Well I got the idea from another thread that seemed to not go anywhere. Lots of LX450 owners were interested in the replacement but the shop that was doing it seemed to not care about responding to requests for pricing or anything else about it.
I had a fellow friendly mud member send me a PM with what he thought was the speaker being used by the not responsive vendor. Tang Band W4-1720 4" Underhung Midbass Driver
For $46 I ordered it and figured if it was not the right one I would only be out $46. A week later the part was in my hand and it looked good, nice dome and big magnet. Well put together and much nicer looking than the paper Pioneer that was in it from the factory.
The person that PMed me the link said they had talked to the vendor and there hold up on selling them was the plug for the speaker. So I was ready to cut and solder if needed when I installed it.
This last weened I gutted my LX450 to fully clean out all the old owner and there smell. In the process I removed the factory sub box and Sub.
Sorry for the lack of pictures I was trying to get this interior out/cleaned and back in in one day.
So a side by side comparison.
Remember how the friendly mudder said he talked to to vendor and they were trying to get a plug to make the new speaker plug and play........and that was the reason for the delay............well it already is plug and play right out of the box.
All I needed to do to fit the speaker was trim off the two plastic tabs in this picture. Notice the factory wiring making this speaker a true plug and play. I also removed this foam seal (pictured) and replaced it with double sided foam tape. I then bolted it all back in and repainted the speaker grill.
I powered it up on the stock stereo just to make sure it was producing sound. I'm in the middle of replacing all the speakers with Polk 6.5's and a Pioneer double din deck with a Alpine 4x 75watt amp for the doors and will run a small 100W sub amp to this sub.
I will report back once I have the rest of the stereo up and running.
Sorry for the lack of pictures I was in a rush trying to get the interior all back in......did not in the end.
Hope this helps other mud members take on this very easy upgrade. I would say this is easier than replacing the door speakers. It should also make some decent sound once done.
On a side note I do not think any replacement will make stellar sound without replacing the factory amp with something a bit better.

I had a fellow friendly mud member send me a PM with what he thought was the speaker being used by the not responsive vendor. Tang Band W4-1720 4" Underhung Midbass Driver
For $46 I ordered it and figured if it was not the right one I would only be out $46. A week later the part was in my hand and it looked good, nice dome and big magnet. Well put together and much nicer looking than the paper Pioneer that was in it from the factory.
The person that PMed me the link said they had talked to the vendor and there hold up on selling them was the plug for the speaker. So I was ready to cut and solder if needed when I installed it.
This last weened I gutted my LX450 to fully clean out all the old owner and there smell. In the process I removed the factory sub box and Sub.
Sorry for the lack of pictures I was trying to get this interior out/cleaned and back in in one day.
So a side by side comparison.
Remember how the friendly mudder said he talked to to vendor and they were trying to get a plug to make the new speaker plug and play........and that was the reason for the delay............well it already is plug and play right out of the box.
All I needed to do to fit the speaker was trim off the two plastic tabs in this picture. Notice the factory wiring making this speaker a true plug and play. I also removed this foam seal (pictured) and replaced it with double sided foam tape. I then bolted it all back in and repainted the speaker grill.
I powered it up on the stock stereo just to make sure it was producing sound. I'm in the middle of replacing all the speakers with Polk 6.5's and a Pioneer double din deck with a Alpine 4x 75watt amp for the doors and will run a small 100W sub amp to this sub.
I will report back once I have the rest of the stereo up and running.
Sorry for the lack of pictures I was in a rush trying to get the interior all back in......did not in the end.
Hope this helps other mud members take on this very easy upgrade. I would say this is easier than replacing the door speakers. It should also make some decent sound once done.
On a side note I do not think any replacement will make stellar sound without replacing the factory amp with something a bit better.
