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Forum: DIY Subwoofers - General Discussion   10-12-15, 07:50 AM
Replies: 12
Views: 1,619
Posted By colofan
Re: first personal build. 2 si ht 18's?

Crown power amps are worth every cent (in my opinion). Reliable and a real company to support them.
You might consider a different alignment other than infinite baffle for efficiency sake though.
Forum: Ported Subwoofer Build Projects   10-12-15, 07:46 AM
Replies: 7
Views: 1,483
Posted By colofan
Re: Need advise Newbie here

Is it the surrounds that let go? You can find kits for repair or a recone kit as well. Google search for a recone kit. Typically you can repair fairly easily.
Forum: Mobile Audio   06-19-15, 02:09 PM
Replies: 5
Views: 2,131
Posted By colofan
Re: Sound Qubed Subwoofers

Since this is a home theater forum asking about car mobile applications is difficult to answer.

A small sealed box with high enough power to overcome the really low sensitivity will produce okay...
Forum: Ported Subwoofer Build Projects   01-20-15, 06:34 PM
Replies: 33
Views: 4,278
Posted By colofan
Re: Seeking for help,

http://www.diysubwoofers.org/prd/

I linked above a site that provides the need conversion information.
Forum: Ported Subwoofer Build Projects   01-19-15, 06:35 PM
Replies: 33
Views: 4,278
Posted By colofan
Re: Seeking for help,

I would consider using a passive radiator design instead of a port.
Forum: Ported Subwoofer Build Projects   12-16-14, 04:49 PM
Replies: 39
Views: 5,403
Posted By colofan
Re: Ported how low is too low?

I moved to tactile devices below 18 Hz. More effective if done right and easier on the house foundation:)

Taking a driver that has Fs of 21.3 and lowering it by 1/2 octave in a large box Xmech...
Forum: Ported Subwoofer Build Projects   12-02-14, 08:51 AM
Replies: 5
Views: 1,284
Posted By colofan
Re: Need help on Sonosub Dimensions.

6 inch tube diameter might be too small. Port velocity might be too high and cause noise.
Forum: Ported Subwoofer Build Projects   08-18-14, 06:34 PM
Replies: 52
Views: 15,799
Posted By colofan
Re: SI 18" SonoTube

I had that happen with and old craftsmen router. I got rid of it. A poor fitting collet is nothing to manage with. I would suggest getting a replacement collet or a different router this can be...
Forum: Sealed Subwoofer Build Projects   02-12-14, 08:55 AM
Replies: 201
Views: 74,690
Posted By colofan
Re: Stereo Integrity 18" D2 Curved build!

If you are looking for something in the red color. Try out Bubinga....Quilted version of this looks pretty good. Also another chose on veneering is to use yellow glue on the veneer and reheat with an...
Forum: DIY Subwoofers - General Discussion   01-09-14, 09:55 AM
Replies: 33
Views: 4,461
Posted By colofan
Re: Seeking advice on first DIY subwoofer

If you are using birch ply or any kind of veneer product an up spiral bit can cause breakout to occur. Cleanest cut is to use an undersized up spiral followed by a down spiral bit to not damage the...
Forum: Ported Subwoofer Build Projects   12-20-13, 08:50 AM
Replies: 14
Views: 2,513
Posted By colofan
Re: Porting SI -18" subwoofer

The number of ports is really about the velocity of the air when the port is operating a full output. Modeling will give you the information about port size and and length of port to get the tuning...
Forum: Sealed Subwoofer Build Projects   12-19-13, 12:46 PM
Replies: 201
Views: 74,690
Posted By colofan
Re: Stereo Integrity 18" D2 Curved build!

One of many companies that make them.

http://www.atsacoustics.com/corner-bass-trap-b.html
Forum: Sealed Subwoofer Build Projects   12-19-13, 12:38 PM
Replies: 201
Views: 74,690
Posted By colofan
Re: Stereo Integrity 18" D2 Curved build!

