Help a noob with DIY project - convert Logitech Z680 speakers to HT setup

[ShakenSoul]

Well, I don't want to give up on the speakers so soon and I am trying a last ditched effort to give life to them.

A short background the subwoofer started crackling which gradually increased till it became impossible to watch a movie with the constant noise from the woofer. Initially my impression was that the driver had gone kaput for which I had raised a few queries here on the forum

http://www.hifivision.com/speakers/944-where-repair-subwoofer-delhi.html

http://www.hifivision.com/speakers/9365-suggest-replacement-8-subwoofer-speaker.html

I was under the impression that the driver would need to be replaced and started looking for an alternative. A friend offered to recone the driver which I promptly accepted and dispatched the driver for repair. Initially he could not detect any fault in the driver when he tested the driver in an enclosure, I asked him to check thoroughly to make sure that the driver was okay or it was dying. Meanwhile I ordered a replacement Dayton woofer from US which a friend was kind enough to carry it to India. To my disappointment, even after installing the new driver, the crackling sound was still there. So I understood that the amp board was the culprit. Frustrated, I decided to open the woofer to check for any blown capacitors or anything I could detect with my eyes (I also try my hands with amateur DIY jobs). I could detect nothing wrong in the amp board, infact I broke a very small capacitor while trying to put the sub back. I resoldered it, but to my dismay there is no sound from the woofer now, but the crackling noise is still there. :sad:

Unable to locate any professional servicemen to repair the woofer, I am thinking about converting these speakers into 5.1 HT setup with a receiver. The satellite speakers, subwoofer enclosure and driver are all working, I only need to convert the Logitech Z680 subwoofer into a passive or active subwoofer to be able to connect to a receiver which I am planning to buy. Later I will upgrade the speakers to something better.

I need guidance how to complete this DIY project, I am a complete noob in terms to technical jargon. I can only follow instructions which I am hoping my fellow hifivisionaries will be kind enough to provide. If there is any shop in Delhi where I could get this done, I am more than willing.

This is my last effort to save the speakers, they have served me well for the past couple of years, but they died before they could reach their peak and I am hoping to revive them again before upgrading.

Thanks for reading and please pour in your suggestions and comments.

 

[NetFreak]

What is the impedance of speakers?

Since receivers require Active sub, you will have to purchase or DIY a plate Amp to power this sub.

I did something similar to use passive sub + speakers from HTIB with Yamaha receiver. Speaker impedance should be at least 6 ohms.

 

[ShakenSoul]

Thanks for replying.

I think the impedance is 8 ohms. I wanted to keep the sub passive as of now if possible by disconnecting the amp completely from the subwoofer and use only the driver in the enclosure.

The manufacturer specifications of the speakers

Total output power: 505 Watts RMS
Subwoofer power output: 188 Watts RMS
Satellite speaker power output: 317 Watts RMS (62 Watts RMS per channel for satellites; 69 Watts RMS for center channel)
Total peak power: 1000 Watts
Maximum SPL: 114 dB
System frequency response: 35Hz - 20kHz
Input impedance: 10,000 ohms

However based of user postings on the internet, it seems that the sub uses this driver http://www.tb-speaker.com/detail/1208_03/w8-670q.htm

and the satellite speakers use this driver http://www.tb-speaker.com/detail/1208_03/w3-594sb.htm