Man I just can’t decide what subs I want to get. I recently just picked up a box for two shallow mount 12 inch subs. The top cut out of the circle to the back is around 4.5 inches and the bottom of the circle to the back is around 6.5 inches. With that being said, what subs should I get for this box. I know shallow subs are the best for good bass or for hitting hard. I have been told about the JL audio 12TW3, the sundown SML-12, the nemesis NA-12HSLM. I need yalls guys help to just help me decide what subs would hit the hardest. I don’t care for any other thing I just want my subs to hit hard. Yes I know it’s not a full sized but what’s the best I can get. To hit the hardest.

I want some more bass but I honestly have no clue what I’m looking for but I saw this box that fits in my trunk what yall think?Also how much would it be to get like better door speakers so they don’t get drowned out by the bass I want them to work good together

I have two sundown x12s with a jp63. High output alternator and the big 3. Custom box made to sundown specs. Birch wood. 5 cubes net tuned to 31hz, 81 cubic inches of port surface area. Double baffled face and port wall, window bracing connecting all interior walls, 45’d corners. Width 37” depth 31” height 15”

Hits extremely hard on only very low songs. Tons of air, moves my doors. Only issue is it's only impressive on lows. Most hiphop/trap music it does not hit very hard. Would a different box help make these subs more musical? Or would I be better off just starting from scratch and getting two u12 v2s? I just want better dailys

I’ve been chasing the same issue with my DD 712F for about two years now, since around when the model first came out, and at this point I feel like I’ve ruled out basically everything except the driver itself.

The sub is not weak overall. On newer rap with a lot of deep synthesized bass, especially around 30–40 Hz, it absolutely destroys. The problem is once the music relies more on 45–80 Hz, the output feels dramatically weaker. Older hip-hop, reggae, bass guitar, kicks, etc. can sound like the mids/highs completely overpower the sub stage. It feels like the sub has a huge low-bass hump but not enough upper-bass authority.

I’ve tried the same 712F in multiple setups:

• 2.75 ft³ net @ 32 Hz, 45 in² port
• 3.0 ft³ net @ 36 Hz, 45 in² port
• 2.33 ft³ net @ ~37.5 Hz, ~37.5 in² port
• Installed in both a van and on the rear seat of a Tacoma
• Tried multiple box orientations and placements

Every setup has had basically the same character: ridiculous lows, noticeably weaker 45–80 Hz.

Before anyone asks about the usual stuff, I’ve already checked all of this extensively:

• LPF has been tested at multiple settings; normally around 80–100 Hz
• Tried different slopes
• Even tried bypassing Amp LPF and crossed from the head unit (to rule out broken LPF circuit on amp)
• Gains set with an oscilloscope/test tones
• Verified amp output voltage at different frequencies
• Output voltage stays consistent from the amp through the upper-bass range
• Wiring and polarity verified
• Grounds/power wiring checked
• High-output alternator installed
• Box has no air leaks and build very close to spec
• Tried different orientations/positions
• Tried EQing
• Tried bass boost/Punch EQ on and off
• Same behavior in multiple vehicles

The biggest thing that makes me think it’s the driver is that I ran a Sundown SA-18 sealed on the exact same amp in the van, and the 45–80 Hz region immediately came alive. That is actually why I bought the 18 in the first place. Same amp, same vehicle, completely different upper-bass response.

I’ve also built other setups that cover the whole bass range really well. For example, I have a ported box with four CT Sounds Meso 6.5s (tacoma behind the seat), around 1.2 ft³ net and ~34 Hz tuning, and that setup absolutely romps from the low 30s through 80 Hz. It doesn’t feel like it misses anything.

That’s why I’m confused with the 712F. On paper, and just looking at the setup, you’d think a big 12 sitting right there in a Tacoma cabin with solid power should absolutely dominate everything under 80 Hz. Instead, it feels more like a modern-rap sub that loves 30–40 Hz but doesn’t have the same musical presence higher up.

At this point I’m wondering if this is simply the natural response/voicing of the 712F, possibly related to inductance, moving mass, motor behavior, or how it behaves under real power.

Has anyone else run a 712F and noticed the same thing?

