Question 1

What's the difference between this model and the wl model that's $150 more?  i can find no info on yamaha website on what wl mean, etc; thanks!

Accepted Answer

The difference is the $150 more wireless version has a rechargeable battery so you can run the THR-II without a power cable for a few hours (maybe up to 8 on a good day I believe).
Additionally you can buy the Line 6 G10 Relay bug. The THR-II Wireless version for $150 has part of this system built in. So you just need the bug that plugs into your guitar. There is no additional part needed to plug into the THR-II Wireless as it's built into the $150 more wireless version since Line 6 and Yamaha are now sort of the same company. Also the bug can be charged by plugging it into the THR-II wireless when not in use.

The $299 non-wireless version does not have the built in battery for use without connection to power, and does not have the Line 6 Relay built into it's input.

Line 6 does sell a G10 Wireless system with the bug + the adapter the plugs into an amp/pedal board. Those are around $150-$250 for the G10/G10S depending on when/where you buy it from as sometimes they are on sale for $30-$50 off.

Question 2

Do you need to use line 6 transmitter, or can you use any bluetooth transmitter?

Accepted Answer

The previous answer saying it is only works with Line 6 transmitters is partially incorrect. You can use any transmitter but you will need a full pair (transmitter and receiver) bypassing one that's built-in. I've been using wireless system Boss WL-20 with no issues and I guess the other similar system will work just fine. I already had Boos wireless and that was exact reason I decided to go with cheaper THR-10II version because I could add my own wireless capabilities and I did not need the built-in battery for autonomous functions.

Question 3

Would this do well as an acoustic amp, as well as an electric?

Accepted Answer

This amp has acoustic modeling but they make an acoustic specific model. Here is the link to that one: 
https://www.amazon.com/dp/B08K387BBJ/ref=cm_sw_r_cp_apa_fabc_.w54FbTR8N85J

Question 4

What's the total power of this amp?

Accepted Answer

It's 5 watts for each 3" speaker, 10 total.  It is not 20

ASIN	B07XNL8127
Amplifier Type	Solid State
Audio Output Mode	Stereo
Best Sellers Rank	#2,673 in Musical Instruments ( See Top 100 in Musical Instruments ) #60 in Combo Guitar Amplifiers
Brand	Yamaha
Color	Standard
Compatible Devices	Guitar
Connector Type	USB
Customer Reviews	4.7 4.7 out of 5 stars (441)
Enclosure Material	Stainless Steel
Global Trade Identification Number	00889025123884
Item Dimensions D x W x H	5.5"D x 14.49"W x 7.2"H
Item Type Name	Wired Desktop Guitar Amp With 15 Guitar Amps and 8 Effects, Bluetooth-Enabled, Standard Color
Item Weight	3 Kilograms
Manufacturer	Yamaha
Mfr Part Number	THR10II
Model Name	THR10II
Model Number	THR10II
Number of Bands	3
Output Channel Quantity	1
Output Wattage	20 Watts
Power Source	Corded Electric
Speaker Size	3.1 Inches
UPC	889025123884
Unit Count	1.0 Count
Warranty Description	1 year manufacturer warranty yamaha corporation of america (yamaha) is proud of the experience and craftsmanship that goes into every product we represent. Yamaha sells its products through a network of authorized yamaha retailers. Only these authorized retailers are equipped with sales and service support materials and training that are not readily available to non-authorized retailers. The yamah…

THR10II

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