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6 DIY eD A7S-650 kits with FP14K clone - Page 3

post #61 of 249
Thread Starter 
Oh yeah, my new favorite speaker for HT is the dual stacked DR-200's! Next up I will try a triple 8LP and dual stacked DR-250's.
post #62 of 249
I have dual stacked like you and it is worth, you gain sensitivity and sound beam smile.gif 2012_0615SubTH_18190041.JPG 2654k .JPG file
post #63 of 249
Thread Starter 
My wife came down from the bedroom the other night and said I needed to turn down the bass as her chest was vibrating in the bedroom. The bedroom is the farthest point away from my theater, the movie was Underworld 4 and the level was reference. It made me smile. Oh yeah, first time that has happened.
post #64 of 249
How close to xmech are you getting with that setup at -4?
Do you think you would gain yet another +3db with another amp? eek.gif
When your wife comes down with boxcutters or a frying pan, then you know it's too loud... hehe smile.gif
post #65 of 249
Thread Starter 
I finally went upstairs to feel what it was like and I really think I am going to break something. The floor is just moving so much and huge glass windows are just vibrating so much!

I don't know how accurate the meters are but I have plenty of amp. I can blow up the subs first! I made it hit -4 on the meter running the subs about 8 dBs hot which is much too much bass with the low end flat. 2-3 dBs is now my new max and flat sounds great. I also have a 2100 cubic foot room with plenty of displacement.
post #66 of 249
Quote:
Originally Posted by MKtheater View Post

I finally went upstairs to feel what it was like and I really think I am going to break something. The floor is just moving so much and huge glass windows are just vibrating so much!

By my rough calculations you have...
1593 sq inches of cone area, and with 3186 cubic inches per sweep of displacement, in a 2100cu ft room.

My system has:
2318 sq inches of cone area, and with 3363 cubic inches per sweep of displacement, in a 4000cu ft room.

NotNyt has:
2036 sq inches of cone area, and with 6107 cubic inches per sweep of displacement, in a ?6000+ cu ft room.

(Did I do the maths right?)

So you should both have a lot more SPL than I, especially down low.
(Assuming both of our systems are near their max excursions; and ignoring everything but subs.)

and I know I've broken a bottle of wine, 2 cups of mixed drinks, 2 lamps, 1 plate, 2 sunglasses and scratched a number of fallen cd's so far... (your mileage may vary, depending on conditions.)
post #67 of 249
Thread Starter 
LOL! I am having fun. I don't know what the max spl is on this system but reference level movies is more fun even when run flat. I never could be happy with that calibration before.
post #68 of 249
Quote:
Originally Posted by MKtheater View Post

My wife came down from the bedroom the other night and said I needed to turn down the bass as her chest was vibrating in the bedroom.

Perhaps you should try to recreate that on video to share --- for the purposes of ....err... science. tongue.gif




I kid of course!
post #69 of 249
Thread Starter 
Quote:
Originally Posted by Archaea View Post

Perhaps you should try to recreate that on video to share --- for the purposes of ....err... science. tongue.gif
I kid of course!

If you guys saw my wife I would be the most popular guy here! Especially if I recorded that! Let's just say I am lucky. I did record my old subs before but frankly they are boring because my room don't have any effects. I made sure there are no rattles and the concrete floor does not move. I guess the only effect I can show is the screen moving. I used to show the meter pinning during scenes. So I sat in the back row with my wooden riser for once and the bass was just too much, my ears were going to pop! There is no way I can run the bass hot back there. The back row is near the back wall so you can guess what it feels like. The front row is near the center of the room and why it is hard to get loud bass but my graphs say it sounds awesome!, wait, my ears too!
post #70 of 249
Quote:
Originally Posted by MKtheater View Post

If you guys saw my wife I would be the most popular guy here! Especially if I recorded that! Let's just say I am lucky.

Probably for the best as for what has been seen, cannot be unseen.

QP9kk.jpg
post #71 of 249
Quote:
Originally Posted by MKtheater View Post

I don't know what the max spl is on this system but reference level movies is more fun even when run flat. I never could be happy with that calibration before.


The new set up looks sweet and considering how you used to like running your subs hot before makes this statement even more impressive! eek.gifcool.gif

Did you ever get to compare that Triple8 to the other speakers?
post #72 of 249
Thread Starter 
Not yet, still sitting there. I will do it soon though, I hope.
post #73 of 249
Man... I surf the forum for a few hours a day. Don't know how I'm late to this party...

Man, too bad you are in Central New York. No way I could convince my wife to let me swing by to give it a listen... I'll be in Manhattan on the 27th, but it's to take my daughter to a photo shoot. Still won't be able to break away for any extended period of time.

Awesome setup though man!
post #74 of 249
Thread Starter 
Thanks, I will take new pics once I finish the main arrays. B
post #75 of 249
Quote:
Originally Posted by BassThatHz View Post

By my rough calculations you have...
1593 sq inches of cone area, and with 3186 cubic inches per sweep of displacement, in a 2100cu ft room.
My system has:
2318 sq inches of cone area, and with 3363 cubic inches per sweep of displacement, in a 4000cu ft room.
NotNyt has:
2036 sq inches of cone area, and with 6107 cubic inches per sweep of displacement, in a ?6000+ cu ft room.
(Did I do the maths right?)
So you should both have a lot more SPL than I, especially down low.
(Assuming both of our systems are near their max excursions; and ignoring everything but subs.)
and I know I've broken a bottle of wine, 2 cups of mixed drinks, 2 lamps, 1 plate, 2 sunglasses and scratched a number of fallen cd's so far... (your mileage may vary, depending on conditions.)

