hidden subwoofer opinions

Typically the bigger the sub the lower it'll hit. I'd go with a shallow 10" or 12" if you wanna keep it in the same area and get a custom box made

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Not necessarily, it all depends on the enclosure actually.

Not necessarily, it all depends on the enclosure actually.

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Enclosure does have a lot to do with it but bigger sub's can usually hit them lower frequency's easier at least in my experience

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I ran a pair of the DD red line 608s tuned at 30hrtz, that hit lower than my level 4 DC 12, in the same size enlosure with similar tuning.

i'd like to keep it as a off the shelf system if possible. the pioneer's are rated down to 20hz, but i don't see how that is possible with only .15 cubic ft of box

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If you want to hit low frequencies you'll need a custom box prefab boxes are ****

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U need to figure out how much space you have and then I'd build 1 8" ported box of you can fit it.. Maybe a sundown 6.5" or American bass or massive audio 6.5".... Shallow mount woofers suckkkkkkkk so baddddd... If you like the pioneer u have now just build a new enclosure tuned lower if that's what u want.

The alpine sub is actually a decent little sub. I put one in the hatch of an ex's car and it got decently loud and low . If it was me I'd set a depth guide on a drill bit and perforate the wood/ metal in front of the sub. But you're an 1/8th off the grill and not the surround so you should be ok

how is this helpful? Looking at the alpine box it looks like they spent alot of time on box design, unlike the pioneer i have which is just a simple sealed box.
i'm leaning towards picking up the alpine up, but i'm a bit concerned with the subwoofer so close to the false floor. This being a ported design would that mean most of the sound is coming from the port vs the face of the sub?

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This sometimes isn't true with company prefab set ups. The alpine is a very nice box but the design may not help you hit low notes. A lot of the prefab or factory boxes have higher tuning and my get louder but drop off under tuning. Ive heard the alpines and they didn't have any low end to me. The shop here that sells them does there own custom box for the alpines unless the customer just wants a set it and forget option. They get more out of them in their box compared to the alpine box. The shop also got in some DD prefab set ups with the sub included and the shop figured out the tuning was close to 40. They got loud but again didn't have low end. I would measure your space and get a nice box designed around goals and find a sub that fits.

Keep us updated. I have always been intrigued with that enclosure

its good for what it is. I heard the alpine for the 8" and the 6" a couple of times. People who have had subs before think they lack. People that don't really care like my wife or somebody that doesn't want any custom would think its pretty good. We also have to keep in mind that its a single 8" on usually limited power. Its not going to set the world on fire.

Buying a second of the same sub won't get you lower bass.

Also this freq rating don't say anything about the response curve...most small and shallow drivers drop off way before 20hz even though they can technically produce a 20 hz tone.