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I've done both the 85L vented and the 54L sealed. Neither needed an amp that big. The 250W PE hardly gets the gain nob turned before I run into trouble. As far as the designs, I use the ported because its use is 90% HT. I really do like the 54L and it did a good job. The ported is a touch...

I would but I would be too embarrassed. Since it was a prototype, I used scrap MDF and one of the pieces has four “experimental” holes I used for leg forming experiments from a previous project. They are not thru holes, but none the less embarrassing to show other DIY’ers. The outside could be...

I am making an 85L Vented enclosure to go with my DPL12. This will probably replace the 54L because I can just plug the port if I do not like the vented application and I’ll have a nice 85L sealed box. So what do I do with the 54L? I have no use for a sub anywhere else. Maybe put a Shiva in...

If I do the calculations correctly, that box seems way to big. I did some calculations and got a 15L box with a 1in port 6.5in long. This is what is recommended here. I could be wrong, I'm not a super user of WinISD, but this box seems big with that size port. I'm sure someone here will...

Well, after better search criteria I have answered most of my questions. Sometimes the right words make all the difference. The only questions that are left for the DPL12 are the following: With the DPL12 Tuned to 20Hz there is a 1-2dB hump in the frequency curve. Will I hear this? Would...

As you can see from my previous post on the sealed 54L DPL12, I got a pretty good in room response. However, I am going to make an 85L vented design and see which I like best. All of this at calibrated levels, of course. My question is - would this work very well with these parameters: 85L...

What about an acrylic fish tank? These are readily available and with the right tools it is easy to cut holes in them. Or you could get a bending bar made for acrylic. These are for people who want to make their own tank for custom Aquarium installs.The advantage to the bending bar is one...

I think getting lost in all of this was my first line in the initial post:

Here are links to pictures of the leads. Sorry I can't imbed them, the forum won't let me yet. Just ad http: Non Rattling Side //claymore.engineer.gvsu.edu/~dewittp/Non_Rattling_Side1.jpg Rattling Side //claymore.engineer.gvsu.edu/~dewittp/Rattling_lead1.jpg...

I tested it in free air in both vertical and horizontal positions. The “abnormal” displacement happens in both the box and in free air. Obviously, the free air was more pronounced, but it was still very apparent in the box. At 20-25Hz, the displacement seemed relatively normal. However, when...

Well, curiosity got the best of me. The resistors are 56K and 120K, these are the values for a non boost model.

Brian- I was very encouraged by Geoff's post also. This could be the root of the problem. The model number was PE 250W 300-794. I read the instructions about the base boost adjustment. However, I would hate to take apart a new amp and do something that would void the warranty or make it...

To put to rest on whether or not it is bottoming out- The sound is like two large magnets slamming into each other. I am 100% positive that it is bottoming out. I can not emphasize enough that I can tell it is bottoming out. Brian- I understand that when calibrated the amp level should...

I was able to play a 20Hz test tone at 100% volume on the amp knob. There was some rattling, but it sounded like a rattle in the box (I'll discuss this latter). Then 25Hz was also no problem. The readings for these two were 112 and 115 respectively. However, when I played the 30Hz signal, the...

BTW with a sag % of 6.5, am I in trouble if I leave this down firing. I plan on making a second box (ported 85L) and comparing, so now would be the time to change the design on that box if the sag % is to high.

As I said, I wouldn't believe it unless I was there. Maybe this will help solve the mystery. Here is the procedure I used: Set receiver to calibrated volume for other speakers (-30) and sub amp to 50% played 20Hz and recorded the readings. Then I moved up to 25, 30, ect. When I reached...

It is hard to represent the sound correctly with just words. Think of it as slapping. It isn't like a rattle at all. I took it apart and could not find anything that stands out. Here is my first thought after some time to think about it: The polyfill I used was the type for stuffing...

There is definitely a thumping sound coming from the box. I can only assume by the violent nature of the sound it was bottoming out. I couldn't imagine it is air escaping. This sound was too loud. To add to the problem description. It was not there for about 0.5-1 seconds and then it would...

Last night I tested my DIY Down Firing 54L DPL12 w/ 16oz of polyfill. The results were encouraging and frustrating. Parameters: Sine waves from 20-70 @ 5 Hz intervals until 40 Hz In corner of room with SPL meter @ 1 meter away Phase set to 0 Crossover set to ~90 Hz Sub Volume @ 40-50%...