From a math standpoint, does the relationship between displacement and room size have a direct correlation to pressurization or (preceived) loudness? Don't get me wrong... I understand, there are many many other factors involved, I'm just wondering if proportionality has any merrit. Right off hand it doesn't seem like a 500cu ft room with 500cu in of displacement would be anywhere near as loud as a 5,000cu ft room with 5,000cu in of displacement.

My room is only 1,400cu ft and I will be hooking up two LMS Ultras by the end if the month... I haven't done the math yet, but I'm excited to hear the results. Don't hear of that many people with that small of a space employing multiple Ultras.
post #76 of 249
Thread Starter 
It all depends on the characteristics of the room as well. I lose 12 dBs at my LP or like being outside as I treated my room to have little reflections. I know my friends room is 3 times as big and loses 6 dBs at his LP which is farther away. I do get room gain of the lower frequencies though. We all do in some way.
post #77 of 249
"From a math standpoint, does the relationship between displacement and room size have a direct correlation to pressurization or (preceived) loudness?"

yes. all other things equal.

"Don't get me wrong... I understand, there are many many other factors involved, I'm just wondering if proportionality has any merrit. Right off hand it doesn't seem like a 500cu ft room with 500cu in of displacement would be anywhere near as loud as a 5,000cu ft room with 5,000cu in of displacement."

to the extent that displacement increases pressure, it will be the same overall but more random given modal behavior.

in order to build intuition for this concept, consider headphones. the "room" is your ear canal in between the ear drum and the earbud device. the speaker is tiny and hardly moves at all, yet the blast can be enormous in the bass.
post #78 of 249
Quote:
Originally Posted by BassThatHz View Post

By my rough calculations you have...
1593 sq inches of cone area, and with 3186 cubic inches per sweep of displacement, in a 2100cu ft room.
My system has:
2318 sq inches of cone area, and with 3363 cubic inches per sweep of displacement, in a 4000cu ft room.
NotNyt has:
2036 sq inches of cone area, and with 6107 cubic inches per sweep of displacement, in a ?6000+ cu ft room.
(Did I do the maths right?)
So you should both have a lot more SPL than I, especially down low.
(Assuming both of our systems are near their max excursions; and ignoring everything but subs.)
and I know I've broken a bottle of wine, 2 cups of mixed drinks, 2 lamps, 1 plate, 2 sunglasses and scratched a number of fallen cd's so far... (your mileage may vary, depending on conditions.)

Damn, how do I figure something like this out. I am sure all of you have me beat but it would be cool to know how much displacement I have.

My room is sealed and only 1,800cuft and I am running 8 Dayton HFs 15s.
post #79 of 249
"Damn, how do I figure something like this out."

125 sq inches per driver.

1.1 inches xmax point to point.

125 * 1.1 = 137.5 cubic inches swept volume per driver at xmax point to point.

137.5 per driver * 8 drivers = 1100 cubic swept inches.
post #80 of 249
notnyt has 184 sq in per driver, 2.66 theoretical excursion inches p-to-p, and 8 drivers. that yields 3915 total swept cubic inches.
post #81 of 249
Quote:
Originally Posted by LTD02 View Post

notnyt has 184 sq in per driver, 2.66 theoretical excursion inches p-to-p, and 8 drivers. that yields 3915 total swept cubic inches.

Nice, sounds like 2 Ultra's will do good in my 1,400cu ft room. Just hope it will cure the itch...
post #82 of 249
Thread Starter 
To be exact I have 2047 cubic foot room, short ceilings!
post #83 of 249
Quote:
Originally Posted by LTD02 View Post

"Damn, how do I figure something like this out."
125 sq inches per driver.
1.1 inches xmax point to point.
125 * 1.1 = 137.5 cubic inches swept volume per driver at xmax point to point.
137.5 per driver * 8 drivers = 1100 cubic swept inches.

Now I feel inadequate. lol
post #84 of 249
Adequacy is not measured in inches big guy... Keep your chin up...

lol.
post #85 of 249
is this project on the shelf now? Havent seen anything new on it lately...
post #86 of 249
Thread Starter 
Which project?
post #87 of 249
Quote:
Originally Posted by MKtheater View Post

Which project?
"6 DIY eD A7S-650 kits with FP14K clone" is the title of the thread. wink.gif
post #88 of 249
Thread Starter 
That is why I asked, I have been running them for some time now so why would he think it is on the shelf? I already took pics and measured them, just watched DM concert and it sound better than ever! I have these DR's really dialed in now and the subs sound fantastic! BTW, I am selling my 4 DR-200's to clear room for you know what. I figure I need a complete matching front stage as my center. I listened to this Concert many times and not any other speaker I have used could do what I just heard at reference! That concert is very loud at reference.
post #89 of 249
why not do 8 LMS ULTRA 18'S?
post #90 of 249
Thread Starter 
Quote:
Originally Posted by kutlow View Post

why not do 8 LMS ULTRA 18'S?

Because I won't use all that displacement, I don't use all that is available now.
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