ohms? a 4 ohm speaker and an 8 ohm speaker wired parallel is 2.667 ohms not 6 ohms

 

[x1le 10+ year member]

boogey, you're confusing the hell outta me.

 

[boogeyman 10+ year member]

what is confusing x1le maybe I can help

 

[on1wheel01 10+ year member]

hell if i kno but maybe some restrictive smoke can be let out then allowing you to drop to .5 ohms

 

[ciaonzo 5,000+ posts]

It's a fact that when an amplifier is bridged with a single driver on it, each channel "sees" half of the driver's resistance. With an 8 ohm driver, each channel will see 4ohms. Now factor in an additional 4 ohm load per channel, without any passive crossover between the sub and the components, and the final load will be 2ohms per channel. The only way to keep the amplifier at 4ohms per channel is to make certain that the sub and the components do not overlap for any part of the frequency response and that will take careful designing of a passive filter. I didn't see any passive filter components in the drawing so I'm forced to assume there aren't any, in which case, the final load is 2 ohms per channel.

 

[galacticmonkey 5,000+ posts]

Whatever, who knows. I took the comps off and bridged 2 Selenium D250 horns on it.

Its loud as fuck. //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[ciaonzo 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/handclap.gif.0c301076f534e244f0460706894f19e0.gif

 

[galacticmonkey 5,000+ posts]

Please, hold your applause.

 

[ciaonzo 5,000+ posts]

Thanks for the help.

Fixt.

And you're welcome.

 

[x1le 10+ year member]

It's a fact that when an amplifier is bridged with a single driver on it, each channel "sees" half of the driver's resistance. With an 8 ohm driver, each channel will see 4ohms. Now factor in an additional 4 ohm load per channel, without any passive crossover between the sub and the components, and the final load will be 2ohms per channel. The only way to keep the amplifier at 4ohms per channel is to make certain that the sub and the components do not overlap for any part of the frequency response and that will take careful designing of a passive filter. I didn't see any passive filter components in the drawing so I'm forced to assume there aren't any, in which case, the final load is 2 ohms per channel.

that makes sense.

he would be able to make all 3 speakers see 4 ohms if he ran the amp bridged tho and wired like I stated originally. Series the 2 4 ohm drivers and then parallel to the 8 ohm one.

 

[gtbike900 10+ year member]

it is 2 ohms are ppl realy that dumb six ohms come on if bridged 8 ohms = 4 ohms per chanel and with the other 4 ohm speakers it 2 per chanel its common sense when ever your bridge a amp each chanel see half the starting ohm load

 

[ciaonzo 5,000+ posts]

that makes sense.
he would be able to make all 3 speakers see 4 ohms if he ran the amp bridged tho and wired like I stated originally. Series the 2 4 ohm drivers and then parallel to the 8 ohm one.

With that approach, if you series the two 4 ohm drivers, you lose the stereo separation between the front stage drivers, not good. In addition, if you series those two drivers, you have 8 ohms. 8ohms for the fronts, 8ohms for the sub, parallel that and you have a 4ohm load. The amplifier still sees 2ohms per channel. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[CoequeCrype]

If you plan on building up some higher power amps, go for the pParts Express loads, they should be more than adequate for 99.9 of all test requirements.

The smaller and less expensive 8 ohm, 25W resistors should be fine for lower power testing, or short-term higher power. Theyre probably "inductive"which doesnt metter except for precise instrument testing. For dummy load usage, theyre perfectly good.

For higher power, a simple series-parallel arrangement will work.

For 4 ohms, use 2 in parallel, for 16 ohms, two in series, etc...

/ed B in NH

 

[Johnny Law.Lulz 5,000+ posts]

its 17 milla-ohms //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif