Bose F1 Model 812 with F1 Subwoofer

Discuss the Bose F1 Model 812 and F1 Subwoofer here.

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Bose F1 sub sounding stressed, but not limiting or clipping

My band has the Bose F1 top/sub system and on occasion we seem to be stressing the subs. The grills are rattling and to the ear the woofers sound stressed, but there also is not a whole lot of impact on the dance floor.

At the same time, there is no indication of limiting or clipping from the speaker. My thought (and hope) would be that the built in limiter should kick in and/or we should see a clip indication before there was the potential for damage to the speaker. I guess it's possible that the limit and clip LEDs are not functioning correctly, but it'd be unlikely to have that issue with both subs, right?

The subs sound 'normal' at moderate volumes so I don't think the drivers are damaged at all. It's just at high levels that we're experiencing this issue. In some cases we are likely asking a bit too much out of the system (bigger system is needed) but I'd like to determine what's going on - or not - with the limit and clip indicators.

Any ideas?

Original Post

This may or may not have anything to do with your situation, but are you running your speaker cable from the "sub out" feature of an EQ?  If so, what frequency are you crossing it over at?  If it's set too low, it's possible that could potentially create a problem.  I haven't had that problem with my F1 subs, but previous subs I've owned have had a similar issue.  Just a thought...

Watching to see what others respond.

Tony posted:

This may or may not have anything to do with your situation, but are you running your speaker cable from the "sub out" feature of an EQ?  If so, what frequency are you crossing it over at?  If it's set too low, it's possible that could potentially create a problem.  I haven't had that problem with my F1 subs, but previous subs I've owned have had a similar issue.  Just a thought...

Watching to see what others respond.

No, not running from an EQ out or any other external processing. No external crossover is in use, we are running direct from mixer to speakers and allowing the built-in filters to do the crossover work.

Here are some details on the system and set-up:

Subs are run off an auxiliary send (Bus 6), and mains are direct from L/R of mixer (Behringer XR18). 

Channels sent to Sub Aux - Kick, Bass guitar, tracks, toms, playback audio for set breaks.

Kick and bass have channel HPFs of 45hz and 35hz, respectively.

No channels are clipping and the mixer is kept in the green.

 

 

I know exactly what you are talking about.  If you overdrive the F1, it is clearly audible, and yes it almost sounds like a rattle. I run into this issue, exactly to what you are describing.  The limit lights don't light up when this is happening...

To me it sounds like the drivers could benefit from a bigger box as it seems it's a cabinet issue.  At first, I thought the cabinet lacked proper bracing, but I have gotten used to it, and just back off it a little when I hear it.

jdbassentertainment.com posted:

I believe what you are experiencing is called port noise... The F1 sub was designed to be used with the F1 812. If the two are employed together the port noise even at high volumes in not audible.

We are using the complete F1 system. 

I'm familiar with the sound of port noise. What I'm hearing doesn't sound like that, but it's possible that is an issue.

But it is totally audible with the whole system at high volume.

jaswrx posted:

I know exactly what you are talking about.  If you overdrive the F1, it is clearly audible, and yes it almost sounds like a rattle. I run into this issue, exactly to what you are describing.  The limit lights don't light up when this is happening...

To me it sounds like the drivers could benefit from a bigger box as it seems it's a cabinet issue.  At first, I thought the cabinet lacked proper bracing, but I have gotten used to it, and just back off it a little when I hear it.

That you for confirming I'm not a crazy person.

Our solution has been to back off as well. Not a deal breaker, but it really means that this system is not big enough to provide the output for some of our events.

PatJonCook posted:
jaswrx posted:

I know exactly what you are talking about.  If you overdrive the F1, it is clearly audible, and yes it almost sounds like a rattle. I run into this issue, exactly to what you are describing.  The limit lights don't light up when this is happening...

To me it sounds like the drivers could benefit from a bigger box as it seems it's a cabinet issue.  At first, I thought the cabinet lacked proper bracing, but I have gotten used to it, and just back off it a little when I hear it.

That you for confirming I'm not a crazy person.

Our solution has been to back off as well. Not a deal breaker, but it really means that this system is not big enough to provide the output for some of our events.

ya, just back off of it tad.  A pair of F1 subs hold its own against a nice 18" sub.  But one for one, a good 18" usually outruns it.  Use the F1 subs in pairs, and they sound awesome and have a lot more headroom.

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