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Hacking the Logitech Z5500
Hacking the Logitech Z5500
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Old 16th February 2013, 03:26 AM   #461
adman1091 is offline adman1091  Canada
diyAudio Member
Join Date: Jan 2013
Default Fixed!!

Nevermind I tinkered around inside a bit and now it is perfect.

For everyone else with a PID pre636 Z5500 sub, and do not want the speakers connected and are using the sub connected to an amp, THIS is the final solution.

If you want an all internal mod, ie you are going to use an RCA connector for the Sub signal (from pre-out) you have 2 options for powering up the unit.

Manual: you have to switch it on, or leave the power on.

Auto: Have an audio sensing circuit that activates a relay, turning on the sub, with a timing capacitor that shuts it off after a certain amount of time.

If you want manual switch, then solder the switch between 8v and white wire.

If you want always on, solder 8v to white.

If you want auto sensing, build this circuit
replace R6 with a 20k trimpot to dial in the sensitivity (i used 2k ohms)
replace C4 with 2200uF, replace R11 with 1M ohm (this will give about 8-9 minutes till it turnes off.)
Remove R12.

That circuit runs great with 8v. For the final connection on the relay, connect the two end to 8v and the white wire.

In all 3 varieties, you will have to either use a 5v voltage regulator, or a voltage divider to make 8v into 5v to the white wire for it to work best.

The final trick is to unsolder the grey wire and connect it to your sub input.
If you don't unsolder it, you will get the nastiest tone you've ever heard.

here is a reference board that is the same.
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

first set of solder points

second set

third set
speakers x5, sub, mute, nothing, power on, nothing

Final reference for wire colours: green is ground, red is 8v, grey is sub in, white is power on.

Hope this helps anyone else.

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Old 5th March 2013, 10:55 AM   #462
Busu83 is offline Busu83
diyAudio Member
Join Date: Feb 2013
I have a Z 5500 spring clip version. I try to conect the blue, white and the orange wire (puled out from the pream board) and conected to groud & pin 13 but no sound at all. I also conect the grey wire to signal sound and the groud of the signal to pin 13 at ground.
The amp go on but no sound only when i conect the white wire to ground. Any other ideea please?
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Old 5th March 2013, 04:51 PM   #463
alienated is offline alienated
diyAudio Member
Join Date: Feb 2013
I cant get mine to work. The Control unit died a while ago, so i ordered some RCA chassis connectors. After finally getting around to it, i checked this thread again and found that i had the same pid as the guy i quoted. However i cannot get it to work. Checked the pinout and its correct. 6,7,8 and 13 is grounded and 2 (grey wire) is soldered to the center.
Using an Onkyo 605, but there is no sound coming from the sub. When i touch the rca i get a small humming sound from it, so it appears to be on. What am i missing? :S

Originally Posted by Mortenhoe View Post
I started measuring from pins on the connector on the back, to the circuit board inside, and found out where pin 6, 7, 8 and 13 ended up. Then I soldered 4 wires on. I mounted an RCA connector in the back of the subwoofer amp plate, and soldered the 4 wires to ground. The I found out that pin 2, Sub In, was the grey wire in the wire bundle, so I cut that and wired it to the center of the mounted RCA connector.

And it worked! My Sony amp can turn up and down the volume on the subwoofer individually.

Now I'm thinking about modding even more. I'm trying to find out, how I could alter the frequency range. The woofer is playing to much of the sound spectre.(Yes, that probably not how you say it)
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Old 5th March 2013, 11:01 PM   #464
alienated is offline alienated
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Join Date: Feb 2013
Got it somewhat working. But its really really low. :S
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Old 13th March 2013, 03:05 PM   #465
uzibaron is offline uzibaron
diyAudio Member
Join Date: Mar 2013
Hi Rjaii,

I have the same issue - did you manage to fix it? if so, how?

Thank you
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Old 22nd April 2013, 05:24 PM   #466
Tobiasbrock is offline Tobiasbrock
diyAudio Member
Join Date: Apr 2013
Smile Doesn't this seem right to you?

Hey guys

Registered to this forum to get some help from the pros - cause I am most definitely not a pro.

So... Threw myself out in this sub-altering-business. Wanted to change my Logitech Z-5500 subwoofer to be able to work with my brand new AV-receiver from its "Pre Sub Out". I got together with a friend of mine who knows how to solder and stuff. We used this german walkthrough - although we don't know one word of german:

Originally Posted by beatinvasion View Post
I created a video in German. I show how the Z-5500 as remodels active subwoofer.
I made two more videos, I show how to modify the cable.

Here is the link: Hacking the Logitech Z 5500 Control Panel Problem - German - Aktiv Subwoofer umbau - Tutorials2k - YouTube

Have fun
Anyway, everything's done, but still: no sound! Nothing at all. We can hear a very tiny buzz when turning the sub on from the switch, but besides that, the sub is not sending out any sound.

Can anyone tell us from these pictures if we have done something wrong? I could really use your help!
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Old 28th April 2013, 09:13 PM   #467
calif94577 is offline calif94577
diyAudio Member
Join Date: Apr 2013
So last night my control pod decided to not work any longer. No lights, no anything. For the longest time I thought I had a power issue. Figured out my plug works fine, fuse is fine, and measured the pin outs with my multi-meter and am getting the right values so that means its the control pod, yet it acts like it is not receiving any power, and yes the cable to the pod is intact.

My question is, is there anyway to fix the pod... I haven't had a chance to turn it on yet since I don't have the right sized Allen key. Anyone have any advice on how to figure out what went wrong inside the pod and how to potentially fix it? Thanks a lot!!!
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Old 30th April 2013, 08:19 AM   #468
irv6744 is offline irv6744  United States
diyAudio Member
Join Date: Apr 2013
this is my question regarding a z-5300 which i am assuming is wired the same as the z-5500.

i soldered a jumper across 6-7-8 and 13 of the pod connector as is clearly shown and discussed in many other posts.

i connected a line from sub woofer out on my sound bar to a mono 3.5 mm connector into the sub/center input.

the sub does not pop when i turn it on and i hear no sound when i connect tot he sound bar.
the big heat sink gets a little warm.

if my z-5300 is the same as the z-5500, from what i read, i think (hope) that something should be happening that i could hear.

any ideas?
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Old 23rd May 2013, 09:56 PM   #469
mikemat is offline mikemat  Poland
diyAudio Member
Join Date: May 2013
Location: Poland
Hi all,

Can i user trigger with 12v from my Yamaha amplifier to auto turn on/off z5500 ?

I need only active subwoofer, without other speakers from Logitech system.

Now i must manualy turn On z5500.

My connection:
- RCA with audio signal: Pin 2(+) and 6,13(-)
- linked wires/PIN 7,8,13
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Old 28th May 2013, 03:33 AM   #470
dangus is offline dangus  Canada
diyAudio Member
Join Date: May 2004
Location: Vancouver Island
Hacking the Logitech Z5500
Maybe. To be safe, I'd try to use a relay or optocoupler for isolation.
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