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Forum: DIY Speakers and Subs   05-26-2017, 04:14 PM
Replies: 7
Views: 122
Posted By LTD02
hello dr. j., agree with rhodesj...

hello dr. j.,
agree with rhodesj (http://www.avsforum.com/forum/members/7496117-rhodesj.html)
4" port height is all that is necessary.
might want to move the driver up the cab a little for a...
Forum: DIY Speakers and Subs   05-26-2017, 03:59 PM
Replies: 44
Views: 977
Posted By LTD02
fyi, it is active and the crossover specs have...

fyi, it is active and the crossover specs have been posted.
Forum: DIY Speakers and Subs   05-25-2017, 08:38 PM
Replies: 152
Views: 5,836
Posted By LTD02
that should be fine, so long as using cabs that...

that should be fine, so long as using cabs that are the same general design. both in sealed or both in ported with similar tuning frequencies, for example.


driver is best suited for sealed and...
Forum: DIY Speakers and Subs   05-25-2017, 12:11 PM
Replies: 44
Views: 977
Posted By LTD02
http://www.audioheritage.org/vbulletin/showthread....

http://www.audioheritage.org/vbulletin/showthread.php?37659-Project-M2-DIY-Thread&p=405897&viewfull=1#post405897
Forum: DIY Speakers and Subs   05-25-2017, 11:58 AM
Replies: 2
Views: 85
Posted By LTD02
bump.

bump.
Forum: Audio Gear   05-25-2017, 11:55 AM
Replies: 26
Views: 1,225
Posted By LTD02
the driver parameters actually favor largish...

the driver parameters actually favor largish sealed or infinite baffle applications, so they should work very well. as with all IB, be sure to keep an eye on excursion with ulf-content, so the...
Forum: DIY Speakers and Subs   05-20-2017, 10:38 PM
Replies: 4,098
Views: 233,148
Posted By LTD02
@amit916...

@amit916 (http://www.avsforum.com/forum/members/8955938-amit916.html)
yes, that cable will work.
Forum: DIY Speakers and Subs   05-20-2017, 10:35 PM
Replies: 152
Views: 5,836
Posted By LTD02
just an fyi, winisd is accurate with respect to...

just an fyi, winisd is accurate with respect to excursion vs. output. at higher levels, excursion is slightly less than model because of reductions in bl strength and suspension compliance as the...
Forum: DIY Speakers and Subs   05-20-2017, 10:30 PM
Replies: 152
Views: 5,836
Posted By LTD02
with sealed there is a single resonance...

with sealed there is a single resonance (impedance peak). under that, the power continues to rise. this is a pair of sealed 18ht's in 4 cubic feet enclosures at 600 "watts" per driver.

...
Forum: DIY Speakers and Subs   05-20-2017, 10:33 AM
Replies: 6
Views: 170
Posted By LTD02
seems like an interesting idea. for parallel Rt...

seems like an interesting idea. for parallel Rt is 1/Rt = 1/R1 + 1/R2 or in this case 1/Rt = 1/8 + 1/16 = 1/0.1875 = 5.33 ohms.


on the other hand, there is nothing wrong with running 3 drivers...
Forum: DIY Speakers and Subs   05-20-2017, 10:10 AM
Replies: 152
Views: 5,836
Posted By LTD02
keep in mind that a ported cab will have its low...

keep in mind that a ported cab will have its low impedance minimum right on the port tune, so that is actually the only point where ohm's law can be applied to figure out power based on amplifier...
Forum: DIY Speakers and Subs   05-16-2017, 11:12 AM
Replies: 161
Views: 15,835
Posted By LTD02
hey noah, the method that i use for this is by...

hey noah, the method that i use for this is by using the linkwitz transform with q=0.707 for both sides (a q=0.707 shelf is equivalent to the 12db/oct shelf filter).


because the filter is...
Forum: DIY Speakers and Subs   05-11-2017, 08:56 PM
Replies: 6
Views: 164
Posted By LTD02
nothing inherently wrong with mixing drivers. ...

nothing inherently wrong with mixing drivers.


