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-   -   Getting low bass from a small woofer at low volume. (http://www.diyaudio.com/forums/subwoofers/241058-getting-low-bass-small-woofer-low-volume.html)

bradsworth 19th August 2013 09:49 PM

Getting low bass from a small woofer at low volume.
 
I'm starting a new project and would appreciate some input from those with more experience than me.

Goal.
To design and build a stereo system for low to moderate listening levels, that will produce flat (ish) frequency response down to 35Hz.. that is small enough to take into work without drawing a bunch of attention to myself.

Budget <$300.

This will be a 2 way bookshelf + subwoofer system utilizing fountek FR88ex mids (probably) and Vifa XT25SC90-4 tweets. I am undecided on a sub woofer yet, but would like to stick with as small of a woofer as possible. 6.5 inch or less.


I wonder how Dayton Audio ND105-8's will perform as a sub woofer in a bass reflex box, or something of the sort.

I have so little free time on a computer that will allow me to do some modeling of speaker boxes, so I would appreciate any technical input I can get on the matter of a box for that particular woofer.

I do not have a problem building a large box, and a passive radiator may be a viable option, I just don't want to lug in an enormous box with a 12 inch woofer in it. my boss would probably ban radios immediately as soon as he saw it. :D ANYWAYS!


Andersonix 19th August 2013 10:00 PM

Low bass needs to move air, but I don't see that happening with a 6.5 inch.
How about two 8 inch woofers mounted face-to-face (isobaric)? This permits the box to be half the volume needed for a single woofer.

zobsky 19th August 2013 10:06 PM

Quote:

Originally Posted by bradsworth (Post 3601829)
I'm starting a new project and would appreciate some input from those with more experience than me.

Goal.
To design and build a stereo system for low to moderate listening levels, that will produce flat (ish) frequency response down to 35Hz.. that is small enough to take into work without drawing a bunch of attention to myself.

Budget <$300.

This will be a 2 way bookshelf + subwoofer system utilizing fountek FR88ex mids (probably) and Vifa XT25SC90-4 tweets. I am undecided on a sub woofer yet, but would like to stick with as small of a woofer as possible. 6.5 inch or less.


I wonder how Dayton Audio ND105-8's will perform as a sub woofer in a bass reflex box, or something of the sort.

I have so little free time on a computer that will allow me to do some modeling of speaker boxes, so I would appreciate any technical input I can get on the matter of a box for that particular woofer.

I do not have a problem building a large box, and a passive radiator may be a viable option, I just don't want to lug in an enormous box with a 12 inch woofer in it. my boss would probably ban radios immediately as soon as he saw it. :D ANYWAYS!


Isobaric or bandpass.

You could also use a high excursion small sub in an undersized box and use a linkwitz transform to boost the low bass.

OscarS 20th August 2013 01:32 AM

Quote:

Originally Posted by Andersonix (Post 3601845)
Low bass needs to move air, but I don't see that happening with a 6.5 inch.
How about two 8 inch woofers mounted face-to-face (isobaric)? This permits the box to be half the volume needed for a single woofer.

low bass at ear blistering levels needs to move air. Technically all bass needs to move air, but you catch my drift. He is not looking at concert sound pressure levels. A quality 6.5 "subwoofer" in a properly designed bandpass can achieve good sensitivity and low-end response.

bradsworth, at what frequency do you anticipate you'd want to cross over to the satellite/high-freq. speakers?

bradsworth 20th August 2013 04:23 AM

I think 8's would be much to heavy and large to be inconspicuous. although I would prefer it. I also want to keep my power requirements down, so a single woofer is preferred. I think I will be safe crossing my mids down to 150Hz or so, I may go with a larger midrange to get closer to 80 or 90Hz if it will significantly help my bass extension with the subwoofer. I really want to base this entire design around accurate music reproduction. specifically in the bass frequencies, where my current work radio completely lacks. For pure entertainment purposes, I will reveal what it is. :o don't make too much fun of me though

A 10 or so year old pioneer head unit, powered by an old computer's power supply, driving 2 kicker component speakers I took out of a buddy's car when I upgraded his sound system. The entire thing cost my exactly nothing to build. save the hour it took to build and enclosure out of 3/8th inch plywood and some soldering. oh yea, and the duct tape and sharpie to make it look like an 90's boombox. It is my temporary solution until I have a decent system put together :D I was surprised how well it was received. everyone at work wants one. hahaha

Zonneschimmel 20th August 2013 10:24 AM

Cerberus

6.5 inch Tang Band W6-1139SC in a 11 inch cube. Vented, f3=35Hz, will do about 100dB at 50W before excursion limit.

bradsworth 20th August 2013 03:36 PM

Wow, thank you for leading me to that site. I found it a while back, but havn't been able to relocate it. That is pretty much exactly what I'm looking for. With mild modifications it should work well.

Cal Weldon 20th August 2013 04:57 PM

Good little woofer. I am pleased with mine.

OscarS 20th August 2013 06:07 PM

I have two of those TB subwoofers. Bought them before the price of Neo skyrocketed. Too bad you can't get them for the $40 listed in that build list, lol. The ceramic version is $4X.00 though.

bitSmasher 20th August 2013 10:37 PM

Quote:

Originally Posted by bradsworth (Post 3601829)
flat (ish) frequency response down to 35Hz.. that is small enough to take into work without drawing a bunch of attention to myself. ...my boss would probably ban radios immediately as soon as he saw it.

What environment is your work? this is almost contradictory, in that you don't want attention but you want good bass response... will the environment be conducive to bass reproduction?


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