My Onkyo 818 is old and allows you to adjust ohms , id imagine all but must basic Onkyo allow this . Good luck !! My junk Yamaha and Sony htib Amp don’t let me adjust ohms My 15” diy sub is too loud ima go 12” next time . Get one of these https://www.svsound.com/products/pc-2000?variant=9559987395&wiz_medium=cpc&wiz_source=google&wiz_campaign=7977155743&gclid=EAIaIQobChMI7OTg_q3t7QIVA_HACh3Oew2VEAQYAyABEgIRevD_BwE Why did this Dayton subwoofer double in price ?? https://www.parts-express.com/dayton-audio-sub-1500-15-150-watt-powered-subwoofer--300-634 Sent from my iPhone using Tapatalk I will be trying the setup again here in the next few days. I purchased a SB-2000 pro which should be here in the next day or so.