best, smallest combo < 35 lbs that can project true bass freq at house jam volume (congas)

Fender Rumble 100 should fit the bill nicely.

 

GK MB112-II might work.

 

The Rumble 150 is a now-discontinued older design that is a decent, but not superb combo.
The new series Rumble 100 or Rumble 500 are both superb amps - the best-of-the-pack at their respective price points.

 

The Rumble 150 is discontinued, so you’ll have to check out the used market for that. Traynor and Peavey are thin on the ground in my neck of the woods, so I don’t know much about them. I have some experience with larger EBS rigs, but don’t know how it translates to the smaller combos, though I do find the EBS tone a little sterile myself, but YMM, as always, V.

 

The Rumble 100 is a wonderful, ballsy sounding amp at a great price.

 

I use a Rumble 100, it’s a great amp. The only amp I’ve considered replacing it with is a MB 112.

the Rumble keeps up with cajon, Marshall 12” tube combo, and PA . I Only use a line out on 50% of gigs. It’s bassy- if anything too bassy! I usually cut bass to 9:00, sounds great that way.

the appeal of the GK is clarity, and headroom- but I’ve been very happy with the Rumble, no rush to replace it.

 

I have a Traynor SB115 which I purchased in February. It has become my main gigging amp for 80% of my gigs. around 31 lbs, 200 watts and a 15 inch speaker. I did have to play around a bit to get my sound. The SB115 is plenty loud for its size.

 

Quilter BassDock 10 and BB800 will do it. Amp doesn't have a aux in, though.

Or the Acoustic Image Doubleshot.

TBH, I don't think you're going to get the low end you're looking for out of a small, budget Fender or Peavey combo.

 

You must be either joking or misinformed if you are characterizing the Rumble 100 this way: the Rumble 100 has a VERY strong low end.

 

I'm sure the Rumble works for many people, and may even be a good fit for the OP. But his reference cab is a Hather 1203 which is a pretty high bar. Despite the situation being without drums, when things get rowdy I would not want to be limited to a 100 watt combo, even a "good" one. JMO.

 

Fender 800c.
39lbs, 800 watts, cab sims.

Whatever rig you end up with, add an adjustable HPF to your signal chain for speaker protection, to cut the mud and get better dispersion. Also put it up on a stand or add a tilt back pad so it points at your ears to better control your tone. See my TB Wiki for more HPF info.

 

To the OP: here's a good demo of the Rumble 100. Bassist is using a 5 string, which gives a good indication of how low the amp will go without farting out. And it has both an XLR line out and a headphone jack for bedroom practice - a big plus.

 

I owned the original EBS Classic Session 60 combo amp for a while. (There is now a second generation, with the same name.)
Compared to the Fender Rumble 100, the Session 60 has a much more "cube shaped" form factor and is alot heavier. It uses a sturdier cab and has (as far as I know) a conventional transformer and a class A/B output section.
Preamp is flatter voiced (works fine with acoustic guitar!), has an innovative eq and a better aux function with full stereo, separate gain control and good headphone amp. The session amps also has a DI placed UPSTREAM of the master volume, instead of the stupid Rumble design where effect loop and line out are POST master volume.

That said, for some bassists, the Rumble might be more tempting. It is lighter, has a 12" instead of a 10", has a faliliar voicing and has simpler controls.
For me, the greater flexibility and more though through design makes the EBS a better option.

Please note that the current generation Session 60 is lighter than the first, and supposedly louder, too.

 

The video will NOT reveal how the speaker sounds, or if it might fart out! At 100 seconds, he clearly says "we are going direct from XLR to ProTools".