Active Subwoofer hookup...?

[David Pipkin]

Hi,
Drummer for 40 years and new to bass and very new to the forum, so please forgive if this is obviously not possible.
Inherited a Martin Logan Grotto active sub from my brother, as well as his '62 ReIssue Fender Jazz bass and wondering if I can somehow combine the two. I know it's possible to add an external jack to an existing amp that doesn't already have one. I've got a relatively cheap Fender Rumble 25 I can experiment with. 25 watts, 8 Ohms. Thought it might sound better to combine the two somehow? The sub specs say "RCA Line Level in 20,000 Ohms. Compatible with 4,6, or 8 Ohm rated amps..."
Would it just pick the proper ohms automatically and would it even work in any way to begin with? I know you can't add an external cab that's less ohms, and I know you usually add an external cab and don't use the original, but thought there may be a way to use both.
Miss playing drums but love learning the bass, Thanks!

 

[mmbongo]

First things first....this is not a good idea. It won’t sound good. But you can do it.

You have a powered sub so you have to have an amp with preamp outputs. You cannot hook that sub up to a speaker jack.

If your amp has a 1/4 preamp out, you will need an adapter to RCA for the sub. You can also use a small mixer.

But again, it will sound like mud.

My advice...that is a nice sub. Hook it to your home stereo as it was designed to do or sell it to buy a bass guitar amp.

 

[abarson]

The Martin Logan Grotto is intended to be used with a home stereo, not musical instruments. It has both high pass and low pass filters so it won't cover much of the actual bass guitar frequencies.
The Rumble 25 is 25 watts at 8 ohms and its internal speaker is rated at 8 ohms: you cannot add a speaker to this combo.
In short, no.

 

[Downunderwonder]

With a real PA powered sub it would be possible to compose a gig rig with the combo and a crossover, providing there is an fx loop on the combo.

Otherwise it's just a bad bad idea.

 

[BassmanPaul]

Inherited a Martin Logan Grotto active sub from my brother,

Does this statement mean that you have lost your brother? If yes I'm sorry for your loss.

 

[David Pipkin]

Unfortunately, yes. It was a while ago but still sucks.
Thanks for all the quick responses.