Can I connect left and right input from subwoofer to subwoofer output on amp.

Yes. You don't necessarily need to use both sub inputs (can use a mono cable), but you will gain some sensitivity (a little more output from the sub, and can help with some sub's auto turn on feature) by hooking one end up to your receiver or prepro's sub output and the other ends to your left and right sub inputs.

Can use this cable to connect a new receiver with an older subwoofer that has line in and out rca connections? my receiver only have the subwoofer out

Only connect receiver to line in on sub!

Can it connect a klh subwoofer to a pioneer receiver

Of course, klh subs have RCA inputs and all Pioneer AVRs have sub out RCA type connections. Dual end goes to each RCA in sub, you'll gain 6-4 dB depending on sub model

Is the side with the single RCA Pin a Mono or Stereo RCA Pin? (Will it carry L and R information or just mono information?)

I'm not sure, but Mediabridge Make the Cable for Left and Right Audio Output to Left and Right Audio Input. They say that these type of Cables can be used also to hookup a Subwoofer and will also improve the Audio portion of your system. I've did some research on Mediabridge Cables and they Build their Cables to produce a good Sound Output of whatever you have hooked up with them. I have two Polk PSW10 SUBS hooked up with these Cables and the Sound is Solid!. Ultimately when it comes to your System it's what you want to do. 🤔🤔😄😎

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Mediabridge™ Ultra Series RCA Y-Adapter (8 Feet) - 1-Male to 2-Male for Digital Audio or Subwoofer - Dual Shielded with RCA to RCA Gold-Plated Connectors - Black - (Part# CYA-1M2M-8B)

Mediabridge™ Ultra Series RCA Y-Adapter (8 Feet) - 1-Male to 2-Male for Digital Audio or Subwoofer - Dual Shielded with RCA to RCA Gold-Plated Connectors - Black - (Part# CYA-1M2M-8B)

Product ID: 1789094

Details

Brand
Mediabridge
Cable Type
Coaxial
Compatible Devices
Subwoofer
Connector Type
RCA
Special Feature
Braided

🔊Low-loss coaxial for deep bass

🔗Gold-plated connectors for tight fit

🛡️Dual shielding blocks hum/static

Description

🎧 Elevate your bass game—because your sound deserves the Ultra Series edge!

PLUG PLAY SIMPLICITY - Ready out-of-the-box with color-coded, flexible PVC jacket for effortless, professional-grade installation.
PREMIUM CONNECTION FIT - Corrosion-resistant gold-plated RCA connectors with split-tip pins guarantee a snug, reliable link every time.
EXPAND YOUR AUDIO UNIVERSE - 1-male to 2-male Y-adapter splits signals seamlessly—unlock immersive surround sound without extra cables.
ULTIMATE SIGNAL PROTECTION - Triple-layer shielding—braided copper, aluminum Mylar, and foam dielectric—eliminates interference for pure audio.
DEEP PRECISE BASS DELIVERY - Low-loss coaxial cable engineered for subwoofer frequencies ensures every beat hits with clarity and power.

The Mediabridge™ Ultra Series RCA Y-Adapter (8 Feet) is a high-performance audio splitter cable designed to connect RCA-enabled devices like TVs, subwoofers, and amplifiers. Featuring low-loss coaxial construction optimized for deep subwoofer frequencies, dual shielding to prevent hum and static, and gold-plated connectors for superior conductivity and durability, this adapter delivers pristine surround sound with a secure, easy-to-install design favored by audiophiles and home theater pros alike.

Specifications

ASIN	B00KCQSW3E
Best Sellers Rank	#113,666 in Electronics ( See Top 100 in Electronics ) #1,198 in RCA Cables
Brand Name	Mediabridge
Cable Type	Coaxial
Color	Black
Compatible Devices	Subwoofer, Amplifier, Speaker
Connectivity Technology	RCA
Connector Gender	1-Male, 2-Male
Connector Type	RCA
Customer Package Type	Standard Packaging
Customer Reviews	4.8 4.8 out of 5 stars (4,330)
Global Trade Identification Number	00813077015033
Included Components	8FT Black 1-Male to 2-Male RCA Cable
Indoor Outdoor Usage	Indoor, Outdoor
Item Shape	Round
Item Type Name	Mediabridge™ ULTRA Series RCA Y-Adapter (8 Feet) - for Digital Audio or Subwoofer - Dual Shielded - Black - ( CYA-1M2M-8B )
Item Weight	27.22 g
Manufacturer	Mediabridge Products, LLC.
Model	CYA-1M2M-8B
Number of Items	1
Number of Pins	1
Other Special Features of the Product	Braided
Outer Material	Polyvinyl Chloride (PVC)
Part Number	CYA-1M2M-8B
Recommended Uses For Product	connecting audio components, achieving surround sound audio
UPC	692533054478 692533059466 692533060462 692533050470 813077015033 692533063463 736856293401 692533043472 692533061469 692533039178 692533040471 692533053471 692533036177 795237265833 692533057462
Unit Count	1 Count
Warranty Description	1-year limited warranty

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