Best Sounding Adapter - Making RCA into Banana or Spade? Thanks!

Line level converters are super simple to build even with super basic soldering skills. Get a little plastic box off Amazon, a set of speaker binding posts (4 total), a set of female rca connectors (2ea), 1K 1/4 watt resistor (2ea) and 10K 1/4w resistor (2ea) and a pinch of wire. Drill your holes in the case, mount your rca and binding posts, then solder the 1K resistor across ground to + on the rca. Next wire the - binding post to the ground rca, then finally connect the 10K resistor from + binding post to + rca connector. Taaadaaa, you built a fantastic line level converters. Basic binding posts and rca will give great results, but upgrading to WBT or my favorite being KLE connectors, you’ll get even better performance. All in all, basic setup should be $30 and an hour of time. When I ran converters, I even did away with the binding posts and just hot glued the speaker cables into the case and wired straight to the rca.

Also on these, since it’s all 1/4w resistors, there is no extra power draw from your amplifier so unless you’re running a flea watt amp, there’s no worries about headroom. And if you need to lower the signal even further, just up the value of the + leg resistor from 10K to 15K, 20K etc until you get the value where your sub blends using 40-50% volume. I tried loading a photo but it's not wanting to cooperate. Sorry.

Hope this helps,

-Lloyd

No dialogue here.

All I hear are crickets😂

In my car stereo days, we referred to these genercially as "high-to-low-level adapters".  Speaker level in.  Line level out.  Depending on your level of persnicketiness, you can find these at a variety of price ranges.

Another consideration here is that you have a single RCA cable and your amp has left AND right channels.  While bass is generally summed to both channels, you can take your pick of left OR right. You may want to look for a "summing" adapter if you want to make sure you capture all the bass information.  Probably overthinking this a bit, but just throwing it out there IF it matters to you.

As far as termination on the amp end is concerned, it may depend on you amp.  IF your amp has speaker A and B connections, then connecting to speaker B will give you a wide range of connection options.  IF your amp has speaker A only, then. you will be joining other speaker connections which may make the connections more challenging.  If you are using bananas, for example, adding more bananas is certainly above my pay grade.  But, generally, raw wire is best, but takes a little more time a patience to get it right.

Thank you to everyone who has kindly shared their thoughts - much appreciated!
I’m certainly learning and appreciate the insights and caution too. My rig is:

Integrated Amp - Unison Research "Unico" (Gen. 1 with the IR remote).
It has speaker outputs and a "Tape" RCA output.

Home Theater / Audio Tower Speakers - Definitive Technology BP2000.
Bipolar, so same speakers back and front, plus a 13" 300W sub-woofer.
Each tower has three pairs of binding posts - ’Low,’ ’Medium’ and ’High.’
The ’Low’ / sub woofer also has the RCA input option.

Currently I use one set of speaker cables from the integrated amp to the ’Middle’ binding posts of each speaker. Then jumper cables from the ’Middle’ to the ’Low’ and ’High.’

Q1. Can the "Tape" RCA output connect directly to the sub-woofer RCA input?

Q2. If "Yes" to Q1, is this typically better sounding than the jumper cable set up?

Q3. Does bi-wiring or tri-wiring speakers sound better than all the above?

Thank you in advance for your thoughts! :-)