I put my Netgear router in my media console drawer
Married, eh? : -)
there is a concrete wall and a door between the two
So what's really going on here?
Despite being buried it sounds like the router is doing fairly well? Except for all the stuff on the other side of the wall?
You sound like you know what you're doing but you don't tell us a lot,
"too close to the router to be beneficial"? Are you thinking the two boxes are competing with each other?
What are your Internet subscription speeds?
You may have already but, if not, grab your very best laptop, load one of those free WiFi analyzers onto it, look at signal levels and run speed tests from various vantage points around the house.
Start close, connect to the main router with a wire, speedtest, then same laptop over 2.4 GHz and 5 GHz. Then move the laptop around testing 2.4 and 5.
When you get to the other side of the wall try a couple more wired connections (to the extender) as well as wireless.
What are we learning? Does the WiFi analyzer show any channel conflicts with your neighbors? Does the data support your hypothesis? Is the signal to your extender too weak? Or, too strong (as you implied when you said the boxes were too close)? What speeds are you getting?
Is your bridge connecting to your router over both bands or have you force fitted it to one band? Which band?
Here's a couple wild butt guesses;
- First my assumptions based on your OP;
- Stuff on the router side of the wall is running ok?
- Stuff on the extender side of the wall is running crappy?
- WAGs:
- Double check for channel conflicts (especially over 2.4 GHz.) with neighbors
- Because you are using the EX7000 as a bridge you don't have to worry about WiFi ranges overlapping, in fact the stronger the better. What did your tests show as best for the room on the other side of the wall? 2.4 or 5? Connect your bridge on that one. (Concrete wall? Probably 2.4 GHz. Don't know your Internet speeds but 2.4 will probably limit you to about 75 Mbps.)
If you're still thinking signal level / antennae you can test that by moving the router out of the cabinet and running your tests again. (Too bad you already bought such a nice router, some wives will tolerate the looks of an Asus Blue Cave : -)