Removing or modifying SSF filter on SS Rubicon 2500?

[s_carter 5]

I have a Soundstream Rubicon RUB1.2500D, and would like to either remove/disable the SSF circuit, or modify the SSF pot so that I can simply turn it off that way. I haven't looked at the resistance of the SSF pot yet, but could I change it out with a different value of pot to make it so that it is disabled at its lowest setting, instead of the standard 10-40 hertz? I have some experience in repairing and modifying amps, and power supplies and such, but I never have encountered something like this, yet.

[95Honda 486]

If you could get a schematic, I could maybe figure out a bypass for you.

Without one, if you had an O'scope and audio oscillator I could talk you through measuring and modifying it.

Can you post a pic of the pot?

[s_carter 5]

I really hate to modify my amp, since it is still under warranty, but I hate having it 10 hertz SSF limited more.

I haven't been able to find any service manuals or schematics for it, yet, and I have been looking.

I would like to be able to keep the SSF, but have it so that with the pot turned all the way counter clockwise, its disabled, instead of set to 10 hertz.

Here are the pics of the board. The SSF pot is the second to the left. Strange, the board says 15hz-40hz next to the pot, yet the cover, manual and specs says 10. Most likely since the boards are used in many other amps as well.

The pots are B20K, except for the SSF and LP, which are B50K's.

Thanks for the help and your time, bud!

Edited December 19, 2010 by The SSD Madman

[ssh 924]

Couldn't you just add an equalizer before the amp and boost the signal range your ssf is set to (10hz). And boost it corresponding to the ssf's slope?

Then it'd pretty much even out?, after all the filter is attenuating not a cut off.

[s_carter 5]

I could, but I dont have the cash to get an EQ that digs that low. I have been trying to find one though. They sell for well over 300 bucks new for a good one like a Bassis...

[Julian 641]

Most subwoofers I've found roll off before 15hz... aka because it's humanly impossible to hear anything much under 20Hz.. It's usually things vibrating around you.. etc.

[s_carter 5]

I realize that.

[Julian 641]

and to successfully de-solder all of that you're going to need to remove the MOSFET's and the thermal paste, then repaste then all and properly put them back?

[bassahaulic 155]

Why do you want to play below 10Hz?

[s_carter 5]

Julian, I have a 300 dollar soldering station with hot air rework, as well as plenty of thermal paste, as I said, I repair amps on a daily basis. So taking it all apart does not scare me in the least...

Bass- this is why I would like to get more output below 10 hertz.....

I love subsonics, what can I say?

Edited December 19, 2010 by The SSD Madman

[bassahaulic 155]

Doesn't look like you need anymore power.

[s_carter 5]

I'm not looking for more power, just want my SSF gone! I play around with a lot of subsonic tracks, and recordings, and I hate being limited to only half the frequencies that are there.

Edited December 19, 2010 by The SSD Madman

[jcarter1885 995]

I'm not looking for more power, just want my SSF gone! I play around with a lot of subsonic tracks, and recordings, and I hate being limited to only half the octave that is there.

As long as you have the tools and experience working on amps then find the schematics of the amp and go for it. I dont see a problem with the amp having a way to disable the subs sonic filter since some amps out there have this feature on them.

[s_carter 5]

So far I haven't had any luck on finding a SM or schematics for it, I guess this since this amp is a 2010 model, they haven't released them yet... Which is why I am asking over here, I'm pretty certain that if I had a block diagram, I could figure it out by looking it over.

[Impious 1,476]

I would try hitting up Grizz Archer over on DIYMA. He works @ Epsilon. Might be able to help you out with either a schematic or what needs to be done to bypass the circuit.

[s_carter 5]

Thanks for the heads up! I will check it out and see if he can help me out with this...

[helotaxi 46]

You might not gain anything from removing the SSF. It's a Class D amp and the modulator might by limited to 10hz. The filter may just be there to keep the amp stable.

[Julian 641]

Why not buy a big ole plate amp? and not use Car audio amps in door?

[s_carter 5]

they are hella expensive if you are looking for anything over 1000 watts. i dont have money for that, but i would buy a pro audio amp over a plate amp any day. plate amps are garbage if you ask me... I was actually thinking of getting another 2500 and strapping them together.