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Description
fender twin reverb pedal Shift Line Twin MkIIISTax & Duty Free Fast Free Shipping Free Returns $489 is your absolute final total here for the Shift Line Twin MkIIIS, and its power supply is included. The Shift Line Twin MkIIIS is the 3rd version of this tube guitar preamplifier and cab simulator, which boasts a unique sound, universal connectivity, all in a compact black enclosure and design. The dynamic range has been expanded to achieve maximum gain. As a result, it can go from its renowned
Tax & Duty Free - Fast Free Shipping - Free Returns...
$489 is your absolute final/total here for the Shift Line Twin MkIIIS, and its power supply is included.
The Shift Line Twin MkIIIS is the 3rd version of this tube guitar preamplifier and cab simulator, which boasts a unique sound, universal connectivity, all in a compact black enclosure and design. The dynamic range has been expanded to achieve maximum gain. As a result, it can go from its renowned clean sound, into crunch and overdrive without external boosting. The Twin has an analog bypass circuit for the digital IR cab sim, and can be 100% analog when the cab sim is not engaged.
The Shift Line Twin cabinet simulation (cab sim) is based on the Impulse Response (IR) convolution technology, which provides a realistic and detailed sound, while preserving the character of the power amp, cabinet, and microphone used to record the impulse.
The Twin comes with two impulses recorded from the Fender Twin combo amplifier. The microSD card slot allows users to upload their own cabinet impulses.
DEMO VIDEO:
Check out the awesome detailed demo video on this page in the photos section, many thanks to guitar and effects wizard Brett Kingman.
CONNECTIONS:
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IN is the signal source input.
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THRU is a buffered output for the unprocessed signal split from the IN jack.
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SEND/RETURN is a series effects loop for external processing. The SEND out can also be used as an additional output.
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OUT is the main output designed to connect the preamplifier to a power amplifier (RETURN or POWER AMP IN on combo amplifiers, INPUT on power amplifiers).
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AUX IN is an external audio input (the signal from the AUX IN is only heard through the PHONES output).
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PHONES is a headphones output.
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BALANCED OUT is a balanced output.
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POWER IN is a power supply input. Shift Line's U.S. compatible power supply is included. The power requirements are 12V DC 650mA.
- MICRO SD is a microSD card slot.
Our customers at Reverb gave Shift Line Twin 5 star reviews:
CONTROLS:
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GAIN controls input signal amplification. It can go from a crystal-clear sound all the way to a classic California-style overdrive.
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BASS, MIDDLE, & TREBLE KNOBS constitute a classic 3-band passive EQ with a mild frequency correction effect.
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MASTER controls the volume of the signal coming from the OUT jack.
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VOLUME controls the volume of the signal coming from the PHONES and BALANCED OUT jacks. The MASTER and VOLUME knobs work independently.
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TOP SWITCH controls the signal’s high frequency harmonic content. The “+” position accentuates the highs and the attack. The ”-” position provides a milder sound by cutting the high frequencies. The neutral position does not affect the signal in any way.
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GND SWITCH allows to override “ground loops” that can negatively affect the signal when using XLR connections. In the lower position of the switch, the preamp’s “ground” is connected to the signal receiver’s “ground”. In the middle position, the “grounds” are disconnected. In the upper position, the “grounds” are connected and an additional filter is used to remove interference. The optimal setting of the GND switch is selected by ear: there should be a minimum amount of 50Hz hum and interference.
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CAB SWITCH selects one of the two built-in cabinet impulses recorded from a Fender Twin combo amplifier with two JBL D120F speakers:
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“A” position selects the impulse recorded by a LOMO 19A19 microphone placed 15cm away from the edge of the speaker’s protective cap.
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Middle Position, cabinet simulation is disengaged.
- “B” Position selects the impulse recorded by a Sennheiser e609 microphone placed 25cm away from the center of the speaker.
When using a microSD card, impulses are loaded from the corresponding folder on the card. The CAB switch affects the signal from the BALANCED OUT and the PHONES OUT but does not affect the signal from the main OUT. -
“A” position selects the impulse recorded by a LOMO 19A19 microphone placed 15cm away from the edge of the speaker’s protective cap.
