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Old 11th January 2012, 08:23 PM   #371
fluxarc is offline fluxarc  Canada
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Join Date: Oct 2011
Location: Calgary, Alberta
Thank you Toffmonster! Your help has been truly instrumental. I performed essentially the same mod you made (because my unit is exactly the same) but in a different way. I will summarize below so that anyone else can perhaps follow my procedures as I think it's significantly easier to solder.

From what I have gathered, there are three different varieties of Z-5500's. The RCA version, the early spring-clip version, and the late spring-clip version (PID 636 and greater, including the rolled over numbers made in recent years with PID's 001 - 200). If you have the late spring-clip version, buy a bypass cable on eBay and be done with it. If you have an early spring-clip version such as I do (PID R608), then buy a bypass cable on eBay and be prepared to do some soldering.

I found this post and this post very helpful in understanding what it is you have to do. What I did is solder from the +8V feed to the orange wire (pin 8) followed by a 100 ohm resistor connected to the white wire (pin 7). This basically supplies +8V to the orange wire and +5V to the white wire (+2.5V under load).

I'm hoping there isn't any long term negative effects in supplying +8V to the orange wire; if there are, I'm assuming it will only damage the center channel. I suspect though that the control unit supplied +8V to both leads as that is what it was fed. In any case, this makes the soldering much easier and allows you to make only three solder points on the board, which significantly lowers the risk of damaging any components or the board.

I've attached pictures of my board to make sure whoever is trying this has the exact same board. I have also attached a picture of the board after the modification. I wrapped it in electrical tape and tucked it away after I took the picture. Good luck!
Attached Images
File Type: jpg Before1.jpg (377.5 KB, 639 views)
File Type: jpg Before2.jpg (376.5 KB, 574 views)
File Type: jpg After.jpg (388.4 KB, 556 views)
File Type: jpg Mod.jpg (326.1 KB, 549 views)
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Old 12th January 2012, 10:38 AM   #372
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Do you have an idea how to get rid of the high-pass filter in the Z-5500 for example, the two rear channels?
I wanted to hook up the speakers full range, but unfortunately the original connection they do not fulfill their role.
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Old 12th January 2012, 12:07 PM   #373
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Quote:
Originally Posted by scooby117 View Post
Do you have an idea how to get rid of the high-pass filter in the Z-5500 for example, the two rear channels?
I wanted to hook up the speakers full range, but unfortunately the original connection they do not fulfill their role.
You can bypass the three opamps on the left on the preamp board (as on the upper picture) with five wires (the upper one is the rear chan, the middle is the center chan and the bottom one is the front chan). Idealy you will have to remove the three opamp. But these five high pass filter should not be resposible for the final high cut off frequency. You will have to test it to know (maybe one more filter could be in front of each chan power amp tda7294).
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Old 14th January 2012, 09:04 PM   #374
fluxarc is offline fluxarc  Canada
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Join Date: Oct 2011
Location: Calgary, Alberta
Hey guys. I acquired another Z-5500 (late spring-clip version). The front-left channel is much quieter than the other channels (about 20dB quieter!). If I turn the other channels way down (through my computer soundcard) I can still achieve high volumes from that front-left channel, but again, the other channels are turned way down.

Any ideas what this could be and how I could fix it? Thanks in advance!
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Old 17th January 2012, 02:46 PM   #375
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Join Date: Sep 2011
Quote:
Originally Posted by fluxarc View Post
Hey guys. I acquired another Z-5500 (late spring-clip version). The front-left channel is much quieter than the other channels (about 20dB quieter!). If I turn the other channels way down (through my computer soundcard) I can still achieve high volumes from that front-left channel, but again, the other channels are turned way down.

Any ideas what this could be and how I could fix it? Thanks in advance!
By me there are three options:
1. Falling out jack, badly inserted, etc.
2. Defective operational amplifier U13
3. Damaged Cirrus Logic in Control Panel
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Old 18th January 2012, 02:46 AM   #376
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Quote:
Originally Posted by Toffmonster View Post
A small addition to my previous posts. Took some pictures of my PCB and checked what pins orange and white cables lead to. It appeared the orange cable that turns my center speaker on is pin 8, while the white cable that turns the amps on is pin 7. So it's just like the thread said in the beginning, Pin 7 is On. But in my case Pin 8 isn't Mute but Center On.