like derrick mentioned, if the cabs are tuned the same and the responses are eq'd and level'd so that the "whole system" runs out of headroom at...
Forum: DIY Speakers and Subs   05-11-2017, 04:03 PM
Replies: 11
Views: 226
Posted By LTD02
minor clarification. stereo mode doesn't combine...

minor clarification. stereo mode doesn't combine the audio signals. it simply applies the same eq to each of the channels.

soulcougher73
start with it at zero. most avr's will apply a 4th...
Forum: DIY Speakers and Subs   05-10-2017, 05:00 PM
Replies: 11
Views: 226
Posted By LTD02
most of the time, if you have a symmetrical...

most of the time, if you have a symmetrical layout, each sub output on the avr would be for where subs will have different time alignments or different equalizations (such as if one sub or set of...
Forum: DIY Speakers and Subs   05-10-2017, 12:40 PM
Replies: 11
Views: 226
Posted By LTD02
bi-amp1 takes the input from channel A and routes...

bi-amp1 takes the input from channel A and routes it through two independent equalizations and then outputs the resulting signal on channel A and channel B. since your subs are symmetrically placed,...
Forum: DIY Speakers and Subs   05-10-2017, 08:50 AM
Replies: 9
Views: 174
Posted By LTD02
the size of the enclosure is fine. the driver...

the size of the enclosure is fine.
the driver frame may be too large for the cutout.
confirm that your driver is just over 18.5" and shoot erich a note to see if he has a baffle with a cutout that...
Forum: DIY Speakers and Subs   05-10-2017, 08:11 AM
Replies: 11
Views: 226
Posted By LTD02
plug your rca-to-xlr cable into channel a set...

plug your rca-to-xlr cable into channel a
set inuke to bi-amp1
set limiter to 1100 watts at 4 ohms or ~93 volts peak (vp)
set high pass to 2nd order (12db/oct) butterworth at 20hz
use the avr to...
Forum: DIY Speakers and Subs   05-08-2017, 05:31 PM
Replies: 25
Views: 606
Posted By LTD02
lol. great story. ply is just fine and...

lol. great story.


ply is just fine and in some ways better than mdf, so after all this time consider yourself redeemed. :-)
Forum: DIY Speakers and Subs   05-05-2017, 08:59 PM
Replies: 76
Views: 2,181
Posted By LTD02
kind of depends on the gain structure itself as...

kind of depends on the gain structure itself as to what to do next. the high shelf with negative gain is obviously going to reduce the gain structure by the amount of the shelf, in this case -6db. ...
Forum: DIY Speakers and Subs   05-05-2017, 08:50 AM
Replies: 225
Views: 8,354
Posted By LTD02
pretty cool. seems like the buyer would get more...

pretty cool. seems like the buyer would get more for his money with something like this than the Rockford Fosgate.
Forum: DIY Speakers and Subs   05-05-2017, 01:02 AM
Replies: 4,098
Views: 233,148
Posted By LTD02
a protective high pass filter simply filters out...

a protective high pass filter simply filters out the frequencies below the tuning point on the ported cab.


under the tuning point of a ported cab, the driver behaves almost like it is in free...
Forum: DIY Speakers and Subs   05-05-2017, 12:56 AM
Replies: 4,098
Views: 233,148
Posted By LTD02
not quite sure what you are asking. the...

not quite sure what you are asking.


the ported vs. sealed at 1250 watts differential will be there whether you are comparing 1, 2, or 4 ported subs against 1, 2, or 4 sealed.


reducing power...
Forum: DIY Speakers and Subs   05-03-2017, 09:52 PM
Replies: 229
Views: 9,020
Posted By LTD02
I'm not sure what I was thinking, for series...

I'm not sure what I was thinking, for series wired subs, the Y would need to be down toward the subwoofer location itself. In this case, just double up the wire so each long leg heading down toward...
Forum: DIY Speakers and Subs   04-29-2017, 11:44 PM
Replies: 4,098
Views: 233,148
Posted By LTD02
here is a quick comparo of 4 cubic foot sealed,...

here is a quick comparo of 4 cubic foot sealed, vs a mini-marty style cab with protective high pass and compensating eq. 1000 watts each (just for comparison sake). no room gain or other effects...
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