The Merlin BAM Page

Technical Description

The Merlin BAM is a dedicated outboard module designed to optimize the low bass performance of the Merlin VSM. When implemented in a system with any VSM series loudspeaker, the BAM will deepen the bass response of the VSM by 10Hz without effecting the rest of the speaker’s exceptional sonic characteristics. The BAM does this by applying a carefully contoured boost (5.2dB) centered around 35Hz in conjunction with a built in subsonic filter below 28 Hz. The boost acts to extend the [flat] bass response of the speaker in an amplitude and phase correct manner to 4dB down at 30Hz. The BAM’s built in filter prevents subsonic energy from reaching the amplifier and the speaker. Now that the speaker is not required to reproduce this unwanted energy (at potentially high distortion levels), doppler and IM distortion artifacts are significantly reduced throughout the operating range of the speaker. Soundwise, this translates into a cleaner bass and mid-band performance which directly improves soundstage and imaging characteristics. The subsonic filter in the BAM will also act as the high pass filter for Merlin’s upcoming stereo subwoofer system.

The BAM is available in both single ended (RCA) and balanced (XLR) versions. The balanced BAM literally contains double the circuitry found in the single ended BAM. These circuits are connected in a fully differential manner for optimal balanced performance.

The Battery BAM

The BAM is now available in a battery powered version which includes a self contained rechargeable battery system. The battery BAM option allows you to operate the unit in a full AC, 50/50 AC/battery, or full battery modes. In the full battery mode, the last vestiges of AC related noise are removed to allow the speaker system to exhibit it’s maximum resolution. Fully charged batteries will allow the BAM to operate for up to 12 hours in full battery operation. Battery BAMs are available in both single ended and balanced versions.

BAM Connection and Operation

The BAM is a line level component and should be connected with high quality interconnects. We recommend that the BAM be connected between your preamp and amplifier (or in a tape loop) if you use multiple sources. We also recommended that the BAM be connected between your source component and preamp’s line level input for single source systems (i.e. a CD only system). You may insert the BAM in a tape loop for comparative purposes, this will allow you switch it in and out of the signal path. Due to the buffering provided by your preamp’s line stage, you may find that the sound is "juicier" when connected between your source and preamp. Others, will prefer the leaner and cleaner presentation when the BAM is connected between your preamp and power amplifier. Experiment for yourself and choose the setup you prefer.

Integrated amplifier based systems require that the BAM be connected to a tape loop when multiple sources are used. If there is only one line level source, the BAM can be connected between the source and the integrated amp.

To connect the BAM:

1. Connect the output of the preamp to the input on the BAM, connect the output of the BAM to the input of the amplifier. You can also use the BAM in the tape loop of your preamp or connect it to a source component (line level only) making sure to connect input to output as described.
2. Plug the BAM into a wall socket or line conditioner. The BAM has no on/off switch so that it is always powered when it is plugged in.

We strongly recommend that you use high quality interconnects for your BAM, preferably the same brand you use throughout the entire system. Contact Merlin for recommendations for brands of interconnects that work especially well with the BAM and your Merlin speakers.

AC Powered BAM Use & Operation:

Because the BAM was designed for continuous use, it should be plugged in at all times. This insures that it will deliver the best sound quality you can with no time needed for warm up. The BAM draws as much power as a typical night-light, the impact on your power bill will be negligible.

Battery BAM Use & Operation:

1. Full AC (Switch Down): In this mode your BAM is powered from the outboard AC power supply and the batteries will be charged at their fastest rate (approximately 24 hours to fully charge).
2. 50/50 (Switch Up – AC Power Supply Plugged In): In this mode your BAM is powered equally from the outboard AC power supply and the BAM’s batteries. In this mode the BAM’s batteries are slowly discharged.
3. Full Battery (Switch Up – AC Power Supply Unplugged): In this mode your BAM is fully powered from its’ internal batteries. Fully charged batteries will provide you with approximately 12 hours of operation.

Caring for Your BAM:

The BAM does not contain any user serviceable parts. The outer case is aluminum and has a black powder coat finish. Clean with a soft cloth or a paper towel lightly sprayed with a mild all purpose cleaner.

Precautions:

• Do not operate this or any other electrical device near water, including in the rain or in areas of high moisture (duh!). The BAM was designed for indoor use only.

• Do not obstruct airflow from the BAM’s outboard power supply, this could cause overheating.

Specifications

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Merlin Music Systems Inc.
4705 Main Street, PO Box 146
Hemlock, New York 14466
PH (585) 367-2390 FX (585) 367-2685
E-mail: info@merlinmusic.com
www.merlinmusic.com