vented or sealed cabinet?

I believe it can be used either way.

will these fit in pioneer cs g403 16 in woofer spot?

Since this speaker is a inch smaller in diameter than yours and if you can't find a 16" speaker you'll probably have to fabricate a plastic, metal, or wooden ring with a 15" opening and the outermost diameter fitting in the recessed opening or perhaps 17" in diameter to allow you to screw or glue it on top of the opening of your speaker cabinet.

what is the hole to hole mounting diameter? thank you

The measurement from the center of the hole diagonally to the center of the hole is 14.5"

is this a suitable woofer for a bass guitar amplifier?

I replaced the woofer in my Leslie 723 organ speaker. It plays with a Hammond Colonnade organ and the bass sounds very good. A guitar, however, may not be suitable for a four ohm speaker.

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Goldwood GW-15PC-8 15" Heavy Duty Woofer 8 Ohm

Goldwood GW-15PC-8 15" Heavy Duty Woofer 8 Ohm

Product ID: 744809863

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Details

Brand
Goldwood Sound
Speaker Maximum Output Power
550 Watts
Frequency Response
2.1E+3 Hz
Connectivity Technology
Raw Wire
Audio Output Mode
Surround

🎯95dB SPL precision output

🔊550W max power punch

🛠️4-layer aluminum voice coil durability

Description

🎵 Feel the Power, Own the Room with Goldwood GW-15PC-8!

BUILT TO LAST - Heavy-duty 4-layer aluminum voice coil and 75oz magnet engineered for relentless pro use.
POWERHOUSE PERFORMANCE - Unleash up to 550 watts max for deep, room-shaking bass that commands attention.
PRECISION SOUND CLARITY - 95dB sensitivity ensures your beats hit crisp and clear, every single time.
VERSATILE PRO GRADE FIT - Fits standard 13.75" enclosures with a sleek die-cast aluminum frame for seamless integration.
AMERICAN ENGINEERED EXCELLENCE - Designed and crafted in the USA, trusted by DJs, live sound pros, and audiophiles alike.

The Goldwood GW-15PC-8 is a professional-grade 15" subwoofer delivering 275W RMS and 550W max power with a robust 8-ohm impedance. Featuring a 4-layer aluminum voice coil, 75oz magnet, and poly-mica cone with rubber surround, it offers precise 95dB SPL sound clarity across a wide 25-2100Hz frequency range. Built with a die-cast aluminum frame and designed in the USA, this woofer is ideal for pro DJ, PA, karaoke, live sound, and studio applications.

Specifications

Mounting Type	Flush Mount
Material	Aluminum
Model Name	Heavy Duty 8ohm 15" Woofer 550 Watts Replacement Speaker
Speaker Type	Woofer
Special Feature	Subwoofer
Recommended Uses For Product	Pro DJ speakers, pro PA speakers, pro karaoke speakers, live sound speakers, fixed installation speakers, studio monitors and home audio speakers
Compatible Devices	Smartphone, Tablet, MP3 Player, Desktop, Television, Projector, Laptop
Subwoofer Diameter	15 Inches
Net Quantity	1.0 count
Controller Type	Voice Control
Surround Sound Channel Configuration	1.0
Colour	Black
Included Components	woofer
Product Dimensions	38.9D x 38.9W x 16.8H Centimeters
Impedance	8 Ohm
Is Waterproof	False
Maximum Range	30 metres
Brand Name	Goldwood Sound, Inc.
Colour Name	Black
Vehicle Speaker Size	15 inch
Item model number	GW-15PC-8
Manufacturer	Goldwood Sound, Inc.
Item Weight	6 kg 760 g