Bass/speaker excursion issues

Have you used an equalizer program or room correction?

Long Excursion/strong surround is one method of rapidly moving enough air for low frequencies, .i.e. the iron law: low frequencies: move more air. clever vents, ports, passive diffusers: all combine to move more air.

my big 15" velodyne sub had soft foam surround, more surface, less excursion, less powerful amp. My Infinity sub, 10" driver controlled by 1000 watt amp is strong rubber surround, high excursion.

my vintage 15" woofers have pleated cloth surrounds, controlled by monster magnet, woofer weighs 37 lbs each.

speed, (both in and out), needs to be controlled by powerful magnet combined with the material the surround is made of.

Is the maker still around? You can ask Madisound/Parts Express for their knowledge.

btw, you are mentioning cone excursion. the amp/signal will move the woofer cone the same no matter the size of the space, or room's acoustic properties. Those will effect what/how the long throw driver's output reach your ears.

If your speakers are ported and small plug the ports.

You may or may not like the end result, but excursion below the port f should be reduced

@whataboutbob1 Wrote:

Has anyone experienced this and is there a solution other than turning the volume way down?

Yes. Bigger speakers with bigger woofers. What speakers do you have?

Mike

Russ69: no I haven't. 

Elliott : the manufacturers is Shu. I use two subs. They have 15" drivers and 650 watt amps (1000 watt short term max) . 

Erik: Sealed boxes, no ports. 

Dit usa: I have Aeriel 10T speakers, 11" drivers in ported bass only cabinet. The subs (I use two) are Hsu Research. They use 15" drivers in a sealed box. The internal amps are 650 Watts with short-term peak of 100 watts.

Elliot: typo:  Hsu, not Shu subs

This issue happens in very few tracks, and never on all tracks on one CD.  It's pretty alarming to see how far the drivers go in and out.

@whataboutbob1,

What frequency do you crossover from the mains to the sub? 70Hz?

Mike

Ditusa: 60 hz

Raise your x over f to 80Hz and or increase crossover slope if you can

What Hsu Research model do you have?

@erik_squires Wrote:

Raise your x over f to 80Hz and or increase crossover slope if you can

I agree, your main woofers are to small for 60Hz.  Extreme excursion = high distortion. 😎 

Mike

HSU is still around, ask them, send them a short video.

https://www.hsuresearch.com/subwoofers.html

I always wanted to hear a/some HSU, seems they know what it's all about.

Highend64: ULS-15

Erik squires and ditusa: I have been running the main speakers full range and trying to slide the subwoofer bass frequencies under what the main speakers are capable of. Using a meter and test disc it seems as the mains start falling off at 60hx (but still have a meaningful amount of lower frequencies below 60 hz). I did this as I absolutely love the sound of the main speakers and want to have there precense involved as much as possible. But I can note that when the speakers do the low frequency large Excursion it does it on the main speakers as well as on the subwoofer.

I'm wondering if I just need to find some kind of device that will filter out super low frequencies? I do have a DSPeaker Dual Core which is a DSP device used to integrate Subs in the main systems. It worked well with my previous amplifiers(Cary V 12's) but with my current amplifiers (Parasound JC 1+ mono blocks) it seems to detract from the sound overall.

But..... even with the DSP in place with the previous amplifiers, the carry amps, it still did the large Excursion thing. And again it's only on a few tracks that have really low base.

Maybe I should just be grateful for the great sound I get on 99% of the music that I listen too and press skip I know that have this anomaly.

OP

You are living in a darkness born of myth, and I wish I could point you to all the threads on A'gon that go something like "omg, I raised the crossover point on my speakers and they sound so much better!"

The higher crossover point minimizes distortion by leaps and bounds and it is completely a positive thing.

Erik squires: in order for me to try that I think I would need to do one of two things? One would be to have a DSP device to help divide the frequencies going to the speaker and to the sub? The other would be to run speaker wires directly to the subwoofer and then run another set of speaker wires from the subwoofer to the main speaker? Or are there easier ways to do this?