Looks rough, but it works.
Hi,
Now that my pod has finally died, i have no choice but to follow ur guide cuz i have the same pcb in the sub. i gave the white wire 5v and im getting that buuuuuuu sound. I do not have the ebay bypass cable and the db15 schmatics has wrong number on it you posted. This is where im stuck. ive hook up all speaker to a receiver and i cant get the sub workin. Ive tried different combination on db15 connecter but nothing.

any help will appreciated
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Old 18th January 2012, 03:03 AM   #377
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Join Date: Aug 2011
Quote:
Originally Posted by fluxarc View Post
Thank you Toffmonster! Your help has been truly instrumental. I performed essentially the same mod you made (because my unit is exactly the same) but in a different way. I will summarize below so that anyone else can perhaps follow my procedures as I think it's significantly easier to solder.

From what I have gathered, there are three different varieties of Z-5500's. The RCA version, the early spring-clip version, and the late spring-clip version (PID 636 and greater, including the rolled over numbers made in recent years with PID's 001 - 200). If you have the late spring-clip version, buy a bypass cable on eBay and be done with it. If you have an early spring-clip version such as I do (PID R608), then buy a bypass cable on eBay and be prepared to do some soldering.

I found this post and this post very helpful in understanding what it is you have to do. What I did is solder from the +8V feed to the orange wire (pin 8) followed by a 100 ohm resistor connected to the white wire (pin 7). This basically supplies +8V to the orange wire and +5V to the white wire (+2.5V under load).

I'm hoping there isn't any long term negative effects in supplying +8V to the orange wire; if there are, I'm assuming it will only damage the center channel. I suspect though that the control unit supplied +8V to both leads as that is what it was fed. In any case, this makes the soldering much easier and allows you to make only three solder points on the board, which significantly lowers the risk of damaging any components or the board.

I've attached pictures of my board to make sure whoever is trying this has the exact same board. I have also attached a picture of the board after the modification. I wrapped it in electrical tape and tucked it away after I took the picture. Good luck!
How to get "sub in" connection if you dont have ebay bypass cable. ive tried the 6,7,8 to 13 ground but still no sound from the sub. any help would appreciated
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Old 18th January 2012, 09:50 PM   #378
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Originally Posted by zombieryder View Post
How to get "sub in" connection if you dont have ebay bypass cable. ive tried the 6,7,8 to 13 ground but still no sound from the sub. any help would appreciated
nevermind got it done. Now how to control the volume and the humming
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Old 21st January 2012, 10:46 AM   #379
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Join Date: Jan 2012
Hello guys. This thread has been truly inspirational! I'm very thankful that it's even possible to find this much information about hacking the Z5500.

I'm in NO WAY an audio geek. I have almost no knowledge what so ever in this field. I'm an electrician and I also like working with computers, inside and out.

At work someone told me they found a speaker in a house that had been auctioned away, and it was to be thrown out. I looked at it, and it was the subwoofer/amplifier from the Z5500 system, and it looked to good to be trashed.

I took it home, and thought it might be usable, but no. There was no control pod.
Then after some googleing i find you guys!

Now. What to do. My plan was making this into an active subwoofer, that would work together with my Sony 5.1 amp. It's got a preamp phono jack out, for subwoofer connection.
One of you had reverse engineered the pinouts, so it made the job quite easy.

I'm an electrician, so I have testing tools. 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 24th January 2012, 01:33 PM   #380
demck85 is offline demck85  United States
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Join Date: Jan 2012
Default pioneer vsx-921-k to logitech z5450 subwoofer

I've seen some great progress on this thread. I was wondering if anyone would be willing to make the cable to connect a Pioneer VSX-921-K sub out (RCA) to the logitech z5450 subwoofer. I have the front Left and Right connected to the receiver now, but I wanted to repurpose the subwoofer. One of the rear wireless speakers died (red flash, has the bad resistor in it..i think), so I'm looking to repurpose parts of the the unit.

I'm willing to PayPal some money once I see that it works.
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