Search found 486 matches

by MissileCrisis
Tue Sep 27, 2016 9:57 am
Forum: Educational Links
Topic: Horn non-linearity frequency dependent
Replies: 11
Views: 2951

Re: Horn non-linearity frequency dependent

Edit: I've found a plan of attack for a redesign. I'm removing this data as a result. We can close this thread.
by MissileCrisis
Mon Sep 26, 2016 9:34 pm
Forum: Educational Links
Topic: Horn non-linearity frequency dependent
Replies: 11
Views: 2951

Re: Horn non-linearity frequency dependent

According to the sim that shouldn't be the case, not even close, excursion should be within klippel XMAX to full output. Then what's the problem? If the sim has all the answers, what does the real world matter? Work the problem. Keep investigating. Don't debate the data. I know the excursion isn't ...
by MissileCrisis
Mon Sep 26, 2016 9:33 am
Forum: Educational Links
Topic: Horn non-linearity frequency dependent
Replies: 11
Views: 2951

Re: Horn non-linearity frequency dependent

You can believe the sim or you can believe the actual results. Not that the sim is necessary wrong, but if the data entry isn't right, or the translation from simulation to plywood isn't right, then the sim prediction will be off. The measured impedance curve and frequency response (at 2.83V) match...
by MissileCrisis
Mon Sep 26, 2016 9:10 am
Forum: Educational Links
Topic: Horn non-linearity frequency dependent
Replies: 11
Views: 2951

Re: Horn non-linearity frequency dependent

Bill Fitzmaurice wrote:
MissileCrisis wrote:beyond a certain input threshold the response from 40-50 hz sucks out (compresses) almost completely, as in more input = same output.
The driver has reached xmax.
According to the sim that shouldn't be the case, not even close, excursion should be within klippel XMAX to full output.
by MissileCrisis
Mon Sep 26, 2016 8:47 am
Forum: Educational Links
Topic: Horn non-linearity frequency dependent
Replies: 11
Views: 2951

Re: Horn non-linearity frequency dependent

Driver, horn length (or hornresp inputs) would be helpful. Materials of construction and bracing amount would also be helpful. Voltage compression occurs would help.[/quote] Baltic birch with as much if not more bracing as Bill recommends for his subwoofers (bracing spaced every 6 inches throughout ...
by MissileCrisis
Sun Sep 25, 2016 11:47 pm
Forum: Educational Links
Topic: Horn non-linearity frequency dependent
Replies: 11
Views: 2951

Horn non-linearity frequency dependent

Hello, so I have a horn subwoofer question that has recently come up due to some measurements I've made with a horn loaded subwoofer I designed. Basically, beyond a certain input threshold the response from 40-50 hz sucks out (compresses) almost completely, as in more input = same output. The enclos...
by MissileCrisis
Wed Jul 01, 2015 4:38 pm
Forum: YouTube Links
Topic: T60 with a pair of custom top speakers using a measurement Mic
Replies: 0
Views: 8062

T60 with a pair of custom top speakers using a measurement Mic

Here is a recording with the sub set to ~+3 dB from the midrange. Song changes around to give different music styles.

https://www.youtube.com/watch?v=Ki2x_uG ... e=youtu.be

Song names in video.

Roughly 15-20 dB of headroom throughout the video.
by MissileCrisis
Sun Sep 07, 2014 6:04 pm
Forum: Build Threads
Topic: New THT build in Wisconsin
Replies: 61
Views: 8280

Re: New THT build in Wisconsin

There are listening positions in my room that look like my t60 is high passed around 35 hz, move to a different spot and monstrous lf, trust me when I say it's the room. Have fun moving the sub around such that the most even response is at your listening position as all small heck even medium rooms ...
by MissileCrisis
Sun Sep 07, 2014 2:42 am
Forum: Build Threads
Topic: New THT build in Wisconsin
Replies: 61
Views: 8280

Re: New THT build in Wisconsin

For the love of god don't play music through it before you stain it, it will never leave the house :loler: I love my T60 so being without a sub for 2 days while I painted it was tough. Best solution is have another BFM sub to tie you over (in case you ever decide you need 2 of these monsters).
by MissileCrisis
Sun Sep 07, 2014 2:38 am
Forum: Build Threads
Topic: New THT build in Wisconsin
Replies: 61
Views: 8280

Re: New THT build in Wisconsin

Made a crude jig for my RotoZip since I can't seem to find one of those router hole cutting templates. http://i1284.photobucket.com/albums/a579/howiez69/THT1/IMG_4128_zpsaa89b0b0.jpg It works, not as clean / square as a router, but not bad, only 1/8" kerf if you can call it that. http://i1284.photo...
by MissileCrisis
Sun Sep 07, 2014 2:31 am
Forum: Build Threads
Topic: OTop12 and T45
Replies: 15
Views: 2975

Re: OTop12 and T45

Don't forget to include the braces in your sheet layout, especially if doubling up on them. Definitely going to need to grab some more wood for this! Really diggin' the Cerwin Vega style bracing. Would like to use 3/8" if I go this route, or more Arauco. Now I just need to figure out how to brace t...
by MissileCrisis
Sun Sep 07, 2014 2:21 am
Forum: Build Threads
Topic: T39 20"
Replies: 37
Views: 4168

Re: T39 20"

Initially I'm ordering just a single 3012 driver, the speakon jacks and a pair of casters so I can get the cutouts right. I'll order the rest of the hardware later in the build process when it's relevant. Maybe I'll be less tempted to rush when I don't have boxes of pretty parts just begging to be ...
by MissileCrisis
Sun Sep 07, 2014 2:14 am
Forum: Build Threads
Topic: The start: 6 x T30's @ 24"
Replies: 68
Views: 9328

Re: The start: 6 x T30's @ 24"

Let me get this straight: you built a T30 from start to finish in 4 days. That's mighty impressive, took me 3 weeks to do my T60 (albeit was working nights and weekends). I've resorted to simpler builds Such that I can knock out a build a week (nothing like a 7 panel + bracing/corner simple TH for s...
by MissileCrisis
Sun Sep 07, 2014 2:04 am
Forum: Build Threads
Topic: Truck Tuba by a Teenager
Replies: 32
Views: 6347

Re: Truck Tuba by a Teenager

Right? I can't believe it's been almost 3 years since I built my first horn-loaded box. I think the TrT is going to be a good all-around sub. Not for HT and not for an outdoor concert, but perfect for daily listening and small house parties. I've lived in the dorms, two different ones-- been in a h...
by MissileCrisis
Tue Sep 02, 2014 2:44 pm
Forum: Reviews
Topic: BFM vs. JBL/DAS
Replies: 5
Views: 2489

Re: BFM vs. JBL/DAS

If I ever do outdoor gigs I will recommend having 140+ dB sub potential (theoretical) on tap such that you can run a solid 115+ in the middle of the crowd with 3 dB + of headroom. For my custom boxes that would be 8 subs or roughly ~70 cu. ft. worth. Of course then you need roughly 8kwatts but that'...