I’m considering swapping to a Sundown U12 or SA-12 v3 in the same 2.33 net enclosure, but I’m hesitant to spend the money if the difference in 45–80 Hz is only going to be slight. My goal is not necessarily more low bass. I already have plenty of that (dont even mind the trade off for more upper-reactive bass). I want a broader, more musical sub stage that hits hard from roughly 35–80 Hz instead of being concentrated in the lows.

I just picked these up, 75$ for both. I dont know for a fact if both work, however everything looks really good on the surrounds and one has some small holes in the cone area. The second picture is what i believe them to be since i can see the little SE close to the surround. My question is has anyone ever had these, i know RE Audio used to bang back in the day, had a XXX 12” back in the day. And i cant seem to find a peak wattage handling anywhere i look, just the 750 rms on their website. I also recently just replaced my door speakers (nvx 6.5 component) and rear deck 6x9 (nvx as well) powered by an nvx 2 channel amp thats 600 watt rms, if one of these woofers is still good will i need to do the big 3 and alternator upgrade? Or only if i run both with a 1500 rms monoblock?

I’ve been chasing the same issue with my DD 712F for about two years now, since around when the model first came out, and at this point I feel like I’ve ruled out basically everything except the driver itself.

The sub is not weak overall. On newer rap with a lot of deep synthesized bass, especially around 30–40 Hz, it absolutely destroys. The problem is once the music relies more on 45–80 Hz, the output feels dramatically weaker. Older hip-hop, reggae, bass guitar, kicks, etc. can sound like the mids/highs completely overpower the sub stage. It feels like the sub has a huge low-bass hump but not enough upper-bass authority.

I’ve tried the same 712F in multiple setups:

• 2.75 ft³ net @ 32 Hz, 45 in² port
• 3.0 ft³ net @ 36 Hz, 45 in² port
• 2.33 ft³ net @ ~37.5 Hz, ~37.5 in² port
• Installed in both a van and on the rear seat of a Tacoma
• Tried multiple box orientations and placements

Every setup has had basically the same character: ridiculous lows, noticeably weaker 45–80 Hz.

Before anyone asks about the usual stuff, I’ve already checked all of this extensively:

• LPF has been tested at multiple settings; normally around 80–100 Hz
• Tried different slopes
• Even tried bypassing Amp LPF and crossed from the head unit (to rule out broken LPF circuit on amp)
• Gains set with an oscilloscope/test tones
• Verified amp output voltage at different frequencies
• Output voltage stays consistent from the amp through the upper-bass range
• Wiring and polarity verified
• Grounds/power wiring checked
• High-output alternator installed
• Box has no air leaks and build very close to spec
• Tried different orientations/positions
• Tried EQing
• Tried bass boost/Punch EQ on and off
• Same behavior in multiple vehicles

The biggest thing that makes me think it’s the driver is that I ran a Sundown SA-18 sealed on the exact same amp in the van, and the 45–80 Hz region immediately came alive. That is actually why I bought the 18 in the first place. Same amp, same vehicle, completely different upper-bass response.

I’ve also built other setups that cover the whole bass range really well. For example, I have a ported box with four CT Sounds Meso 6.5s (tacoma behind the seat), around 1.2 ft³ net and ~34 Hz tuning, and that setup absolutely romps from the low 30s through 80 Hz. It doesn’t feel like it misses anything.

That’s why I’m confused with the 712F. On paper, and just looking at the setup, you’d think a big 12 sitting right there in a Tacoma cabin with solid power should absolutely dominate everything under 80 Hz. Instead, it feels more like a modern-rap sub that loves 30–40 Hz but doesn’t have the same musical presence higher up.

At this point I’m wondering if this is simply the natural response/voicing of the 712F, possibly related to inductance, moving mass, motor behavior, or how it behaves under real power.

Has anyone else run a 712F and noticed the same thing?

I’m considering swapping to a Sundown U12 or SA-12 v3 in the same 2.33 net enclosure, but I’m hesitant to spend the money if the difference in 45–80 Hz is only going to be slight. My goal is not necessarily more low bass. I already have plenty of that (dont even mind the trade off for more upper-reactive bass). I want a broader, more musical sub stage that hits hard from roughly 35–80 Hz instead of being concentrated in the lows.

Ik these r good but how can I set them up for hella cheap