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-   -   First HT DIY Subwoofer for a noob on a budget.. (https://www.hometheatershack.com/forums/sealed-subwoofer-build-projects/68743-first-ht-diy-subwoofer-noob-budget.html)

jeffrobinson 07-24-13 01:58 PM

First HT DIY Subwoofer for a noob on a budget..
 

Good evening gentlemen,
I'm a noob who bought a pair of Phoenix Gold Ti15d's from Sonic years ago planning to stuff them in a suv. Fast forward 9 years, they were never installed. Want to build a home theater sub for the kid and I need the right box the first time due to a state employee budget. Picked up a Bash 300w amp at partsexpress for one Benjamin. Phoenix recommended a sealed 1.5ft for sq, or a 3.5ft ported w two 4x9.75in ports. Are these still the best choices? Those were speced for car use and that was a long time ago. I have bassbox pro 6 and cant figure it out. Everybody says go low for home theater and I'm stumped. Anybody up for a little bench racing? Specs are:
Fs: 26.21HZ
Re: 1.75 Ohms
Qms: 9.26
Qes: 0.594
Qts: 0.558
Vas: 114.63 liters
Mms: 283.15 grams
Cms: 130uM/Newton
BL: 10.89 Telsa-m
SPL(1w/1m): 88 db
Sd: 792 sq cm
Xmax(field): 36.2mm p-p
Size of enclosure is dosent matter, its in my living room. I want low, right? My front mains go to 65hz, receiver is Yamaha with YPAO room eq, room is 15 by 20 or so with 12ft ceilings and hardwood floors. Use will be 95% movies, 5% metal. Anybody feeling like helping out?:huh: Thank yall in advance, Jeff.

Mike P. 07-24-13 02:08 PM

Re: First HT DIY Subwoofer for a noob on a budget..
 

Welcome to the Home Theater Shack, glad to have you with us!

Are the subs single 2 ohm or dual 2ohm?




jeffrobinson 07-24-13 02:15 PM

Re: First HT DIY Subwoofer for a noob on a budget..
 

They are dual 2ohm. Was only planning on using one sub. Thinking I should keep the other for back-up.

Mike P. 07-24-13 02:17 PM

Re: First HT DIY Subwoofer for a noob on a budget..
 

OK, I'll do the modelling tonight when I get off work.




jeffrobinson 07-24-13 02:26 PM

Re: First HT DIY Subwoofer for a noob on a budget..
 

Awesome!! And thank you for responding so quickly.

Mike P. 07-24-13 08:43 PM

Re: First HT DIY Subwoofer for a noob on a budget..
 

1 Attachment(s)
The Phoenix recommended box sizes are for a car application which gets an extreme amount of cabin gain to boost the low end. A home interment doesn't get anywhere near that much gain so the box needs to be bigger to get the low end bass.

The driver/amp combo models well in 10 cu.ft. (net volume) tuned to 18 hz. Porting will require two 4" flared ports 17" long each. Modeling shows 104 db at 17 hz without any room gain you may get.

Attachment 43229




jeffrobinson 07-24-13 10:03 PM

Re: First HT DIY Subwoofer for a noob on a budget..
 

Thank you very much! I must admit I wasnt expecting a box that big. Bet you've heard that before!This build will test the bounds of WAF, but I test this regularly, LOL...Guess this box will have to be the base of my DIY entertainment center. Recommend any threads that would provide guidance on my journey through a build of this size?

Mike P. 07-25-13 12:51 AM

Re: First HT DIY Subwoofer for a noob on a budget..
 

1 Attachment(s)
It doesn't have to be 10 cu.ft., 6 cu.ft. would be the size of a 24" cube. You can make it whatever you're comfortable with.

Attachment 43230




jeffrobinson 07-25-13 10:32 AM

Re: First HT DIY Subwoofer for a noob on a budget..
 

Nope, I dont want to leave anything on the table and wonder what I was missing. Will the sub have a decent life expectancy in this set up? High excursion related fatigue? The reason I ask, I may get itchy and dig out the "back up" driver. I heard this "give me more" syndrome is common..LOL.

Mike P. 07-25-13 11:25 AM

Re: First HT DIY Subwoofer for a noob on a budget..
 

When I get of work I'll post a graph of what the sub is capable of. Any idea what the power handling is?





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