MartinLogan Grotto 12
Couldn't load pickup availability
Free Shipping On All Orders, No Minimums.
We offer free 2-day shipping on most products within the continental US.
Weekdays - Orders placed by 2pm EST ship same day. Orders placed after 2pm EST will ship the following business day.
Weekends - Orders placed on Saturday and Sunday will ship Monday.
Orders requiring motor freight delivery may take more than two business days. Once your order has shipped, you'll receive a shipping confirmation email with a tracking number for easy tracking.
Orders that contain items that are currently backordered, special order, or out of stock will ship complete once all items are in-stock unless otherwise requested.
If you need it faster, you will have the option of choosing a quicker shipping option when you checkout on the website.
At this time, we do not ship internationally and orders to Hawaii and Alaska may incur an additional shipping charge. Please contact us at 888.899.8776 or email support@audioadvice.com to confirm.
Rerouting and Address Changes
We cannot make ANY address changes once an order is placed. If you are unable to accept delivery of your package as ordered, we will need to cancel your order, return the package to sender and have you replace your order through our website.
Keep the Box
We suggest you keep the shipping box or boxes for at least 30 days. It is actually a great idea to keep boxes for audio products for the life of the product. Having the box and all packing will increase the trade-in value should you decide to move up and they are handy to have should you ever need to send the unit in for repair.
How To Receive a Motor Freight Order
The trucking company will contact you to schedule a convenient time to deliver the order. Please note that you must be present for delivery.
Visually inspect the box to make sure you see no signs of damage. If you notice any damage at all, take some pictures with your phone and make a note of them on the delivery receipt the driver will ask you to sign. If it is obvious that the product is damaged, please refuse the order and contact us immediately at 888.899.8776 or email support@audioadvice.com.
Open your box as soon as possible and inspect the product for damage and contact us if you find anything wrong.
FedEx Freight Service Comparison
| Feature / Service | Scheduled Curbside Delivery | White Glove Delivery |
|---|---|---|
| Scheduled delivery appointment | ✔ | ✔ |
| Delivery location | Ground level only (garage, front door, loading dock) | Room of choice, any floor |
| Delivery team | 1 person | 2 people |
| Placement inside home/business | ✘ | ✔ |
| Upstairs / downstairs delivery | ✘ | ✔ |
| Unpacking | ✘ | ✔ (upon request) |
| Packaging removal | ✘ | ✔ (upon request) |
| Assembly / installation | ✘ | ✘ |
| Old item removal | ✘ | ✘ |
At Audio Advice, we pride ourselves on customer satisfaction. We'll bend over backward to make sure you're 100% satisfied and we won't accept anything less. We offer 30-day hassle-free returns and personalized service from real, live people.
If an item doesn't meet your expectations, you may return or exchange it in its original condition and packaging within 30 days for a full refund, minus shipping fees. Items shipped back in like new condition through standard shipping carriers will only incur a flat fee of $15 to return. If the items were initially shipped through free scheduled delivery via motor freight (commonly referred to as LTL), returning them will result in return shipping fees starting at $150. These items include but are not limited to, oversized items such as TVs, certain subwoofers, floorstanding speakers, furniture, and most items weighing over 75 pounds. Return fees will also apply for exchanges. We want to treat your system as if it is our own and want you to be completely satisfied with your purchase.
Please see the instructions below. We only accept returns for any product purchased directly from our website. If merchandise is not returned in its original condition or is missing packaging, manuals, accessories or other parts, or the resale value of the product has been impaired, a partial refund will be given and calculated on a case-by-case basis.
Non-Returnable Items
The following items cannot be returned or cancelled:
- Special/Custom Order Items
- Open Box Products
- Gift Cards
- In-ear headphones cannot be returned once the packaging has been opened due to personal hygiene reasons. Please contact our customer care team if you'd like help choosing.
-
Turntables With a Broken Stylus: All turntables ship out with the stylus intact. If you return a turntable or phono cartridge with a broken or missing stylus you will be subject to a return fee. Please be careful when setting up your turntable and contact us with any questions.
Is It Easy To Return An Item?
Yes, simply give us a call at 888.899.8776 or you can email our support team at support@audioadvice.com. Many times our team of experts can help figure out why the product might not be working like you expected and get things fixed over the phone, so don’t be surprised if we ask a few questions, we love troubleshooting!
If our tech help can not make you happy, we will email over a return shipping label with a Return Number.
Hopefully, you saved all of the original item’s box and packaging inserts. You will want to pack back up your return or exchange in the same way it came out of the original box. Once you have everything packaged correctly, tape the box on the top and bottom to assure it stays together. If Audio Advice shipped the item to you inside a second box, it's a good idea to use that same extra box to help prevent damage on its way back to us. To avoid it accidentally coming back to you, use a magic marker to cross out the old shipping label or just tear it off.
The return shipping label we send you will have our address on it, just make sure you take the box to the right shipper (UPS, FEDEX, or USPS) as per the label.
If you are close to one of our stores, please let us know if it is more convenient for you to return it to us directly. You will still need to get a return number by contacting us and shipping and/or restocking charges may apply.
