I have 4 of the SI HT 18, doing 4 single boxes and now the box vol is around 6 cuft, I can go bigger in vol if needed, box designer is saying at 6 cu ft 20hz tune is best...I was wanting a lil lower tune ( like 16 HZ) , he says its not safe? I see plenty of guys doing tunes this low , what...

I just finished my ultimax 18 build. And am quite happy with it. I tuned it to 18hz and 10cft internally. I was very meticulous with the port length and box volume calculations but I wanted to see where the box tune would unload. I played sine waves 1/6 octave and the port seems to unload at...

(2) Infinity REF1262W, 9 ft3 (net), 18 Hz tune, BASH 500W F3 at 22 Hz. F6 at 17 Hz. 107 dB at 16 Hz. 111 dB at 20 Hz. 115 dB at 40 Hz. All 1 m GP. SPL is shown at Xmax (13 mm) of drivers. Stock Bash HPF (Fc 17.36, Q 0.817) is included for all graphs. Peak port velocity of 23.5...

Hello all. My mobile dj rig consists of two Alto powered 12"s pole mounted on top of two unpowered Harbinger 18"s, a balanced Minidsp, and a Umik-1 USB mic. Audio is normally fed from my NI Audio 10 into a Pioneer DJM-707 and then to the Minidsp and on to the speakers and amps. The Alto's are...

Im new to diy audio and am going to do a subwoofer build. Im fairly handy with woodworking and tools. Im getting a Stereo Integrity HT 18D2 and going to do a sonotube sub. Ive been messing around with the sonosub exe program but am confused about what to tune my ebclosure to. after reading many...

Hello All, I had Graham draw me up some plans for this project. Going to do a dual SI 15" D2 ported box. It will be 12 cu ft tuned to 15 Hz. It will sit under my projector screen and will house my center channel speaker. I will be powering it with a fan/heat sink modded Behringer iNuke...

Leaving the real life trade offs aside, just judging by the FR alone, how much difference would the slightly better LF extension in the lower tune version make in practical terms? Is this something readily audible? thank you

Time to kill off some spare parts. I bought an 8" Dayton a few years ago and never got around to utilizing it. So I'm using some leftover 1/2" MDF and a 20 year old 100W plate amp I ripped out of a 12" Pioneer sub before I chucked it. This will be a little sub to put in my garage along with...

Hi all! Well, I just received my new dual PC13 Ultra Cylinders (replacing dual 20-39 PC+ cylinders), and I now need to decide what tune is safe for me to run in (the main cause for the upgrade in the first place). With the PC+ Cylinders (20Hz tune), I was extremely careful (paranoid?) about...

Kevin had a brief sale on 21" Mal-X drivers, since the 18" drivers were unavailable. I couldn't resist, so I bought one. I waffled back and forth A LOT between a sonosub and a MDF cabinet. I finally found a good supplier for 28" sonotube and then decided to go the MDF route because at some...

So, I decided to build a second one, so I have a matching pair.. Here is my old build thread: http://www.hometheatershack.com/forums/ported-subwoofer-build-projects/43095-dual-evx-180b-17-cuft-25hz-ported.html It's around 17 cuft, with a 4" slot port tuned to 25 hz. It's not a high excursion...

I have decided to take Thomas-W's advice and build a manifold on my door to house (4) Fi IB3 18's on the top and make 2 slot ports on the bottom out of the rectangles already there. The door is 1.25" thick, I will make a template/face of the entire door adding .75" to the thickness. I'll make a...

A few months ago my older model tube tv began making a low buzzing sound whenever it was on. I was unable to pinpoint the location of it. No changes of the environment had occurred when it started. It is fairly old so I'm assuming it is just a part going out. I have removed the back cover...

Hi Chaps, I have a question to ask.... As you or most off you may be aware I am making two subs with 3 frequency tunes. Tomorrow I will be setting them up and re running Audyssey. From memory I ran Audyssey first and tweaked if needed be with the BFD (although I have a flat response so the...

Finally got one of my 4 subs up and running. I dont have pics of the subs mounted in the box yet. Man google sketchup is misleading as far as scale. LOL

Would it be a wise to tune your sub to about 10 hz, but have you hpf set at 15 hz to help with driver over excursion? The reason I ask is, to acheive about a 10-13 db increase at 10 hz that is what I would have to do.