The next project I want to do is an inexpensive subwoofer for a small to medium size room. It does not need to play extremely loud. The box can be up to about 1 cu ft.
I'm looking at an Apex Jr 8" with a 6 to 8" long 2" diameter port and a 100 watt plate amp.
Any recommendations?
I'm looking at an Apex Jr 8" with a 6 to 8" long 2" diameter port and a 100 watt plate amp.
Any recommendations?
On a related note -- Are there any inexpensive plate amps that have a low level boost? All the ones I've seen that have boost at the low end cost $130+.
I'm sure you could build a shelving circuit for $10-20 that would fit your application perfectly.
Search for Linkwitz Transform.
Search for Linkwitz Transform.
Most sub amps can be modified with 2 resistors to provide any bass boost you want. I bought the $90 (with free shipping) 100 watt sub amp from Parts Express. It came with a 6dB 35hz bass boost.
Okay, let's assume I can find an appropriate plate amp. How about the driver? Is there a better candidate than the Apex Jr Super 8"?
Can anyone point me at a completed design?
Dave
Can anyone point me at a completed design?
Dave
Okay, let's assume I can find an appropriate plate amp. How about the driver? Is there a better candidate than the Apex Jr Super 8"?
Can anyone point me at a completed design?
Dave
Can anyone point me at a completed design?
Dave
Parts Express provides suggested box sizes for most of their Dayton drivers. I followed their box recommendation with their DVC 8" woofer. I used their $100 300-792 plate amp. This combination provides a little extra output at 35hz, but when I find time I'll change the resistors to fix that. Since most of the music I listen to doesn't have much content that low, and the extra output for movies is pretty nice, I seem to never get around to changing it...
If you're looking for an inexpensive sub project that sounds great, this is a great place to start.
If you're looking for an inexpensive sub project that sounds great, this is a great place to start.
Jim85IROC said:
Cool. The price is sure right. In fact, it makes me think something must be wrong with the thing. Hmmm.
Where do you find the recommended enclosure specs?
Thanks.
I haven't heard one but the TangBand W8-740C is $32.50 from...
http://www.nuera-acoustic.ca/products.html
The only apperent downside is efficiency of 84dB/W. Xmax is quoted as 12mm but I suspect that is peak-to-peak, not one way. Still higher than the ApexJr's 4.9mm though.
I've had very good sucess with a Peerless 831858 8" dual VC driver I got from Madisound for $27.50 as a close out special (no longer listed so I guess they've sold out). Power is quoted at 200W (100W per VC) and Xmax is very respectable at 7mm. I use it in 1 cu ft sealed and a bit of Linkwitz transform boost really helps the low end. This limits the maximum SPL but it plays nice and low at sensible volume levels with out distorting noticibly.
Nice one,
David.
http://www.nuera-acoustic.ca/products.html
The only apperent downside is efficiency of 84dB/W. Xmax is quoted as 12mm but I suspect that is peak-to-peak, not one way. Still higher than the ApexJr's 4.9mm though.
I've had very good sucess with a Peerless 831858 8" dual VC driver I got from Madisound for $27.50 as a close out special (no longer listed so I guess they've sold out). Power is quoted at 200W (100W per VC) and Xmax is very respectable at 7mm. I use it in 1 cu ft sealed and a bit of Linkwitz transform boost really helps the low end. This limits the maximum SPL but it plays nice and low at sensible volume levels with out distorting noticibly.
Nice one,
David.
I built a dual W8 sub which sounded pretty good. The last two issues of Audio Xpress featured "apartment" subs. They used the MCM 55-2421, MA-Audio MA80XE and the Tangband. The W8 ended up with the best performance of those three.
Parts Express has(d) a 10" sub with 100wrms for $110. I ordered one last week. Not too shabby. Has variable xover pt and level control, phase switch and line or spkr lvl inputs. Check online for latest flyer.
I found the specs printed in their catalog, but there's a pdf file on the website under the driver description that offers a similar design.Dave Jones said:
Take a look at www.rawacoustics.ca. They have an 8" sub kit using a Tang Band driver and 100 watt plate amp. It's available as a kit or assembled, finished or un-finished. You can also get it ported or with a passive radiator. I have this sub, with the passive radiator and use it for home theater. It works great in my room which is 12 x 20. I'm very happy with it.
MikeR said:
Thanks much for the suggestion. I am checking it out.
Nit: This BB software includes the period after the URL when you click. The browser tries to go to the faulty URL, then the name-server highjacks the attempt and puts up an ad. I'm getting a "server error" message even with the correct URL. Hmmm. Click this: www.rawacoustics.ca
Now then... Do you happen to know the answers to these questions?
1) What's the internal volume of the enclosure?
2) What frequency is the box tuned to?
3) What is the Q of the bass boost on the amp?
... and I thin que.
daatkins said:
I am 99.9% sure it is one way. Pretty impressive eh?
I would definitely port the 8" subwoofer. 1 cubic foot is plenty of space for the necessary volume and port displacement. The added output is worth it.
Actually IMO 1 cuft is too much for Tangband, it works best
around 14L (0.5 cuft) tuned between 25 Hz and 35Hz.
5L to 10L sealed also looks good.
🙂 sreten.
around 14L (0.5 cuft) tuned between 25 Hz and 35Hz.
5L to 10L sealed also looks good.
🙂 sreten.
http://www.allelectronics.com/cgi-bin/category.cgi?category=937&item=SWA-6&type=store
Looks like outstanding value to me.
🙂 sreten.
Looks like outstanding value to me.
🙂 sreten.
sreten said:
That was my concern with the kit from rawacoustics.ca, which appears to use a 1ft^3 box.
- Status
- Not open for further replies.