The Platform 2 Series is a very well-rounded daily usage subwoofer. This subwoofer offers the utmost in sound quality, while also being able to handle large amounts of power. It is our best all-around Platform to build from, and is at home in pure SQ applications and also in high SPL street pounder systems. If you are looking for the best all-around performer, for a modest price, this is the subwoofer to get.
The Platform 2 retains the same mounting depth of our smaller Platform 1 Series, while power handling and output are both increased tremendously.
Power Handling Ratings: Standard RMS Power Handling – 1500 watts W/ Optional Hi Performance Addition- 1800 watts Peak Power Handling – 3000 watts SPL Burp Power – 4000 watts
Standard version features include: Dual stacked 7.5″ x 1″ Y35 ceramic slugs Chrome top and bottom plates FEA optimized motor assembly 12 spoke aluminum cast frame – Black Chrome push terminals or 8ga XP-Flex CCA Direct Connect Wiring Extended length aluminum flatwound voice coil Dual 1 and Dual 2 ohm standard impedances Single 8″ stiff progressive roll poly-cotton spider Sewn 3mm heavy duty leadwire Kevlar impregnated pulp cone body 1.5″ wide roll rubberized foam surround
They are manufactured to the strictest standard, and guaranteed to last. Hand built in the USA!
Our subwoofers are available in two different performance configurations, Standard and High Performance. The High Performance option will modify the parts used to build the subwoofer to increase the overall power handling and output capability.
The following upgrades would be applied to the subwoofer if the High Performance option is selected: Power handling increase from 1500 Watts to 1800 Watts RMS Extended length aluminum flatwound voice coil Dual stiff spider suspension Dual stitched heavy gauge leadwires
T/S Parameters for Platform 2 18″: Revc = 3.90 ohms Fs = 26.41 Hz Zmax = 39.01 Qes = 0.66 Qms = 6.55 Qts = 0.60 Le = 3.75 mH Sd = 1230 cm^2 Vas = 8.02 ft^3 / 227.09 L BL = 17.60 Mms = 345.59 g Cms = 105.13 Sensitivity = 89.7 dB @1W/1m Sensitivity = 93.2 dB @2.83Vrms/1m Xmax = 56mm total Usable Excursion = 3.5″ total
This product may also be used in Infinite Baffle and Bandpass applications. Please contact us before purchasing this product for these installations to make sure that the standard parts will be compatible with your enclosure.
If you would like to customize this series of subwoofer with performance or cosmetic options that are not available in our online store, please submit a Custom Subwoofer Request.
Physical Specifications for Platform 2 18″: Rated Diameter 18″ / 460 mm Overall Diameter 18.5″ / 470 mm Bolt Hole Circle 17.375″” / 441mm Cutout Diameter 16.75″ / 425mm Mounting Depth 9″ / 228 mm Magnet Diameter 7.5″ / 191 mm Driver Displacement 0.18 ft.³ / 5.09 L Shipping Weight 45 lb / 20.4 kg
We offer connections to the subwoofer either via spring loaded terminals or direct connect wiring.
Push Terminals are chrome plated, and are marked with a red and black colors to designate the positive and negative terminals. They offer the simplest installation and provide a nice secure connection.
Standard Push Terminals are made to accept a single 8ga wire and use a tab soldered directly to the push pin, to which the leadwires from the voice coil are soldered.
LARGE Push Terminals are made to accept a single 4ga or dual 8ga wires and use a heavy duty, extra-thick tab bolted to the push pin, to which the leadwires from the voice coil are soldered.
Direct Connect wiring offers the very best connection directly from your amplifiers output wiring to the voice coil of your subwoofer. Our direct connect wiring is securely attached to our interwoven braided lead wire via high temperature solder, then covered with heavy duty heat shrink. You can make your connection to the wiring via the twist and tape method, large wire nuts, crimp connectors, or solder.
