What is the difference between input and pass-thru?

Question

I have a Rockford Fosgate R500-1 amplifier with a Rockford Fosgate Punch 15" subwoofer P3 dual 4 ohm 600/1200W  but I don't understand the difference between input and pass-thru and also a phase button 180° or 0°  what is the best connection to make?? also on the sub, there are 2 + and 2 - and I only took one + and - closest to the terminal is this okay? here are so many questions for an old sound enthusiast for years but who admits to being a little lost  link to the amp http://www.rockfordfosgate.com/products/details/r500-1 link to the sub http://www.rockfordfosgate.com/products/details/p3d4-15  thank you!

baladur13 · Answer

Hello Input = amplifier input Pass-thru = are jacks (passed through) that allow sending the same signal as that in "Input" to another amplifier (Click on the image extracted from the manual (page 9) to enlarge it in a new tab)  Phase adjustment Translation of the manual (page 10) http://www.rockfordfosgate.com/support/rftech.aspx?kbsrc=http://rftech.custhelp.com/cgi-bin/rftech.cfg/php/enduser/std_adp.php?p_faqid=1046&p_li=&p_topview=1#knowledge Allows you to easily switch the output phase of the Amplifier between 0° and 180°. This has the same effect as physically swapping the positive ( + ) and negative ( - ) terminals of the speaker wires Some info on subwoofer settings https://www.configspc.com  For connecting the subwoofer, unless I'm mistaken P3D4 means we have 2 x 4 ohms. According to the manual http://www.rockfordfosgate.com/rftech/library/2011/5_Subwoofers/4020117-0_P3Subs-MAN_Rev3.pdf the wiring on the speaker should look like the image next to it. The amp requires a minimum of 2 ohms between the + and - terminals, so depending on the wiring done, you need to connect it as shown in the manual on page 9 (2 ohms). Very hard to catch a black cat &#128568; in a dark room. Especially when it's not there...

skiziofrag · Answer

thank you for your documentation which I spent quite a bit of time on that said I need good advice again should I take the + on one side and the - on the other for the sub? or should I take both + and both - to connect them to the terminal?  is it really in dual coil? I’ve understood the problem with the phase anyway, it's up to me to fix that by ear and for the pass thru and input I'm a bit lost even with the diagram!! I connected that to pass thru, but I don't know if that's correct at all and it bothers me because I don't want to break everything given the price of all this here's a fresh image

baladur13 · Answer

RE  You said that the impedance of your subwoofer is 2 times 4 ohms... So you need to connect a positive from the amp to a positive of the sub and a negative to a negative... (like in the picture) The connection of the coils corresponds to the drawing provided in my previous message.  Then you put your cables on thru pass... that should work, because for me, based on the diagram, the right input and right thru pass are connected to each other in the amp... same goes for the left input and left thru pass.  To be purist, the connection to the inputs would be more academic... In fact, if you plugged in another amp, you could send the same signal to it via the thru pass...   And for the phase, indeed, it's up to you to adjust it by ear to achieve the best sound. -- Very difficult to catch a black cat &#128568; in a dark room. Especially when it is not there...

Char Snipeur · Answer

Clearly, it makes more sense to connect to INPUT.  -- True submission is when slaves worry about the price of cotton. Char Snipeur

skiziofrag · Answer

thank you thank you I am very sorry to take your time and also I didn't explain myself well (that's my main flaw) for the connection of my sub I obviously took the + from one side and the - from the other as shown in your diagram but I was talking about inside the bass box I have 2 + and 2 - and I only took one of each, did I do it right? that shouldn't matter too much but as I said I don't want to break everything because I am a big fan of car sound systems  I would also like to know how or what is the purpose of having 2 ohms or switching to 4 ohms actually um I hope I made myself clear lol I think there is a link with the fact that it can be 500 watts or 320 watts thank you for your time and your responsiveness

Char Snipeur · Answer

If the amplifier delivers 500W at 2 ohms and the subwoofer in parallel supports 600W, there is no question to ask, the parallel connection at 2 ohms is good.  In series, the amplifier will probably deliver less power and should heat less. In a car, I don't see what can be done with that many watts! I would prefer the series connection. Unless you want to go deaf quickly and blow out the windows. -- True submission is when slaves worry about the price of cotton. Char Snipeur

skiziofrag · Answer

Okay, okay, so basically should I take apart the sub to see if I need to put one wire on the two positives and another wire on the two negatives inside the box? I mean, I'm talking about two wires for + and two wires for - from the sub to the terminal of the box, right, and not connecting the box to the amp I’m waiting for your news because since I have some issues with my setup, I prefer to wait and be sure I know if I need to disassemble the sub to necessarily add the missing wires because it's heavy all this Anyway, thanks for your quick response and for your time.

skiziofrag · Answer

it's the same on the other side  I am currently like this   a store is pointing me to it but I have some doubts which can be understood when you invest a nice sum of money like that   I hope I made my post well and that you will understand because it's not always easy to be understood in this crazy world

baladur13 · Answer

You told me earlier: the box only has two terminals, a + and a -  If there are 2 black wires and 2 red wires on the subwoofer, that means they are connected as shown in the drawing below.   The two black wires from each of the subwoofer's coils are connected to the negative terminal of the box and the two red wires to the positive one.  So we are completely compliant  In any case, there is no risk to be like in the drawing... the amp is designed for that.  Edit: where does the Chila audio drawing come from??? Your subwoofer is indeed a Rockford R3D4-15 dual voice coil of 4 ohms, while the Chila audio is a single voice coil..  It's very hard to catch a black cat &#128568; in a dark room. Especially when it's not there...

skiziofrag · Answer

Hello again so yes yes I do have the Rockford R3D4-15 dual 4-ohm voice coil set  I think that the 2 + and - terminals of the sub are connected because I just did it and I don't hear any difference, but it was better to test just in case!  And sorry for the image, I hadn't noticed that it was a single coil.

What is the difference between input and pass-thru?

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