Monoprice Monolith 16 THX Ultra vs JTR Speakers Growler (2015)

Short answer: both are discontinued, so this only matters if you are buying used. Used, the JTR Speakers Growler (2015) is the better pick: it ranks #13 of 143 subwoofers by sound quality (rated 4.5/5), against #19 (rated 4.4/5) for the Monoprice Monolith 16 THX Ultra. If you want one new, the JTR Speakers Captivator 215PRO ranks #7 at $3,500.

The case for the Monoprice Monolith 16 THX Ultra: A THX Ultra certified 16 inch ported subwoofer with huge output for far less money than most rivals, now worth finding used. Watch for: Heavy at 172 lbs (78 kg) and ported design can interact with room acoustics.

The case for the JTR Speakers Growler (2015): A 12 inch ported subwoofer with output close to far bigger flagships, a strong used pick now that it is discontinued. The catch: Ported design room interaction, 99.2 lbs (45 kg) size, and $2995 cost.

Buy the JTR Speakers Growler (2015) only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, start with the JTR Speakers Captivator 215PRO instead.

Looking for alternatives? See the complete Subwoofers rankings.

Prices on this page were last checked October 29, 2026 at 4:42 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.

As an eBay Partner, we may be compensated if you make a purchase.

Specifications Side By Side

Related Speaker Comparisons

More worthwhile head-to-heads for JTR Speakers Growler (2015):

• JTR Speakers Growler (2015) vs WW Speaker Cabinets X21 - B&C 21DS115-4
• JTR Speakers Growler (2015) vs Pro Audio Technology LFC-24sm
• JTR Speakers Captivator S2 vs JTR Speakers Growler (2015)
• JTR Speakers Growler (2015) vs Funk Audio Ultra 24.0
• Danley Sound Labs DTS10 vs JTR Speakers Growler (2015)