When Will I See My Refund?
It usually takes around 7-14 days for the refund to show up on the payment method you used. We do inspect all returns for damage and accuracy of the item inside the box before issuing a refund. Some items may be subject to shipping and restocking fees.
Can I Exchange My Purchase For Something Different?
Sometimes those big speakers just don’t fit in the room or you might have bought a small subwoofer and later found out you’d love a bigger one. If you would like to make an exchange within 30 days of receiving your item, just give us a call at 888.899.8776 or email support@audioadvice.com and we will help work out the details. Additional shipping charges and return costs may apply.
How Do I Cancel An Order?
If the item has already shipped out or is a special order item, it is not possible to cancel the order. Please contact us at 888.899.8776 or email support@audioadvice.com to start the return process.
What If I Find Shipping Damage?
We need to know right away about any shipping damage. Please contact us at 888.899.8776 or email support@audioadvice.com within 48 hours of your delivery so we can get the ball rolling on making things right. It’s very helpful to take some pictures and email them to us if possible.
Can I Refuse A Shipment?
You can, but unless the item is damaged, shipping and restocking fees will be deducted from your refund. If your item arrives damaged and you are lucky enough to be there, snap some quick pics and refuse the order. Then contact us so we can get a replacement on the way.
What Happens If My Order Is Defective?
This is actually pretty rare, most consumer electronics work fine out of the box 99.9% of the time. We’d like for you to contact us first by calling 888.899.8776 or email support@audioadvice.com so we can help get to the bottom of things. If your item is indeed defective during the first 30 days, we can usually exchange it for a new, replacement unit.
What About Service After 30 Days?
Audio Advice has a great relationship with all of our brands and can help you with warranty service by the brand after our 30-day guarantee period. Even after the warranty expires, we can arrange for service by the brand on products purchased from Audio Advice. Just call 888.899.8776 or email support@audioadvice.com.
How Do You Determine A Restocking Fee?
You may not believe it, but sometimes we receive items back that were put in the box with zero packaging and are completely destroyed or are missing many of the pieces that came with the item. We also track serial numbers and will get back different serial numbers. We’ve even seen different items than what we shipped out be returned. However, it’s very important to package your return properly so that nothing goes missing or gets damaged in shipping, which will result in a restocking fee or even no refund at all. If a product is opened and the market value of the product is reduced, then a restocking fee may be applied to the cost of restocking and the reduced market value of the product. The bottom line is if you treat us fairly, we will do the same.
Audio Advice strives to provide industry-leading support and service while also maintaining the lowest prices available on products for our customers. We work hard with our vendors to bring our customers the best products at each price point. As a part of that process, we work with our vendors to provide the lowest pricing in our stores and on our website.
Our prices should always be the same as any other authorized dealer, including big-box retailers and major online retailers.
If you believe that you have found a lower advertised price from a legitimate authorized seller, call us and let us know so we can make sure we can correct any inadvertent error on our side. As a matter of policy, we update our prices automatically if a vendor changes its authorized pricing policies, so we generally have the best prices all the time. Increasingly, there are knock-off copies of products online, usually sold by non-authorized dealers.
Please be sure that the item meets the following conditions:
- The item is brand new, in stock, and available for purchase
- The item has the identical model number, color, etc as the item on our site.
- The seller is an authorized dealer
As always, our goal is to provide a terrific customer experience, including industry low prices. We appreciate your support.
Overview
High-Resolution Subwoofer System
Grotto series subwoofers offer a unique combination of understated, minimalist styling and impressively powerful, yet articulate performance. Utilizing MartinLogan’s largest, and most powerful Hybrid Woofer Systems to date, Grotto 12 and Grotto 15 pack an incredible feature list and massive power into a classy, room friendly design, making them an ideal choice for those looking for a high performance, high output subwoofer that won’t look out of place.
The Hybrid Woofer System used in the Grotto series pairs either a 12" or 15" active aluminum woofer with two equally sized, custom-designed aluminum passive radiators. This driver layout provides the massive surface area necessary to achieve the increased output and lower distortion of a ported design while maintaining the more compact sizing and tighter bass typically associated with a sealed design.
Powering the Hybrid Woofer System is the brawn of MartinLogan’s powerful Magnitude MT-2kW amplifier, capable of delivering up to 2000 watts of peak power (1000W RMS), and the brains of the Ultra High Resolution Vojtko DSP Engine, a best-in-class 500MHz DSP with 64bit processing. With their high output, low distortion Hybrid Woofer Systems paired with powerful and precise amplification and processing, Grotto series subwoofers have the ideal recipe for highly detailed and powerful bass performance even in larger rooms.
Hybrid Woofer System – The Ultimate Compact Powerhouse
Utilizing state-of-the-art Klippel analysis, all Grotto Series drivers are specially engineered for massive output capability and low distortion. Grotto 12 and Grotto 15 use MartinLogan's largest, most powerful Hybrid Woofer Systems, pairing either dual 12" or dual 15" passive radiators with a matching 12" or 15" active woofer. This driver layout delivers the best of both worlds; the increased output and lower distortion of a ported design, and the more compact sizing and tighter bass that sealed designs are known for. To ensure quick response, high output, and solid reliability, the active woofer is made of aluminum, known for its light weight, high strength, and excellent heat dissipation, all ideal qualities for such a high power application. MartinLogan's design team did not want to skimp on the quality of the passive radiators either. So even though they do not receive direct power, they too are made of aluminum to properly blend both acoustically and visually with the active driver.
