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Newbie question about impedance on amplifier > speaker

Psyskeletor

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Jan 9, 2024
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Hi.

I beg you pardon if i put the topic on the wrong place.

I am pretty new to the audiophile world and i am building my rig.
So far:
Speakers: Polk Audio RTA 8T
DAC: Topping E50
Streamer: WiiM streamer
Amplificator: Topping LA90D

My question is:
My speakers are rated 6ohm, 89 db sentisivity (https://polksda.com/rta8t.shtml) and i want to use another LA90D as monoblock:
- LA90D works on monoblock only in 8ohm impedance: will it destroy my speakers? (rated for 250W)
- I saw on @Amir review "bridged mode" whats is this? connection the output of one LA90D to the input of the second one and then to the speakers?
- Anyone as an opinion about the polkies? for me dound great and if i change the LA90D for my old Hafler DH-200, it sound way brighter, defined and cleaner but i dont know i am really listening to ****** speakers.

Thanks!
 

staticV3

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LA90D works on monoblock only in 8ohm impedance
Officially, the LA90D can be used in Mono with ≥4Ω loads:
7526313.jpg

Indeed Amir tested 4Ω Mono and the LA90D did just fine:
Topping LA90 Discrete Stereo Amplifier Low Gain Bridged 4 ohm Power Measurement.png Topping LA90 Discrete Stereo Amplifier Low Gain Bridged 4 ohm max and peak Power Measurement.png

will it destroy my speakers? (rated for 250W)
No.

I saw on @Amir review "bridged mode" whats is this? connection the output of one LA90D to the input of the second one and then to the speakers?
Bridged mode = Mono mode.

Please don't plug one LA90D into another LA90D, that's a recipe for disaster.
 
OP
P

Psyskeletor

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Thank you very much, i tought it was suited for > 8 ohm loads but reading my la90d instructions, it clearly states > 4 ohm, so my mistake. It seems, 6ohm is on the very safe side.

Thanks again!
 

JustJones

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Thread about mono/ bridged.
 
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