Adding a subwoofer, in a very different way - Page 3 - Kia Niro Forum
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post #21 of 63 (permalink) Old 02-15-2019, 01:58 PM Thread Starter
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More progress today!


Total times the front seat has been unbolted to date; 4


Got the right side of the box done. So now the next panels to make are the front and rear panels. Once those two are completed then the rest of the box will go together pretty quickly.

The biggest accomplishment today was the removal of the underseat metal bracket. Got my air saw out and it was off in no time. Got the wires tucked up a little higher now too. To see how much room is under the seat now, I stood my cordless drill up under the seat while the seat was bolted down!! So now there is 9” of clearance under the seat!! I could mount a forward facing 8” sub in there if I wanted to. Hmmmm..........

Naw, I’ll stick with a top firing 10” sub.
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post #22 of 63 (permalink) Old 02-15-2019, 05:02 PM
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That is a big bracket! I'd like to remove mine too just for more storage clearance under the seat. Are you removing the air vent too?

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post #23 of 63 (permalink) Old 02-15-2019, 05:53 PM
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I think i would grind the sharp pointy bits back a little as they are likely to cut someone if they put their hands in unexpected.

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post #24 of 63 (permalink) Old 02-15-2019, 10:15 PM Thread Starter
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The air vent has been removed under the driver seat. All you need to do to remove it is grab on to it, and give it a sharp yank towards the back of the car. There isn’t any hardware holding them in place.



As for the sharp bits, I agree 100%. They do need to be ground down to not only prevent cuts, but also to prevent the air bag wire harness from getting damaged. I have already rerouted the harness to give more clearance but it needs more work.
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post #25 of 63 (permalink) Old 02-20-2019, 09:31 AM Thread Starter
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The weather has been miserable around here so no progress has been made, but 2 orders have been placed for parts. The subwoofer should be here later today and an order was placed this morning for a new fuse box cover. It’s purpose in this setup will be revealed at a later time.
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post #26 of 63 (permalink) Old 02-20-2019, 10:30 AM Thread Starter
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Amplifier.


This, much like the subwoofer, is an area where lots of research was done. Much like the subwoofer, there were requirements in an amplifier. Those requirements are as follows;

1. At least 2 ohm stable.

2. A minimum of 300 watts RMS of true power, not just rated power.

3. Small physical size. The amp MUST be able to fit completely under the passenger seat with room to spare, and preferably be slim enough that the under seat HVAC vent can stay in place.

4. Low amp draw. Even though it appears as though the electrical system on the Niro can handle 50+ amps of current, I want to limit this to only 30 amps. This means the amp needs to be a Class D type.


So after an exhaustive search, one amp stood above the rest. What worried me is the brand of this amplifier. Power Acoustic. They are not known for making quality equipment.

More searching revealed this amp being tested on an amp dyno. This tests the true power output, not just what a manufacturer says what the power will be. So this little amp produced about 450 watts at 4 ohms and about 650 watts at 2 ohms. More than enough.

Then I discovered another very nice tidbit about this amp. It is made in Korea! So why does this matter? Typically, amps made it Korea have better quality control and are made with better components compared to cheap made in China amps.


The model of the amp is RZ1-2300D. The last nice surprise is this amp can be bought from any local WalMart for $97. It has speaker level inputs which will be used, and it also has a remote level bass knob that will also be used.
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post #27 of 63 (permalink) Old 02-20-2019, 03:09 PM Thread Starter
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Total times the front seat has been unbolted to date; 6

Wait, I skipped 5. Well, today I unbolted the drivers seat twice while doing measurements.


So today was just a day to take measurements for the box. The weather was great, but I must limit outdoor activities and time on my feet due to an allergy test tomorrow. So now that I have measurements of what the box needs to be, I can work on the box in days to come without the need to remove the driver seat. So even when the weather is bad, progress should be made.

Another nice update is the missing tools have been found!!!!! My counter sink bit, pneumatic brad nailer, and my electrical storage boxes have been found! So progress should come quickly, once I can get time to work on it. As of right now, it appears as though either Friday or Tuesday will be my next available time that progress can be made.
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post #28 of 63 (permalink) Old 02-22-2019, 01:18 PM Thread Starter
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Total times the front seat has been unbolted to date; 6



More progress!!! It is a chilly 50 degrees outside with intermittent light rain. So just plain nasty! Inside my garage though it is a comfortable and dry 60 degrees thanks to my small Little Buddy propane heater.


Got the front and back panels drawn out, cut out, and installed. The brad nailer and clamps are really speeding up the build process.

The subwoofer also came in right on time. The suspension on it seems to be very stiff. This should loosen up after the subwoofer is broken in. The temptation is there to wire up my 2k watt car audio amp to four 100 amp/hr AGM batteries, set the gain REALLY low to put out about 100 watts, and play a 25 to 35 hz note out of the sub for about 30 minutes to help expedite the break in process.


Tuesday should be a day when I can get more progress done. Only time will tell. By the end of next week, I should be at the point of doing a test fit of the sub. Then comes the really dirty part. Sanding. Lots and lots of sanding.
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Last edited by 91cavgt; 02-22-2019 at 01:20 PM.
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post #29 of 63 (permalink) Old 02-27-2019, 07:27 PM Thread Starter
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Total times the front seat has been unbolted to date; 6


Got a little more done today. No pics but got 2 more panels cut out and attached. There are only 3 more panels that need to be cut out and installed! Once that is done then the beautification of the box will start. I picked up a belt sander today. It will be used to quickly even out all of the edges so the painting process can start.

Still got a lot to do, but it is starting to take shape!
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post #30 of 63 (permalink) Old 02-28-2019, 08:57 AM
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Originally Posted by 91cavgt View Post
Total times the front seat has been unbolted to date; 6


Got a little more done today. No pics but got 2 more panels cut out and attached. There are only 3 more panels that need to be cut out and installed! Once that is done then the beautification of the box will start. I picked up a belt sander today. It will be used to quickly even out all of the edges so the painting process can start.

Still got a lot to do, but it is starting to take shape!
how much bass extension to you expect from your subwoofer?

From what to what? E.g. 40Hz to 30Hz?

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