Magnitude MT-2kW Amplifiers Redefine Grotto Performance
MartinLogan’s proprietary Magnitude Amplifiers unleash the full potential of the custom engineered Grotto woofers. The highly advanced Magnitude MT-2kW delivers up to 2000w Peak (1000w RMS) of low distortion power for concussive impact, and effortless musicality. This ultra efficient Class-D amplifier delivers massive power with incredible precision and control, driving Grotto 12 or Grotto 15 with nearly endless reserves of clean power even during the most demanding situations.
Advanced Vojtko DSP Engine: Elevating Subwoofer Performance
Just like their smaller siblings in the Abyss and Dynamo series, Grotto 12 and Grotto 15 subwoofers utilize the cutting-edge, ultra-high-resolution Vojtko DSP engine, named after MartinLogan’s Chief Audio Technologist. Featuring a best-in-class 500MHz DSP with 64-bit processing, the Vojtko DSP engine controls all aspects of subwoofer performance in real-time. This level of computing power enables advanced features like wireless app control, integrated wireless signal connection, and other advanced DSP functions with complete audible transparency, allowing MartinLogan engineers to fine-tune performance for maximum output and fidelity. Thanks to the computational power of this sophisticated DSP engine, Grotto subwoofers are also compatible with the award-winning Anthem Room Correction system.
Reduced Vibration, Enhanced Bass
Solid bass performance is a critical component of any audio system, and helps provide visceral impact to your entertainment. Both Grotto models feature integrated anti-vibration feet to improve bass performance by reducing floor and wall vibrations. By dramatically reducing the energy transfer between the subwoofer and the floor, unwanted room rattles and buzzes are removed, leaving tighter, cleaner bass and improved system clarity and dynamics. As a less intrusive alternative to acoustic room treatments, the integrated anti-vibration feet can also aid in minimizing noise complaints by reducing vibration transfer into adjoining rooms. Out of the box, these robust anti-vibration feet are safe for all flooring types, and optional carpet spikes are included to further improve performance on carpeted floors.
Fine-Tune Your Subwoofer Settings with MartinLogan's Intuitive App
By far the most convenient way to adjust a subwoofer, MartinLogan’s Subwoofer Control app for iOS and Android devices allows you to easily adjust settings such as Volume, DSP Mode, Phase, and many others right from the comfort of your seat for ultimate control and ease of tuning.
Optimize Bass Performance with Award-Winning Anthem Room Correction
Grotto subwoofers are compatible with the award-winning Anthem Room Correction system. This highly advanced software measures subwoofer performance in your room and then performs custom equalization, tuning, and calibration to achieve the highest levels of bass impact and accuracy possible for your specific installation. Requires an ARC Calibration Microphone and a PC or Mac computer (sold separately).
Details & Specs
| Model | MartinLogan Grotto 12 |
|---|---|
| Application | Subwoofer |
| Frequency Response | 22–120 Hz ±3 dB (Anechoic via LFE input) |
| Low Frequency Transducer | Triple 12" (30.5 cm) Hybrid Woofer System consisting of 1x high-excursion aluminum cone in a cast aluminum basket with 2x aluminum cone passive radiators for enhanced low frequency output |
| Amplifier | MartinLogan Magnitude MT-2kW Amplifier: 2000W peak (1000W continuous) |
| Digital Signal Processing | Ultra High-Resolution 500MHz Vojtko DSP Engine with 64-bit processing |
| Cabinet | Sealed 1" thick MDF cabinet with center brace and reinforced MDF woofer baffles |
| Controls (on backplate) | Level: Interactive LED Backlit Knob, Min–Max; Tone Sweep: Sweep Start and Pause (with status light); Power Mode: On, 12v Trigger, Auto; Wireless Audio Pairing Button |
| Controls (via Bluetooth) | Level: -40 to 12 dB; Low-Pass Filter: 35–120 Hz (1° increments); Phase: 0–180°; Preset Listening Modes: Movie, Music, Night; Anthem Room Correction (ARC Genesis): On/Off |
| Inputs | Line Level: Left, Right, and LFE; XLR: LFE; Speaker Level: Left and Right (requires banana plugs) |
| Wireless Input | Integrated Wireless Receiver; Wireless Transmitter Included |
| Outputs | RCA Sub Out (combines and repeats all incoming signals to an additional subwoofer) |
| Power Draw | Max: 1000W; Standby (Wireless Enabled): < 2W; Standby (Wireless Disabled): 0.5W |
| Feet | Integrated Anti-Vibration Feet (carpet spikes included) |
| Weight | 82.5 lbs (37.4 kg) |
| Dimensions (H × W × D) | 17.8" × 17.9" × 17.9" (45.2 × 45.4 × 45.4 cm) |
| Finish | Gloss Black |
