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Made in South Korea, HOOL-SPL series amplifiers provide the most advanced SPL options for audiophiles seeking maximum power with unparalleled performance and sophistication. Find the most powerful subwoofers and plug them to the SPL series. Create an elaborate build, compete, win. These amplifiers are the highest rated amplifiers today's technology can manufacture. Only recommended for serious installers, competitors, and people who want to be heard by anyone within a mile radius.


Model HOOL-SPL3.5K
Number Of Channels 1
Frequency Response 10Hz-350Hz
Max Power  5520W
1 Ohm RMS Power (14.4 V) Per Channel 1x3500W
2 Ohm RMS Power (14.4 V) Per Channel 1x2100W
4 Ohm RMS Power (14.4 V) Per Channel 1x1100W
1 Ohm RMS Power (16V) Per Channel 1x4600W
Speaker Impedance Range 1-4 ohm
Input Sensitivity 10-0.2V
Low Pass Filter 30Hz-250Hz
Power Input 1x0GA
Fuse Size  350A (Recommended)
Signal-To-Noise Ratio ≥ 100dB
THD <0.15%
Bass Boost 0-12dB
Product Dimensions (LxWxH) 560x250x58mm

Customer Testimonials


Its 100% the  best place I’ve shopped for my car audio needs big and small always take my calls answer any questions I may have and your quick shipping is absolutely the best!

I rate the value of my purchases a 5! 

Michael Varela

Low Hertz is a lot more than a website. I know I could reach out to them if I needed anything.
No, not just with products. You can always count on quality. But questions about the hobby. Low Hertz is a movement in Car Audio. Where your not judged but helped! So get in the movement with us.
#RepTheMovement #LHCA

Ben Davis

Awesome place. Awesome customer service. Great people and always answer questions and get orders together. Great shipping time. Highly recommended. #1 spot for great service

Nick Brownell

I've been ordering from Low Hertz past few weeks now, I tell you these guys are on point! Fast shipping and the best part is... No Tax! I am a loyal customer and If you don't have the customer service like these guys, then your cut off. I will definitely get more stuff from Team Low Hertz! Thanks again for your hard work!

Johnson Thammavong

Man these guys go above and beyond. the customer service is off the charts.. #LHCA is the way to go.. I love my #LHCA bass knob, and you bet imma rock that #LHCA swag everywhere I go...

David Ebel II

The customer service is world-class!  Zack and his team were super responsive and went out of their way to research and come up with some creative solutions!  The product selection, prices and shipping are some of the best you’ll find anywhere online.  Plus the fitment and ease-of-installation of their products are excellent.

Casey McGehee

The last 3 box designs I've purchase were all 150+ db certified in the lanes, your results may vary depending on vehicle and power but they definitely know what they're doing. Well worth the money !

Eric Feliciano

They designed my husbands box. Came out great. Never a disappointment when it comes to these guys. Definitely will be coming back for another build!

Katie Belluno
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