The MartinLogan Dynamo 1500X is a small sealed alignment powered subwoofer utilizing a long throw 15â€ driver and an amplifier rated at 650 watts rms and 1300 watts short term. The Dynamo 1500X left a favorable sonic impression on me. I especially liked the small size, reasonable weight and uncluttered, basic connection and controls it provided. The 1500X performance was rock solid in that it never produced erroneous noises or distress, nor did it try to kill itself to produce what it could not. Despite is compact size and moderate price point, the MartinLogan Dynamo 1500X managed to meet the required output thresholds to receive the Audioholics Bassaholic Large Room rating. Discuss "MartinLogan Dynamo 1500X Subwoofer Review" here. Read the article.