Does this work for connecting the sound output from a PC or MP3 player into a PA system using a Stereo 1/8" TRS to Mono 1/4" TS cable?

Yes that should be fine! :) You would also need an XLR to connect the DI Box to the PA.

I want to record digital piano and play live at church. Should I get Pyle-Pro PDC21 for $8 or is this significantly better?

A normal DI box is $50 so I wouldn't go too much lower than this. These seem to work well. I've only had one go bad in the past year or so and I purchased like 8 for my church.

Can this reduce a speaker level signal to a line level signal? E.g. if I wanted to take a speaker level and connect it to a mixer.

YES. The other answers are not accurate. This device as well as many other DI Boxes can make a Line Level 'copy' of the high power signal going to a speaker. This is a common use however this yes comes with a major caveat. The source (1/4 " INPUT) can be a highly amplified signal, such as the speaker output of a 100W guitar amplifier. The output signal (XLR OUTPUT) will be what the mixer wants (Line Level). CAVEAT: There must be a load connected to the THRU (Parallel OUT on this device). This load can be a speaker or speaker load simulator, basically what you would normally connect to the amp. Without a load connected, no signal flows and nothing will be output. Worse yet, without a load connected, many amps will fry. Amp to DI box to Speaker(1/4" OUT) and Mixer (XLR OUTPUT) is commonly used by guitarists. This allows the PA Mixer or Recording Audio Interface to get all the good sound that the guitar signal chain has built, only missing coloring from the speaker cabinet. If needing your speakers to be silent while still getting a good output on the XLR, adding a decent amp Attenuator or Load Simulator after the DI Box can reduce the power reaching the speaker to or near zero. Note: Many higher end Attenuators and Load Simulators have a built in DI Box.

can i use this to hook up my 6505+ to my m-box?

If you have the combo version, it has an XLR out already, so no DI required. The head version doesn't seem to have this option, so you could use the preamp out, but I'm not sure if you could hear a difference between using a DI or running the 1/4" into the line level input of the M-Box. You'll lose the tone you get from the power amp tubes either way. The main point of a DI is to convert a 1/4" instrument signal to a balanced XLR signal if you're going into a stage snake. Effectively running a 50' or 100' 1/4" cable will generally introduce noise and reduce signal quality, so the DI is a great option. I've used this passive DI box in live situations for the past year, and it's worked like a champ. I run my tracks (from an iPod) through it.

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🎤 Elevate your sound game—connect like a pro, perform like a legend!

COMPACT LIGHTWEIGHT - Weighing just 230g and measuring 30.5 x 16.8 x 8.9 cm, it’s the ultimate portable DI box for on-the-go pros.
NOISE FREE PERFORMANCE - Eliminate hum and buzz instantly with the built-in Ground Lift switch—perfect for professional setups.
VERSATILE CONNECTIVITY - Seamlessly link instruments to mixers, amplifiers, and sound desks for flawless stage or studio use.
POWERHOUSE COMPATIBILITY - Connect directly to speaker outputs delivering up to 3,000 Watts without compromise.
STUDIO GRADE SIGNAL CLARITY - Experience pristine audio with the BEHRINGER OT-2 transformer’s ultra-flat frequency response.

The Behringer DI400P Ultra-DI is a professional passive direct injection box designed for flawless impedance and signal matching. Featuring the renowned BEHRINGER OT-2 transformer, it delivers ultra-flat frequency response and can handle direct connections to speaker outputs up to 3,000 Watts. Its Ground Lift switch ensures noise-free audio by eliminating ground loops, making it an essential tool for both stage and studio environments.

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TrustScore 4.5 | 7,300+ reviews

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Recommended uses for product	For Smartphones or TabletsLaptop
Compatible devices	Sound Desk, Amplifier, Mixing Console
Surround-sound channel configuration	2.0
Colour	Schwarz
Included components	Di400p Kompakte Direktbox mit Parallel
Product dimensions	30.5D x 16.8W x 8.9H centimetres
Item weight	0.51 Pounds
Is waterproof	False
Number of items	1
Control method	Touch
Wireless communication technology	No
Speaker size	4 Inches
Power source	Electrical Wire
Item model number	DI400P
Material Type	Composite
Country Produced In	china
Colour Screen	No
Item Weight	230 g

Behringer DI400P Ultra-DI Passive DI Box

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