XS-Flex is the best of the best! A 100% Pure Oxygen Free Tinned Copper wire, with 735 Strand Count and Soft Touch PVC Casing. XS Flex Cable is True AWG cable. The high strand count and soft touch cable jacket allows the wire to be super flexible and easy to use in any installation. XS-Flex is available in BLUE and CLEAR.
XP Flex Cable is also a True AWG cable. It is made up of 10% Oxygen Free Copper(OFC) 90% Copper Clad Aluminum(CCA), with 735 Strand Count and Soft Touch PVC Casing. XP-Flex is available in BLUE, RED and BLACK.
PSI Flex Cable is made to the same exact standards as XP Flex, but is available in PINK only.
10 reviews for 18″ Platform 2
Rated 5 out of 5
Richard (verified owner)–
This review is a little premature because I haven’t got to hear them yet. I haven’t built my box yet but these platform 2 18’s look and feel very impressive. As soon as I get my box built and put them to the test I will give another review. But I’m sure there going to be awesome.
Rated 5 out of 5
David –
Bought these woofers a few months back now and I come from products like the ssa line and dss and Fi. I say that because this woofer has outperformed in quality and performance anything that I have purchased through the other guys. I am a shop/installer and have had my hands on just about every company out there and I am the most impressed with psi. From start to finish this whole experience was handled very professionally with great conversation prompt shipping and strong packaging. The woofers arrived with great protection and no damage. I bought 4 of the platform 2 HP 18s with direct leads. These are some of the best woofers I’ve spent my money on. Thanks for the great product. Look forward to my upgrade to platform 5!
Rated 5 out of 5
Tyler Bailey –
PSI platform 2 18s did wonderful in my fourth order bandpass and took a little over rms like champs! Great sounding speakers that performed very well in both ported and 4th order enclosures. 10/10 would reccomend to anyone!
Rated 5 out of 5
Andrew roman –
Let me start with this I bought these awhile back.. ordered the wrong ohms and the psi team helped me right away, their costumer service is phenomenal! Next I put 2 of these subs in a box tuned to 35 hertz and I was hitting a 145.5 on only 800 watts in a Ford expedition, so you can see the potential in these subs. Unfortunately I had to get rid of them because of money reasons but you definitely will see me running 2 15 inch platform 5s in the next month’s, TEAM psi
Rated 5 out of 5
woo_user_2436905 (verified owner)–
For the money quality and rms they beat every company that you can think of i would know because i searched high and low and you have the option to customize your sub and make it yours there’s nothing like it i brought a platform 2 and i have it in a massive box tuned to 32hz only on 1000 watts ..big amp coming soon she slams and it cracked the windshield in my isuzu rodeo lol thanks psi.
Rated 5 out of 5
Austen –
This is an incredible sub. The power range is good for a budget and the different options for customizing it is great! The way they pack and ship the subwoofer is great solid and safe. This sub can definitely take a beating and I reccomend this sub to anyone on a budget or even not on a budget. This was the first sub I bought from PSI and It made me want to keep buying from them.
Rated 5 out of 5
Tyler –
Favorite subs I have owned to date. Incredible low end response sounding great in both a ported or 4th order enclosure 🤙
Rated 5 out of 5
Christopher Willey –
I haven’t even purchased an item yet… However these guys have to be the best value subwoofers around. I have been seriously craving an spl build, and have been comparing subs across many high end retailers. It can be a really long process depending on how big you want to go, or how much you can spend. These guys have to be the best price to performance car audio manufacturers I’ve found. Hopefully softening the blow to my bank account once my build is finalized. I can’t wait to spend some bills here. You will definitely see a future comment upon purchasing their car audio gold!
Rated 5 out of 5
Dan (verified owner)–
I wanted an affordable 18 that took a little power and slammed. What I got was much much more. The sub was ment for my home theater to replace a sound integrity ht 18 and wow! It blows the sundown based product away. I run sundown u series 15s in my tahoe well I stuck it in my truck and as I figured it kept up with both of them in a box that wasnt really for the mobile audio use. Sub digs super deep. The bass response is ridiculous. I prob could have got away with a platform 1 but the platform 2+ is a beast. Hate to use that word but its sooo true!! The build time took a minute but well worth the wait. I’m considering a pair of platform 3 15s now for my tahoe.
