10" Car Subwoofer 1000W High Power Non-Press Paper Cone Dual 4 Ohm

Hello good morning, I need to know if it can be connected to 8 ohms, that is, the 2 coils in serial

Yes, connecting the coil in series makes it 8 Ohms

How well does this speaker work in a free air application?

It doesn't work well on Free air. it works best on ported box

Do these need crossovers, for just bass.

YES

What is the best enclosure size for the speaker

Here is a recommended box
https://www.amazon.com/Skar-Audio-AR1X10V-Universal-Subwoofer/dp/B084KMNWSQ/ref=sr_1_6?crid=1RIE1GZG5LIH6&dib=eyJ2IjoiMSJ9.ls200ZQz4_GyiefMw7P_4Xw0GItd-QGT5c44yNMRf6C-Nn-rWNhHy-PDZZD1kDY_kljxa8n9feAIDuVKNxtAfX462TjNOGcmi9wYagzeuADq2Qa--O96reDpVcVpvRal_vjQLvhjPFOSL665qF1sBXBjZCLOUGMJJC8kyPlZZ0HKriaoana-Q6zaCj993wX2glVpMjP0DSbE5QVNot5lIWOZS5a1IxNRh6F3xpgW0x-fEDwd2s-TET7YwduK62GDWwsTKA9kj8Tda4a22mc5AGLrPv8YIjJHCCecb23jLzw.etlTNpyv-_w8mZfqdJUEn33jhIpWM84mhzJV1Y2iZsE&dib_tag=se&keywords=10%22%2BSpeaker%2Bbox&qid=1730401694&s=electronics&sprefix=10%2Bspeaker%2Bbo%2Celectronics%2C271&sr=1-6&th=1

Hi I understand that the PLPW10D sub-woofer speaker is rated at 500 watts RMS. Could you please provide the following for the PLPW10D: 1. The frequency response 3. The resonant frequency Thank you.

This information are currently not available,

What are the dimensions needed for a ported box with this sub?

YOU CAN CHECK THIS OUT
https://www.amazon.com/Speaker-Enclosures-Single-Subwoofer-Enclosure/dp/B0BN9DR7VZ/ref=sr_1_5?crid=8XLS8N9FJP2R&dib=eyJ2IjoiMSJ9.CBVsk0jbCWODN-LL0m4HfeztNN0xV59IRE1mCIyZwULPes4bfyVbQFDpfVsiNdFtVxyMAKvtfzgCdRsDN2ym5Dt-IrDlFShuMBPa-XqArCl9EX3cL1Xre7hVPRcgI0K05NT4FkDTvEuvi8_L50UpEtqbvAqDZVVqZO1ogb0n52HmjpJmrveEphE4MglekBVGlYsae9UT9quVwvrw6THX7-d8J_tBnHSYVm82vcrXyEs.dBCYkp-ZrUqllv8zAz26j65L4DkhwH2GYp_HTsBok8g&dib_tag=se&keywords=ported%2B10%22%2Bbox%2Bsub&qid=1730859831&sprefix=ported%2B10%2Bbox%2Bsub%2Caps%2C310&sr=8-5&th=1

How do I tell what model woofer I have and when it was made?

The model should be seen at the back of te speaker

What amp from your site would you recommend for these subs?

https://pyleusa.com/products/inv259a

What is the difference between open air and ported. vented and unvented?

On Free air the speaker fit into tight spaces within your vehicle, making them a preferred choice for compact cars or trucks with limited trunk space.
On Sealed the sound is more compressed and tight sounding
Vented box. The port augments the system output at this frequency by providing additional surface area and air displacement, resulting in an extension of low-frequency response and increased SPL

Frequency response of plpw10d woofer

42Hz - 3kHz