I have a pair of Advent 5012s, basically the third version of the large Advent speaker, from maybe the late 1970s. The midrange is great. The treble is a little thin. The bass is pretty weak. What can I do to improve the situation?
The Advents were refoamed recently, by an expert. They are on the floor, and in front of a fairly thick rug. The system is in my living room, which is maybe 12 x 20. With the rug, the couch, and curtains, it's a fairly sound-absorbent space. I mainly watch movies, but also listen to CDs. I like classical, jazz, and classic rock. I want better bass in my music. I don't watch action movies, and I don't care about movie sound effects. I listen at moderate volumes. I live on a busy street, with some street noise.
The Advents are driven by a Marantz NR1403, a 5.1 AVR with 50w per channel at 8 ohms. Having AM/FM is nice, but not required. Only the two Advents are connected. I have no plans or desire to add surround speakers. I like the convenient HDMI switching on the AVR, but it's not required. The source is an Oppo BDP-103 BluRay player. I have fiddled around with the various sound options on the Marantz, including just turning up the bass. It just doesn't sound all that great. I have also moved the speakers around, including pushing them back against the wall.
I'm willing to spend say around $500. Options include a) opening up the Advents and replacing the capacitors, b) replacing the Advents, c) buying a subwoofer, d) buying a power amplifier and using the Marantz as a preamp only, or e) replacing the Marantz with another AVR, a preamp + amp, an integrated amp, or a stereo receiver. If I replaced the Advents, I could get maybe $200 for them. If I replaced the Marantz, I could also get probably $200. So you can figure in the extra 200 in those cases.
What would you recommend?