A quick couple of questions.
Are your mains also reproducing mid-bass? You might have a phase reversal going on in the mains in that range that could cause an issue. Easy to fix that just flip the...
Forum: Ported Subwoofer Build Projects   12-19-13, 12:29 PM
Replies: 14
Views: 2,513
Posted By colofan
Re: Porting SI -18" subwoofer

I guess a bit confused about which driver you are using is it the 15 or 18 HT?

I tuned to 22Hz and then used active EQ to smooth out the response below tuning. The xmax is large enough that power...
Forum: DIY Subwoofers - General Discussion   12-19-13, 11:30 AM
Replies: 12
Views: 2,309
Posted By colofan
Re: Laminating Sub cabinet in real wood?

Wood moves and the thicker the more it will. Just keep this in mind when attaching the solid wood to the substrate. Across the width is where most of the movement occurs. I have yet to see a sealer...
Forum: DIY Subwoofers - General Discussion   12-18-13, 08:53 AM
Replies: 12
Views: 2,309
Posted By colofan
Re: Laminating Sub cabinet in real wood?

Use a veneer and you will be fine. Thicker wood can expand and contract a lot based, mostly on humidity changes and actually warp and crack. Sometimes you can get sheets with factory applied veneer.
Forum: DIY Subwoofers - General Discussion   12-16-13, 08:59 AM
Replies: 5
Views: 1,196
Posted By colofan
Re: Are low frequency sine waves dangerous to the speaker

Pink noise with a bandpass filter will do the job.
Forum: Sealed Subwoofer Build Projects   12-12-13, 06:24 PM
Replies: 8
Views: 2,440
Posted By colofan
Re: 18" SI or Dayton?

I seen designs as small as 5 cuft in the ported design though you might have to add EQ.

What size were you looking at?

I would be interested in the Dayton UM as well.....just when will it be...
Forum: Sealed Subwoofer Build Projects   12-12-13, 09:07 AM
Replies: 8
Views: 2,440
Posted By colofan
Re: 18" SI or Dayton?

Just went theough this and went with the SI. I have installed it recently in a 7 cuft 22Hz tuned box. On the ported portion of this website I just posted T/S parameters I generated from the driver.
...
Forum: Ported Subwoofer Build Projects   12-09-13, 10:43 AM
Replies: 1
Views: 1,798
Posted By colofan
Re: SI HT 18 ported design

I could post impedance curves if that is desired from the forum.

Noted is that above results are a minimum of 2 hour breakin at 10 watt free-air 35 Hz.

I will be doing box tests and modeling...
Forum: Ported Subwoofer Build Projects   12-09-13, 10:41 AM
Replies: 1
Views: 1,798
Posted By colofan
SI HT 18 ported design

Just the beigninning of a box modification from JBL 2240H to a SI 18-DT4.

Box size is 7.03 cuft.

I measured using LinearX LM using power and mass as follows.
Power tests were 0.1 ,1,10...
Forum: DIY Subwoofers - General Discussion   11-18-13, 01:01 PM
Replies: 77
Views: 17,410
Posted By colofan
Forum: DIY Subwoofers - General Discussion   11-18-13, 12:05 PM
Replies: 77
Views: 17,410
Posted By colofan
Re: Stereo Integrity Sub Questions

In the next couple of weeks I will be converting my HT sub's from JBL 2240H into SI HT18. Not sure if a seperate thread is where i want to do this or attach to a current thread.

My toolsets for...
Forum: Speaker and Subwoofer Reviews   11-18-13, 11:54 AM
Replies: 1,074
Views: 106,416
Posted By colofan
Re: The Official $2,500 Speaker Evaluation / Home Audition Event

I see the results and two items jump out at me. The models that you preferred were easier to setup and looking at the graph off-axis measurements bore this out (all about the power response). ...
Forum: Home Audio Speakers   11-18-13, 11:54 AM
Replies: 1,087
Views: 178,502
Posted By colofan
Re: The Official $2,500 Speaker Evaluation / Home Audition Event

I see the results and two items jump out at me. The models that you preferred were easier to setup and looking at the graph off-axis measurements bore this out (all about the power response). ...
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