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Discussion Starter #1
Hey guys, I'm a regular around AVS and DIYMA but wanted some input from you DIY guys. I've been using the very first Atlas 12" that Chad K sold a number of years back in the car and have now had it in HT duty for the last year maybe. I've noticed that it has noticeable tinsel/mech noise (not from bottoming out,etc) during higher excursion which correlates with what Npdang (founder of DIYMA) found in a comparison with a TC Sounds TC2+ sub.

I may try a suggestion to add a piece of material to quiet the slap though I'm afraid of disturbing cone mass.

Either way, I'm using a sealed 2-2.2cf enclosure I got from a Deep Surplus closeout paired with a Dayton 240w plate amp. The Atlas is pretty efficient and does very well w/this amp so I'd like to find something that's able to work well off this amount of power.

I've been considering some offerings from PE like the Dayton Quatro and DVC though they seem 'inferior' to the 18mm of xmax, SQ and output that the Atlas provides. The HO and Titanic need much more power (500-700rms) and the HF seems to prefer a larger enclosure.

Other than the more expensive ShivaX from Exodus, I'm not sure what else to look for. The ShivaX, around $230 is about as expensive as I'd like to go. I'm actually happy w/the output of the Atlas, so I don't need anything beastly at this point.

Any input you have is much appreciated and I love the builds here!


Jeremy
 

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Discussion Starter #3
Mike, I have the 240w plate amp w/the 6db boost at 30hz...

Honestly, I'd rather hold off on building another sub enclosure since I'm happy with this one. Were you perhaps suggesting a larger ported enclosure so that I could use a higher performance sub while keeping my smaller 240w amp? For now, I'm going to try and stick w/the sealed enclosure even if I simply have to try and a better tensil slap pad to the Atlas.

I also have a couple of car subs though I'm not sure how well they'll do. One is a 12" Treo TSX and the other is a Diamond D6 12". I dunno, is there anything else out there that'll perform as well as the Atlas or do I really need to upgrade to a 500w plate amp? Here's a partial pic of the LR but I'm actually happy w/the output I have. It's about 20'x20'x14' high not including the kitchen, entry and hallways...
EDIT: Can't show p'bucket link yet..

Thanks guys

Jeremy
 

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Discussion Starter #5
Atlas 12" T/S: And I'm using the recommended Low Q config: Watching Transformers2, it can rattle pictures 3 rooms down. It's not a huge house but about 2000sf. I have to smile everything I hear how this single 12" with 240w and a sealed box sounds:)

Low Qts Specs
Fs 23.2 Hz
Qms 4.9
Qes .354
Qts .33
Vas 128.5 L
Re 2.8 ohms
Znom 4 ohms
Xmax 18 mm
Sd 481 cm2
Mms 119 g
Vd 1.73 L
RMS Power 300 watts
BL 11.7
Spl 1W/1M 88.5 dB
Spl 2.83V/1M 92.6 dB
Le .86 mH
Cms .395 mm/N
No. .442
Cutout 11.125"
Diameter 12.5"
Depth 6.5"
Weight 21 pounds

Mid Qts Specs
Fs 23.2 Hz
Qms 4.9
Qes .465
Qts .415
Vas 128.5 L
Re 2.8 ohms
Znom 4 ohms
Xmax 18 mm
Sd 481 cm2
Mms 119 g
Vd 1.73 L
RMS Power 300 watts
BL 10.2
Spl 1W/1M 87.2 dB
Spl 2.83V/1M 91.4 dB
Le .86 mH
Cms .395 mm/N
No. .336
Cutout 11.125"
Diameter 12.5"
Depth 6.5"
Weight 21 pounds

High Qts Specs
Fs 23.2 Hz
Qms 4.9
Qes .581
Qts .52
Vas 128.5 L
Re 2.8 ohms
Znom 4 ohms
Xmax 18 mm
Sd 481 cm2
Mms 119 g
Vd 1.73 L
RMS Power 300 watts
BL 9.1
Spl 1W/1M 86.3 dB
Spl 2.83V/1M 90.5 dB
Le .86 mH
Cms .395 mm/N
No. .271
Cutout 11.125"
Diameter 12.5"
Depth 6.5"
Weight 21 pounds
 

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Discussion Starter #8
Sorry for the delay Mike, in and out all day...I couldn't remember off the top of my head but it's 2cf net after speaker and amp figured in. I also have a pound or two of fill to give it a little more headroom w/the smallish Dayton amp.

Also an update (to my chagrin): I found the major source of the noise- A leaky allen bolt! The t-nut must be damaged or not perfectly aligned because it's very hard to turn the allen bolt while the other bolts turn easily. So not being able to tighten the leaky bolt further and not having any rubber/neoprene washers around, I made one. I took a rubber ceramic tile spacer (+ shaped), drilled an appropriate sized hole in the middle to fit the bolt, then carefully cut the excess rubber off. Sealed the bolt up nicely.

However, I still want to upgrade subs which, if it requires doubling of power to a 500w amp, so be it...

So the hunt is still on. 2 cf sealed enclosure, 240w (500w if needed) amp and 70/30 movies/music.

Jeremy
 
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