Question 1

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?

Accepted Answer

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

Question 2

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

Accepted Answer

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.

Question 3

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.

Accepted Answer

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.

Question 4

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

Accepted Answer

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.

ASIN	B000KUA8G6
Antenna Location	For Smartphones or TabletsLaptop
Audio Driver Type	Dynamic Driver
Audio Output Mode	Mono
Battery Average Life	5 Hours
Best Sellers Rank	874 in Musical Instruments & DJ ( See Top 100 in Musical Instruments & DJ ) 2 in DI Units
Box Contents	Di400p Kompakte Direktbox mit Parallel
Brand Name	Behringer
Colour	Schwarz
Compatible Devices	Guitar, Bass, Mixer, Amplifier
Connectivity Protocol	XLR, P10
Control Method	Touch
Controller Type	Application
Customer Package Type	[Not Directly Mentioned]
Customer Reviews	4.5 4.5 out of 5 stars (2,130)
EU Spare Part Availability Duration	7 Years
Enclosure Material	Metal
Frequency Response	40 Hz
Global Trade Identification Number	00689076808385
Is Waterproof	False
Item Dimensions D x W x H	30.5D x 16.8W x 8.9H centimetres
Item Weight	0.51 Pounds
MP3 player	No
Manufacturer	Behringer
Maximum Speaker Output Power (in watts)	3000 Watts
Model Name	DI400P
Model Number	DI400P
Mounting Type	Tabletop Mount
Network Connectivity Technology	TRS, XLR
Number Of Circuits	1
Number of Audio Channels	2.0
Number of Items	1
Number of Power Levels	1
Power Source	Electrical Wire
Product Features	Amplifier
Speaker Size	4 Inches
Speaker Type	Multimedia
Specific Uses For Product	Portable device connectivity
Subwoofer Connectivity Technology	Wired
Subwoofer Speaker Diameter	4 Inches
Tweeter Diameter	1 Inches
UPC	689076808385
Unit Count	1.0 count
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology Type	No

Behringer Ultra-Di Di400p High-Performance Passive Direct Injection Box

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