Question 1

what is a3.5mm jack?

Accepted Answer

A 3.5mm jack is an audio jack, often used with, but not limited to, headphones. Sometimes used as an auxiliary port on various electronics. The Imperial measurement is 1/8 inch or 1/8". The jack is the female end. The plug is the male end.

Question 2

Do these cut out lower frequency (crossover) to the speaker when a subwoofer is connected?

Accepted Answer

Yes, internal non-adjustable crossover applies when rca  cable is plugged into klipsch rear sub out.

Question 3

is this one speaker or a pair ?

Accepted Answer

It’s a pair and the speakers are great.

Question 4

I just bought this set and they are great but can i hook them up to a receiver?

Accepted Answer

YES, OF COURSE you can hook them up to your receiver. Look for a "line out" RCA posts that match the speaker's "phono" they call it, but be sure to flip the switch to "line level". Phono is for phonograph. Yes, Seriously. It's more sensitive because a stylus doesn't put out much energy. So if it sounds like garbage, check that the switch is correct. If your receiver has a line output, you can hook these to it, no problem. The amp without speakers can't use any power, so no worries.
    If you have a TV with no line out, buy an optical to line out box. They're very tiny and use a 5 volt power supply and they convert your audio from optical to line level audio. Then just patch that to your speakers. What's odd is that each speaker has a left and right input. That's because it's like other USB speakers. You can hook them up in different ways. One is to hook one wire from your left white RCA to your left speaker and another cable from your receiver over to your right red RCA plug on the other speaker, or whichever way you've got it. Mine are this way.
   You get much better sound with amplified speakers and they explain why very well in this page. Speaker's reproduction is usually pretty awful, even if you think they sound pretty good, if it's even 3db louder at 1khz, this means you're going to hear 1khz pitch TWICE AS LOUD.  SO, +/-3db as you see on specs all the time, that's horrible. I didn't know this until I got good powered speakers. "WOW, I can hear everything." 
They've taken the peculiarities of the speaker and then corrected them in the amplifier.
   Plus since there are always losses when sending power on long lines, having the amp only a few inches from your speaker is good. It's like those tiny jump starting batteries. I have one. The wires aren't big but they're really short and it will crank my 4.0 liter engine without problems whereas with a set of battery cables with wires many times larger, it will not turn over.
   Whatever you do, if your TV does not have audio line outs, be sure to write your TV manufacturer a nasty letter for leaving off the line out audio connectors on their lousy TVs. Don't forget. It's so bad.
   The optical to line level audio, it's full blast and it doesn't respond to the level with your remote. It can even be muted but it's full blast out of the converter. Who would make an expens LED TV and NOT provide line outs?  LG. Terrible. Poor design. You tell 'em.
    So what do you do? You buy a Google TV box. Hook that to your internet and you stream your video in that way and the audio is simple to control with any Google TV remote. I like the Rii remotes. They have a touchpad on it and a little keyboard. The keys are backlit so you can see them in the dark.
    Putting studio monitors on my TV was a great decision. Getting a BBE Sonic maximizer for my TV was just as great. Really brings it to life.
    BTW, I found a really nice subwoofer RCA cables on Amazon and got 2, so I could hook each speaker up. Those crummy little patch cables are fine for 6" between components, right? but for 6 ft? ... not so good. These subwoofer RCA cables are very well built. they'll last you. And, It's a lot like my jumper cable analogy. The larger wire preserves the sound quality and quantity.
     Remember, "If all else fails, read the directions".

ASIN	B07FKCP7PZ
Additional Features	USB Port
Age Range Description	Adult
Antenna Location	For Computers, For Smartphones or Tablets, For Televisions
Audio Driver Size	5.25 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Best Sellers Rank	#22,041 in Electronics ( See Top 100 in Electronics ) #51 in Bookshelf Speakers
Bluetooth Range	10 Meters
Brand	Klipsch
Built-In Media	2M USB Type A to Type B cable, 2M power cord (region specific), 4M speaker wire with soldered tips, Remote control (with 2 x AAA batteries), Rubber feet
Color	Black
Compatible Devices	Cell Phone, Personal Computer, Television
Connectivity Protocol	Bluetooth
Connectivity Technology	wired, wireless
Control Method	App
Controller Type	Remote Control
Customer Package Type	FFP
Customer Reviews	4.6 out of 5 stars 2,539 Reviews
Enclosure Material	Aluminum
Frequency Response	21 KHz
Global Trade Identification Number	00743878036336
Input Voltage	240 Volts (AC)
Is Waterproof	False
Item Dimensions D x W x H	8.5"D x 7"W x 13"H
Item Type Name	Klipsch R-51PM Powered Bookshelf Speaker (bluetooth)
Item Weight	10.6 Pounds
MP3 player	No
Manufacturer	Klipsch
Maximum Range	100 Meters
Model Name	R-51PM
Model Number	R-51PM
Mounting Type	Plug Mount
Number Of Circuits	4
Number of Audio Channels	2.0
Number of Batteries	2 AAA batteries required.
Number of Items	2
Power Source	Battery Powered
Speaker Maximum Output Power	120 Watts
Speaker Size	5.25
Speaker Type	Monitor
Specific Uses For Product	Gaming, Home Audio
Subwoofer Connectivity Technology	Wired
Total USB 2.0 Ports	1
Tweeter Diameter	1 Inches
UPC	743878036336
Warranty Description	2 year parts & labor
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth
Woofer Diameter	5.25 Inches

R-51PM Powered Bluetooth Speaker,Black

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