Rated 5 out of 5
Jake –
I have 3 of these with the 1800 watt upgrade, On a Sundown SFB 8k, so impressed I’m looking at doing a serious PSI build…… Already doing serious hair trick….. Some 10k’s and level 5s in the near future…….
Richard (verified owner) –
This review is a little premature because I haven’t got to hear them yet. I haven’t built my box yet but these platform 2 18’s look and feel very impressive. As soon as I get my box built and put them to the test I will give another review. But I’m sure there going to be awesome.
David –
Bought these woofers a few months back now and I come from products like the ssa line and dss and Fi. I say that because this woofer has outperformed in quality and performance anything that I have purchased through the other guys. I am a shop/installer and have had my hands on just about every company out there and I am the most impressed with psi. From start to finish this whole experience was handled very professionally with great conversation prompt shipping and strong packaging. The woofers arrived with great protection and no damage. I bought 4 of the platform 2 HP 18s with direct leads. These are some of the best woofers I’ve spent my money on. Thanks for the great product. Look forward to my upgrade to platform 5!
Tyler Bailey –
PSI platform 2 18s did wonderful in my fourth order bandpass and took a little over rms like champs! Great sounding speakers that performed very well in both ported and 4th order enclosures. 10/10 would reccomend to anyone!
Andrew roman –
Let me start with this I bought these awhile back.. ordered the wrong ohms and the psi team helped me right away, their costumer service is phenomenal! Next I put 2 of these subs in a box tuned to 35 hertz and I was hitting a 145.5 on only 800 watts in a Ford expedition, so you can see the potential in these subs. Unfortunately I had to get rid of them because of money reasons but you definitely will see me running 2 15 inch platform 5s in the next month’s, TEAM psi
woo_user_2436905 (verified owner) –
For the money quality and rms they beat every company that you can think of i would know because i searched high and low and you have the option to customize your sub and make it yours there’s nothing like it i brought a platform 2 and i have it in a massive box tuned to 32hz only on 1000 watts ..big amp coming soon she slams and it cracked the windshield in my isuzu rodeo lol thanks psi.
Austen –
This is an incredible sub. The power range is good for a budget and the different options for customizing it is great! The way they pack and ship the subwoofer is great solid and safe. This sub can definitely take a beating and I reccomend this sub to anyone on a budget or even not on a budget. This was the first sub I bought from PSI and It made me want to keep buying from them.
Tyler –
Favorite subs I have owned to date. Incredible low end response sounding great in both a ported or 4th order enclosure 🤙
Christopher Willey –
I haven’t even purchased an item yet… However these guys have to be the best value subwoofers around. I have been seriously craving an spl build, and have been comparing subs across many high end retailers. It can be a really long process depending on how big you want to go, or how much you can spend. These guys have to be the best price to performance car audio manufacturers I’ve found. Hopefully softening the blow to my bank account once my build is finalized. I can’t wait to spend some bills here. You will definitely see a future comment upon purchasing their car audio gold!
Dan (verified owner) –
I wanted an affordable 18 that took a little power and slammed. What I got was much much more. The sub was ment for my home theater to replace a sound integrity ht 18 and wow! It blows the sundown based product away. I run sundown u series 15s in my tahoe well I stuck it in my truck and as I figured it kept up with both of them in a box that wasnt really for the mobile audio use. Sub digs super deep. The bass response is ridiculous. I prob could have got away with a platform 1 but the platform 2+ is a beast. Hate to use that word but its sooo true!! The build time took a minute but well worth the wait. I’m considering a pair of platform 3 15s now for my tahoe.
Jake –
I have 3 of these with the 1800 watt upgrade, On a Sundown SFB 8k, so impressed I’m looking at doing a serious PSI build…… Already doing serious hair trick….. Some 10k’s and level 5s in the near future…….