This Bass Test Is Not Designed For People With Ported Enclosures!

[Rubycon]

Hahahahahaha!

A bit of warning if you play this loud, have a signal chain that goes down low and large (30dBm+) amps...

An unloaded driver WILL hit xmech pretty quickly.

I did experience this on a system unlike the Thigpen which makes noise on its own. You literally feel everything that's loose nearby swaying. And if you have any, ahem, extremities that can move, they will too! To the point where it feels like they are falling off!

This is much easier to feel the system working:

https://www.youtube.com/watch?v=nk-0FiJuh14

And finally full of 20Hz sine waves.

https://www.youtube.com/watch?v=2V48Rd-kgnU



If you want to get an idea what 20Hz at 175dB feels like, cut the RJ11 off a telephone cord, stick the active pair in your mouth while a buddy calls you! "D

 

[OutHouse]

why?

 

[IronWing]

The speaker in the video is ported.

 

[Carson Dyle]

If you want to get an idea what 20Hz at 175dB feels like, cut the RJ11 off a telephone cord, stick the active pair in your mouth while a buddy calls you! "D

I'd be totally amazed if even 1% of the members of this forum have a POTS line (or a buddy).

And few of them have anything better in their homes than a pair of plastic computer speakers sitting on their desks.

 

[IronWing]

I'd be totally amazed if even 1% of the members of this forum have a POTS line (or a buddy).

And few of them have anything better in their homes than a pair of plastic computer speakers sitting on their desks.

I do, I do! But I ain't sticking it* in my mouth no matter how nice Rubycon acts.

* Neither the POTS line nor the buddy is going in my mouth.

 

[Kaido]

Dang, wish I still had my Sonosub!

 

[deustroop]

If you want to get an idea what 20Hz at 175dB feels like, cut the RJ11 off a telephone cord, stick the active pair in your mouth while a buddy calls you! "D

Yes this is very slow time of the year.

 

[13Gigatons]

Most ported subs are rolled off sharply below their port frequency. Also sealed subs will bottom out much faster then ported subs, which is the advantage of a ported sub.

 

[Rubycon]

Most ported subs are rolled off sharply below their port frequency. Also sealed subs will bottom out much faster then ported subs, which is the advantage of a ported sub.

It's not that simple. A ported sub will have substantially lower excursion at the tuning frequency however unloads quickly below this frequency. A sealed box can tolerate lower frequencies and will play lower at the expense of efficiency. A good design should never reach x-mech when driven within its designed frequency and power range. This includes equalization to enhance low frequency response.

 

[Red Squirrel]

I like the fact that on the cheap computer speakers here at work I hear literally no base. I was expecting the cheap plastic to at least rattle or something, maybe that's a good thing, means they actually bothered to add some filtering.

I'll have to try it at home. I don't have a fancy system but do have a sub.

 

[VirtualLarry]

I remember when I used to have a sub. Creative Labs / Cambridge Soundworks, "PC Works 2.1" system. Wasn't too bad, had good clarity of sound I thought. Wonder what happened to that set...

 

[Red Squirrel]

My set is actually over 10-15 years old. Was looking at old random pics of stuff like my PC setup or other random pics in my room back when I was still in high school and I still have that same set lol. There's one pic where I had a newer set then went back to the old ones since the new set was picking up FM radio and was overall less quality. I have to hand it to Altec Lansing for making such a high quality PC speaker set that still serves me well to this day. it's no Bosse or whatever is the super high end brand these days, but it gets the job done well.

 

[Murloc]

it's no Bosse or whatever is the super high end brand these days, but it gets the job done well.

Bose is the well-marketed brand but audiophiles bash it all the time, because it apparently sucks and is not modular at all, it's like a set of 5.1 PC speakers, you have to throw it all away and start over if you want to change even a single thing or a single thing breaks (in addition to relying on a PC sound card instead of outputting the audio over hdmi to a proper AVR), unlike if you have a proper AVR and passive speakers and a subwoofer, in which case you can upgrade the technology and keep the speakers, use whatever sub you want, or upgrade the speakers (within the limits of the AVR).

 

[WhoBeDaPlaya]

Tried it on a Velodyne DPS-12. Fun

 

[BurnItDwn]

Hmm, I think my PL200 probably doesn't have the oomph for this .... I think at 20 hz it puts out barely over 80 db ...

 

[blackangst1]

I may try this for shits and giggles...my Rhythmik FV15HP was tested by audioholics @ 116db @ 20hz

 

[thestrangebrew1]

I want to try this with my RBH I-12 now. Gotta wait till I get off work...

 

[Rubycon]

I may try this for shits and giggles...my Rhythmik FV15HP was tested by audioholics @ 116db @ 20hz

Plug one of the ports for best results. The lower fundamentals are indeed loud in capable systems. Also bring any doors to near closed position and watch them pump in and out with the waves!

 

[blackangst1]

Plug one of the ports for best results. The lower fundamentals are indeed loud in capable systems. Also bring any doors to near closed position and watch them pump in and out with the waves!

Yeah I run with one port closed normally for deeper extension. Thats one thing I love about this sub is its tuning ability

 

[monkeydelmagico]

just got a new 15in dayton sub for home theater system. This sounds like a great way to break it, thanks Ruby!

 

[Number1]

Holy F!!! LOL The whole house was shaking. Bash 500 amp coupled to a 12" driver in a sealed enclosure with a 15" passive radiator. It's fun to atch the windows vibrate.

I had to keep the volume low as the driver was bottoming out.

 

[sdifox]

Bose is the well-marketed brand but audiophiles bash it all the time, because it apparently sucks and is not modular at all, it's like a set of 5.1 PC speakers, you have to throw it all away and start over if you want to change even a single thing or a single thing breaks (in addition to relying on a PC sound card instead of outputting the audio over hdmi to a proper AVR), unlike if you have a proper AVR and passive speakers and a subwoofer, in which case you can upgrade the technology and keep the speakers, use whatever sub you want, or upgrade the speakers (within the limits of the AVR).

That is not the reason Bose gets bashed. It's because they selling crap as high end system. But since they spend shit ton on ads, they get away with it.

 

[13Gigatons]

It's not that simple. A ported sub will have substantially lower excursion at the tuning frequency however unloads quickly below this frequency. A sealed box can tolerate lower frequencies and will play lower at the expense of efficiency. A good design should never reach x-mech when driven within its designed frequency and power range. This includes equalization to enhance low frequency response.

I've designed plenty of ported systems from 15hz home theater models to 35hz PA models. Carefully pick your desired driver and then tune the port and make sure it is rolled off below the port frequency. I'll admit that there are not that many great drivers for small or large vented designs, need to wade through all the mediocre ones.
However a well designed ported system will perform great.

 

[sdifox]

I have blasted Telarc 1812 (version 2) dvd audio at reference level before. Had to cover my ears but I felt it.

 

[Sho'Nuff]

I'm tempted to try this out with my SVS PB13 Ultra - will have to wait until the kids and wife are out of the house though. I don't suppose earplugs will do anything to protect my hearing in this instance eh?