[Danny Richie]

Bottom port would be nice.  I have carpeted floor myself.  Would it make any difference with bottom port and hardwood floor?

If they are wall mounted with the driver at ear level then the down firing port will be quite a ways away (as we say in Texas) from the floor.

[dlparker]

No.... 
It's referring to the amp itself.
It's better to use a 500 watt amp on a 10 watt speaker, than a 10 watt amp on a 500 watt speaker.
Just be mindful to not turn the volume knob to the point where you hear distortion.

Thanks!

But I CAN with some authority tell you that it's a lot of fun to plug a transistor radio speaker into the main out on a Fender Dual Showman Reverb, turn everything up to 10 (yes, I know, I know, YOURS goes to 11), hit a full chord and observe the results. It's best not to be standing too near the speaker when you do this.

[S Clark]

The flatpacks are back in stock on my site. 6 pairs available to ship tomorrow.

I wanted to give a thumbs up for Baniels.  The sides of the flatpack I ordered came mangled by FedEx.  Ben sent me new parts that arrived today, packed so that gorillas couldn't damage them.  Great customer service.

[Bob in St. Louis]

Thanks!

But I CAN with some authority tell you that it's a lot of fun to plug a transistor radio speaker into the main out on a Fender Dual Showman Reverb, turn everything up to 10 (yes, I know, I know, YOURS goes to 11), hit a full chord and observe the results. It's best not to be standing too near the speaker when you do this.

Sounds like the result of the scene in "Back To the Future" when he plays guitar with that four foot tall speaker. 

[dlparker]

Sounds like the result of the scene in "Back To the Future" when he plays guitar with that four foot tall speaker. 

I don't know where the actual speaker cab for the showman was sitting - wasn't there - got the story second hand. 4-5 feet is about right for those 2x15 cabs. They pointed the transistor radio speaker (MAYBE 2-2-1/2") to the wall, fired the thing up, hit the chord and their was a simultaneous flash/sound/smell.. End result - voice coil embedded in the drywall a foot or so away.

If my buddy Bob Pruitt in San Diego (EE prof and most recent band 'The Blues Demons') or brothers Dave or Dick (of the very popular Columbia, MO based band The Bel Airs) are reading this they can fill in the details. My memory of things heard, witnessed or imagined from those days is foggy at best.

[Bob in St. Louis]

There's some pretty entertaining YouTube videos of guys plugging large woofers into a 110volt outlet. 

[dlparker]

There's some pretty entertaining YouTube videos of guys plugging large woofers into a 110volt outlet. 

No fatalities, I hope. I'm sure it would be possible!

[Guy 13]

A quick reminder to you guys that are getting in flat packs.

Be sure and line the cabinets with No Rez before you assemble them.





You won't be able to get it in there after assembly.

I was going to offer the 1/2 sheet of No Rez with the kit and ship them together. But if you guys want to get started getting them together then give me a call and I'll send you guys the half of a sheet of No Rez. I will then deduct that from the cost of the kit when you order the kit.

Hi Danny and all Audio Circle members.
When you calculate the internal dimensions of your enclosures,
do you take into account the reduction of the internal dimensions/volume
caused by the NoRez.
It look like it's reducing quite a bit the internal dimensions.
Look like it's reducing the internal volume by something like 50%.

Guy 13

[Guy 13]

There's some pretty entertaining YouTube videos of guys plugging large woofers into a 110volt outlet. 

Hi Bob and all Audio Circle members.
It's funny to see how unexpected direction a topic can take with time.
From Danny's small full range driver to subwoofer blow-up.
I am not complaining, as a matter of fact, I like.
Well, most of the time anyway.

Guy 13

[Danny Richie]

Hi Bob and all Audio Circle members.
It's funny to see how unexpected direction a topic can take with time.
From Danny's small full range driver to subwoofer blow-up.
I am not complaining, as a matter of fact, I like.
Well, most of the time anyway.

Guy 13

It doesn't actually reduce air space. It adds air space.

Slowing down the air flow within the cabinet makes the woofer act as if it is in a larger air space.

[Bob in St. Louis]

Hi Bob and all Audio Circle members.
It's funny to see how unexpected direction a topic can take with time.
From Danny's small full range driver to subwoofer blow-up.
I am not complaining, as a matter of fact, I like.
Well, most of the time anyway.