LOADING IMPULSES: Using a microSD card
- Before using a microSD card, make sure it is formatted to the FAT32 filesystem.
- When the memory card is used for the first time, a “Shift_IR” folder is automatically created on it. The folder contains two more folders (“A” and “B”, corresponding to the CAB switch positions) in which the default impulses are stored. To use external impulses, replace the default ones with your own files. The supported impulse format is 24bit 48kHZ WAVE PCM1, uncompressed.
- To restore the default impulse files, insert a blank microSD card into the device. This will create a “Shift_IR” folder containing the default files. If no card is inserted, the built-in impulses are used.
USER MANUAL DOWNLOAD:
Shift Line Twin MkIIIS Manual PDF
SPECIFICATIONS:
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Tube type: 12AX7
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Memory card type: microSD
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IR latency: 1.2ms
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IN: 6.3mm, mono, unbalanced, -20dB, 1MOhm input impedance
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THRU: 6.3mm, mono, unbalanced, -20dB, 1kOhm output impedance
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SEND: 6.3mm, mono, unbalanced, -10dB, 1kOhm output impedance
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RETURN: 6.3mm, mono, unbalanced, -10dB, 1MOhm input impedance
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OUT: 6.3mm, mono, unbalanced, +20dB, 1kOhm output impedance
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BALANCED OUT: XLR, mono, balanced, +10dB, 1kOhm output impedance
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AUX: 3.5mm, stereo, unbalanced, 0dB, 10kOhm input impedance
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PHONES: 3.5mm, stereo, unbalanced, +10dB, 10Ohm output impedance
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POWER SUPPLY: Shift Line's U.S. compatible power supply is included. 12V DC 650mA, negative tip, 2.1/5.5mm diameter. Phantom power of the balanced line (+48V) or battery power are insufficient for the preamp to operate on. If phantom power is turned on, it will not damage the device. Use the included power supply, or a regulated power supply only.
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Dimensions: (LxWxH) 122x102x55mm (4.8x4x2.2”)
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Unit Weight: 480g (1.06lb)
- Power Supply Weight: 120g (0.26lb)
INCLUDED IN THE BOX:
- Shift Line Twin MkIIIS
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Power Supply: 12V DC 1000mA with 4 changeable plugs (U.S. compatible plug is included)
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User Manual
WARRANTY:
Comes with Shift Line's 3 year warranty for all electronic components, and 1 year for components subject to mechanical impact (potentiometers, footswitches, switches, jacks).
SHIPPING:
Ships fast! Usually same day, with Free UPS Shipping in U.S. with tracking (1 biz day processing, 1-3 biz days transit time usually). 1 and 2-Day guaranteed shipping is also available.
Our added value, when purchased here at coolguitarshop.us:
-
Best Total Price: $489 is your absolute final/total here, with Shopify Secure Checkout.
- Tax & Duty Free!
- Fast Free Shipping in U.S.
- No Risk: Try it on your own rig for 30 days. Don't love it? Return it for a full refund... no hassles, no costs. (We'll send you a prepaid return label link.)
- Rock-solid customer service, 365 days a year.
Get that warm, tube-based preamp tone, along with the Fender Twin combo amp cabinet simulation, with the Shift Line Twin MkIIIS.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 22 reviews
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Product Reviews
★★★★★ 2
Good for already soft mattresses, 1in thickness.
