My Rythmik FV18 is Broken. Next steps?

[TLS Guy]

Yeah it will be interesting. I assumed it is the servo board from the instructions, because it is tied directly to the speaker wires. No way to take it off without cutting the wires. As well as the paper work and instructions eluded to it being the servo board. But I could be wrong.

Staggering what some designers do. Who designs in a way a board can't be removed without cutting wires? That is just bad practice. Years ago I had an retired Africana math teacher. When we were doing our work he would come up behind you, and if we had made a "howler" he would put one finger on the howler as he tweaked the hairs in the back of your neck, and pronounce " Say your wretched". he he keep going until you said, "I'm wretched sir, I'm wretched sir!" We all thought it a hoot and frequently imitating him. Anyhow those designers need to be made to "say they are wretched!"

 

[AcuDefTechGuy]

Staggering what some designers do. Who designs in a way a board can't be removed without cutting wires? That is just bad practice.

Yeah well just buy externally powered subs and never have to worry or complain about it.

 

[lovinthehd]

Is Brian Ding a member here?

 

[TLS Guy]

Yeah well just buy externally powered subs and never have to worry or complain about it.

That will work for ported subs, but not sealed ones or servo subs like the OPs. Sealed subs need Eq below F3, and then a high pass filter to stop driver over excursion. Basically that is what I do, although my long main lines are a sub plus and each requires two power amps as the two drivers do not receive the same signal.
I do understand the convenience of a sub plus amp. It reduces clutter, and also allows for phasing and volume trim and issues like that.

 

[AcuDefTechGuy]

That will work for ported subs, but not sealed ones or servo subs

It works perfectly with both ported and sealed. For example, the RBH 1212N-MS/R, Unrivaled-12NS, Unrivaled-21, and Unrivaled-221 subs are sealed passive subs.

Just no passive for “servo”, which is a gimmick to me. I used to own dual servo subs.

I’ve been using both sealed and ported passive subs for years. Never had one issue with drivers or external amps.

 

[everettT]

They make passive subs for both ported and sealed. For example, the RBH SI-1212 and Unrivaled-21 subs are sealed passive subs.

Just not passive for “servo”, which is a gimmick to me. I used to own dual servo subs.

Servo isn't a gimmick and not it's only used for subwoofer applications, FWIW. I believe what @TLS Guy was saying is , and could be mistaken, that amplification for sealed subs has to have the ability, whether DSP or fixed options, to taylor sound correctly, including extension, meaning you can't just plug in any amp and achieve the desired results. That can happen with ported subs...

 

[TLS Guy]

It works perfectly with both ported and sealed. For example, the RBH 1212N-MS/R, Unrivaled-12NS, Unrivaled-21, and Unrivaled-221 subs are sealed passive subs.

Just no passive for “servo”, which is a gimmick to me. I used to own dual servo subs.

I’ve been using both sealed and ported passive subs for years. Never had one issue with drivers or external amps.

Unless a sealed sub is sold with an active equalizer it will not work well at all.

The F3 of a sealed sub is in the neighborhood of twice the Fs of the driver. So, say we have an really good driver with an fs of 20 Hz, and that is pretty low, then the native F3 of the sub will be around 40 Hz. So sealed subs require an Eq of 12 db per octave below Fs of the driver. The usually there is a high pass limiter at the xmax of the driver to prevent damage.

So selling a passive sub is just nonsense without the correct Eq and likely a high pass.