Guy 13

Ok...well....
since you asked....
- http://www.youtube.com/watch?v=PyI8cSPzfXQ
- http://www.youtube.com/watch?v=S9S3orylkO4

There's a couple driver destroying idiots. 

[Guy 13]

It doesn't actually reduce air space. It adds air space.

Slowing down the air flow within the cabinet makes the woofer act as if it is in a larger air space.

Hi Danny and all Audio Circle members.
The NoRez absorb airflow, therefore reduce the speed, is that correct?
When you reduce the area of a tube, it increase the speed of air.
Is that correct?

Guy 13
After this I will stop taking your precious time
and you will be able to spend more time on designing
nice sounding speakers, like my V1.
If I had the money, I would be interested in importing-selling
your future (Danny's Audio) speakers here in Vietnam, since I am stuck in this country for a few more years.

[Guy 13]

Ok...well....
since you asked....
- http://www.youtube.com/watch?v=PyI8cSPzfXQ
- http://www.youtube.com/watch?v=S9S3orylkO4

There's a couple driver destroying idiots. 

Hi Bob and all Audio Circle members.
On the first video,
I am surprised that the woofer lasted that long before blowing up in smoke.
On the second video, the woofer took only a few seconds to smoke,
but it's because it looked much cheaper in construction.
It's too bad they blow up nice drivers like that,
I would take them home and make better use of them.
By the way, are Abbie's speakers found their way in her room
or are they still sitting on the work bench?
It's been quite since she's completed her master pieces.

Guy 13

[Bob in St. Louis]

Thanks for asking Guy.
Yes....Abbies newly built speakers are still sitting on the workbench.   
I have yet to remove her old furniture, prime the walls, paint the walls, assemble the new furniture, install her 2 channel system......

I'll bump the thread when we've made more progress.

Sorry all for the OT.

Bob

[dlparker]

It doesn't actually reduce air space. It adds air space.

Slowing down the air flow within the cabinet makes the woofer act as if it is in a larger air space.

An "AHA!" moment. So even though adding mass (as in the NoRez obviously has some mass), the cells in the foam slow down the sound waves on their way to the harder sides of the cab, thus reducing the cancellation effect of the sound wave rebounding and hitting the cone by delaying the time it takes for the rebound wave to get back.

Am I close?

[django11]

Can someone point me to the details of these speakers?  Price, size and when.  Too lazy to go through the whole thread...  Thanks!

[Danny Richie]

An "AHA!" moment. So even though adding mass (as in the NoRez obviously has some mass), the cells in the foam slow down the sound waves on their way to the harder sides of the cab, thus reducing the cancellation effect of the sound wave rebounding and hitting the cone by delaying the time it takes for the rebound wave to get back.

Am I close?

The damping material (or foam in this case) doesn't slow down the sound waves. It slows down the airflow in the box. Pressures in the box change and are pulsed back and forth with the movement of the woofer. Like blowing through it.

The sound waves that are longer than or bigger than what will propagate in the box don't really occur. The shorter or smaller high frequency wavelengths are all the can propagate in the small air space and they are easily absorbed by the foam and insulation.

[Danny Richie]

Can someone point me to the details of these speakers?  Price, size and when.  Too lazy to go through the whole thread...  Thanks!

Price breakdown here: http://www.audiocircle.com/index.php?topic=120804.msg1296025#msg1296025

End of Feb. when the production run of drivers arrive.

[dlparker]

The damping material (or foam in this case) doesn't slow down the sound waves. It slows down the airflow in the box. Pressures in the box change and are pulsed back and forth with the movement of the woofer. Like blowing through it.

The sound waves that are longer than or bigger than what will propagate in the box don't really occur. The shorter or smaller high frequency wavelengths are all the can propagate in the small air space and they are easily absorbed by the foam and insulation.

Thanks Danny! I guess I should stop trying to think..

[IronForge]

If they are wall mounted with the driver at ear level then the down firing port will be quite a ways away (as we say in Texas) from the floor.

Ok just let us know if you draw up some plans for alternate port placements.  It will probably be DIY woodworking at that moment unless there is a flat pack.