Color: Dark Grey, Size: Queen
If your mattress is already soft, it will help. It's less than 1in thick after tumbling for 40 minutes. It did fit my queen bed and felt somewhat soft when laying down but it didn't help much as far as comfort. Quality wise it looks good, not cheap and while my sleep quality wasn't improved, it might help someone with a better mattress than mine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 1, 2026
★★★★★ 5
Must have for mattress comfort and protection
Color: Green, Size: Twin, Color: Green, Size: Twin
I ordered the BDEUS Twin mattress topper for a temporary mattress. The topper definitely improves comfort and regulates temperature much better than just the mattress and sheets. The cover fits deep mattress easily fitting over my 13” mattress and could easily fit a much deeper bed. The padding is thick enough to provide some additional support. This model also has a thin sheet of waterproof material to help protect your mattress against spills or liquid damage. This layer is cover by the pillow top and does not seem to make much if any noticeable noise. Overall this is a high quality cover and mattress protector in one. At <$45 at the time of this review it provides an incredible value.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 28, 2026
★★★★★ 5
Topper
Color: Green, Size: Twin
I recently purchased the BDEUS Twin Mattress Topper Viscose Derived from Bamboo, and I am thoroughly impressed with my experience.
The comfort level is absolutely a 5 out of 5. The viscose bamboo material feels soft and plush, making my bed significantly more comfortable to sleep on. I wake up feeling well-rested and supported, which has been a noticeable improvement from before.
Here are some of the main pros and cons:
Pros: Incredible comfort and softness, high-quality materials, fits the twin mattress perfectly, and helps with temperature regulation throughout the night.
Cons: Name
Overall, I give the BDEUS Twin Mattress Topper a solid 5 out of 5 stars. It has completely transformed my sleeping experience, and I would highly recommend it to anyone looking to enhance the comfort of their bed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
★★★★★ 5
Adds comfort and support
Color: Green, Size: Twin
I’ve been using this bamboo mattress topper for a couple of weeks now, and it completely changed the feel of my bed. My mattress was starting to feel too firm and uncomfortable, especially on my lower back and shoulders, but this topper added the perfect amount of cushioning without making the bed feel overly soft or saggy.
The cooling effect was one of the biggest surprises. I tend to sleep hot and usually wake up sweating during the night, but the bamboo-derived fabric feels breathable and much cooler than regular mattress pads I’ve owned before. It stays comfortable throughout the night and doesn’t trap heat like memory foam toppers sometimes do.
I also really appreciate the waterproof protection. It gives peace of mind without feeling stiff or making that annoying crinkling noise some waterproof covers have. The surface still feels soft, plush, and smooth. It honestly feels more like a hotel-style pillow top than a basic mattress pad.
The thickness is just right for pressure relief. It helped reduce the soreness I usually wake up with in my back, and I’ve been sleeping much more comfortably overall. The deep pockets also held securely on my twin mattress and didn’t slide around, even after moving a lot during sleep.
Another thing I liked was how fluffy and well-made it looked right out of the package. After letting it expand for a bit, it became nicely plush and evenly padded. The stitching seems durable, and it still looks great after washing.
If you’re looking for a softer, cooler sleeping surface with added waterproof protection and better support for aches and pains, this mattress topper is definitely worth it. It made my bed feel newer and far more comfortable without needing to buy a whole new mattress.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
★★★★★ 5
BDEUS Twin Mattress Topper, So Soft
Color: Green, Size: Twin, Color: Green, Size: Twin
Having purchased BDEUS products in the past, I was very looking forward to ordering the mattress topper made of viscose (a material derived from bamboo) just to see (and feel) the benefits of the material.
My concern about the material, viscose derived from bamboo, is that the process to manufacture the material can be chemically intensive leading to harsh smells. I can say the topper has no off-putting smells. The quality of the manufacturing is present as there are no loose threads/seams, the material has no defects, and the print is uniform. The use of the material also leads to increased durability while enhancing the topper’s breathability and cooling properties.
The topper is fitted meaning the topper will not come off the mattress very easily (even though you may need sheet straps if you are a wild sleeper). But the softness is wild, I mean this has to be one of the softest materials I have felt, and it feels very luxurious. Waterproofing and moisture-wicking is also a benefit as small spills are not absorbed into the fabric.
The topper is also very thick and plush, and while the product listing touts “Back Pain Relief” it may be too soft depending on how firm, or soft, you prefer your mattress. I have to say this is definitely a five-star offering from BDEUS. This topper is for my daughter but I’m going to order a queen-sized topper for my bed as the price is just right.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
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