OHMS OHMS, WIRING

If I bridge an amp that has two 4 ohm channels it will see 2 ohms, right and if I wire two 8 ohm subs in parallel that would make 4 ohms, right. The subs are 150 rms, each, rated and the amp runs at  125 rms at 4 ohm and I'll bridge that to get a 2 ohm load at 250 rms right. The amp is only 2 ohm stable so I wouldn't bridge it at 2 ohm to get an 1 ohm load at 300 rms.

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>If I bridge an amp that has two 4 ohm channels it will see 2 ohms

yes, IF the load you connect is "4 ohms" (like 1 4--ohm driver) the amp will "see" 2 ohms, which is min. impedence for a "2-ohm stable" amp.

>if I wire two 8 ohm subs in parallel that would make 4 ohms, right.

correct. This is fine on a bridged stereo amplifier.

>The subs are 150 rms the amp runs at 125 rms at 4 ohm

so with two parallel-wired 8-ohm subs, and the amp bridged mono, the subs will get 500WRMS total between them. This power rating is slightly higher than their combined 300WRMS power handling rating but depending on the amp this may not be a big deal. I just recommend you keep the gains turned down at first, and find a point where the subs sound the best without over-powering them.
You should be fine.


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-GlassWolf
Pioneer Stage-4, Orion, DynAudio, Fi

Thanks GlassWolf I owe you one but how will 2 i25 rms subs make 500 rms

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Thanks

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no no
each sub is rated to handle 150WRMS. combined on a single channel the total combined power handling is then 300WRMS between them.

The amp's output bridged mono with a 4-ohm load will be the same as a stereo two-ohm load.
125WRMS x 2 @ 4 ohms (250W)
250WRMS x 2 @ 2 ohms (500W)
500WRMS x 1 @ 4 ohms (500W)


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-GlassWolf
Pioneer Stage-4, Orion, DynAudio, Fi

Thx.

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