Quick answer
Choose the 4-ohm PRO-84XA when your amplifier is stable at 4 ohms and you want the simplest wiring for a single 8-inch mid-bass. Choose the 8-ohm PRO-88XA when your amp needs a higher-impedance load or you are wiring multiple mid-bass speakers in parallel.
The shared 275W RMS rating makes impedance the real decision
The PRO-84XA and PRO-88XA both carry a 275W RMS rating and the same 8-inch frame size, so you are not choosing between a weaker and a stronger speaker. You are choosing how much load the speaker presents to your amplifier and how that load behaves when you add more speakers.
That matters because amplifier output changes with impedance. A 4-ohm load draws more current than an 8-ohm load from the same channel, while two 8-ohm speakers in parallel present a 4-ohm load. Your amplifier's published impedance range and channel count should drive the decision, not a guess about which number sounds louder.
When the 4-ohm version saves wiring work
A single PRO-84XA on a 4-ohm-stable channel is the straightforward path for a front-stage build with one mid-bass per side. You avoid series wiring and keep each speaker on its own channel, which makes level adjustment and troubleshooting simpler.
The trade-off is that 4 ohms leaves less room for parallel expansion. If you later add a second mid-bass to the same channel in parallel, the load drops to 2 ohms, and not every amplifier is rated for that.
When the 8-ohm version gives you more wiring options
The PRO-88XA is the flexible choice for multi-speaker arrays. Two 8-ohm mid-bass speakers in parallel present a 4-ohm load, which matches many 4-ohm-stable amplifiers while spreading the output across two drivers. Four 8-ohm speakers in a series-parallel arrangement return to 8 ohms, useful when you want to keep the load high on a larger array.
The trade-off is that a single 8-ohm speaker on a channel rated for 4 ohms will typically draw less power than a 4-ohm model would. If your goal is maximum output from one driver per channel, the 4-ohm version is the more direct match.
Where the 6.5-inch impedance question fits
Shoppers comparing 6.5-inch mid-bass speakers often ask about impedance in the same breath, but the XA 10th Anniversary mid-bass models covered here are 8-inch drivers. If your build is sized around a 6.5-inch cutout, these 8-inch speakers are not a drop-in substitute regardless of impedance. Confirm the cutout diameter and mounting depth before comparing ohm ratings across sizes.
Decision rules for picking your XA mid-bass impedance
- One mid-bass per amplifier channel: If your amplifier is rated for 4-ohm loads and you plan one 8-inch mid-bass per channel, pick the 4-ohm PRO-84XA. It matches the channel without extra wiring.
- Two mid-bass speakers on one channel: If you want two 8-inch mid-bass speakers on a single 4-ohm-stable channel, pick two 8-ohm PRO-88XA units and wire them in parallel. Two 8-ohm loads in parallel equal 4 ohms. Check that your amplifier's 4-ohm rating is per channel, not bridged.
- Amplifier limited to 8 ohms: If your amplifier specifies an 8-ohm minimum load, use the 8-ohm PRO-88XA. A 4-ohm speaker on that channel would present a load below the amplifier's rating.
- Planning to expand later: If you may add mid-bass speakers to the same channel in the future, start with 8-ohm units. They give you a parallel path to 4 ohms instead of dropping a 4-ohm pair to 2 ohms.
- Matching left and right: Use the same impedance model on both sides of the vehicle. Mixing a 4-ohm and an 8-ohm mid-bass across channels creates uneven loading and level differences.
Product facts at a glance
- 10th Anniversary Edition 8" Mid-Bass Loudspeaker 275 Watts Rms 4-Ohm: 10th Anniversary Edition 8-inch mid-bass loudspeaker rated 275W RMS at 4 ohms (550W max). A single unit presents a 4-ohm load, so it pairs directly with amplifiers rated for 4-ohm channels without series wiring.
10th Anniversary Edition 8" Mid-Bass Loudspeaker 275 Watts Rms 4-Ohm - 10th Anniversary Edition 8" Mid-Bass Loudspeaker 275 Watts Rms 8-Ohm: 10th Anniversary Edition 8-inch mid-bass loudspeaker rated 275W RMS at 8 ohms (550W max). The higher impedance lets you parallel two units into a 4-ohm load or keep a single driver on an 8-ohm-stable channel.
10th Anniversary Edition 8" Mid-Bass Loudspeaker 275 Watts Rms 8-Ohm
Which build each version suits
Best for
- A single 8-inch mid-bass per door or kick panel on a 4-ohm-stable amplifier (PRO-84XA)
- Multi-speaker mid-bass arrays that need parallel wiring to reach a 4-ohm load (PRO-88XA)
- Builders who want to keep the load at 8 ohms on an 8-ohm-rated channel (PRO-88XA)
Not for
- 6.5-inch speaker cutouts, since these are 8-inch drivers
- Amplifiers that are not rated for the resulting load after wiring
- Mixing 4-ohm and 8-ohm versions on the same amplifier channels
