Crescendo Audio


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MSRP: $2,249.99
— You save $1,050.00

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Crescendo BassClef BC-6k


As some enthusiasts have already heard through the grapevine, we are pleased to announce the new BassClef series.

The current Bass Clef series has had a hell of a run since 2011, but it is time to raise the bar once again with all good things.

The Crescendo Bass Clef models range from 4kw to 17kw. The first models to hit the market will be the BC-4k and BC-6k, followed by the BC-8kBC-13k, and BC-17k.


All new BC amplifiers utilize a newly tooled Crescendo heatsink and revamped circuit boards that stay true to our standards, with even higher power-per-square inch and resilience than before. This amplifier is Stable down to .5 ohm on sufficient electrical; this amplifier can also handle up to 19v.


Newly designed, custom tooled, proprietary Multi-piece Thermal optimized Heatsink with patent-pending interlocking slide-out CNC engraved top plate. 

This amplifier features a 2 stage copper anodized Top Plate that is easily removable for those who want to color match their show quality installations.

Silver-plated & hard-wired Tiffany RCA inputs 

Two sets of oversized 1/0 Power/Ground Inputs for efficient current transfer.

Dual 4 gauge Speaker output terminals! Which each terminal containing two outputs contains the same polarity for extreme ease of use! ( + + ) & (- -)


Overbuilt Power supply with heavy copper traces and Military spec PCB/heavy duty standoffs for extreme vibration resistance.

The BC series features a Handwound heavy-duty transformers & inductors to ensure no windings from excessive vibration.

They are manufactured using some of the highest quality and most reliable electrical components, with many 3% tolerance components. 


Full 4-Stage Intelligent Protection Circuitry 


1 Year/1ohm comprehensive warranty with 2 year

.5ohm optional extended warranty available.


Crescendo BassClef BC-6k POWER:

Power Ratings (clean power RMS @13.8v)

  • 1ohm: 6000w
  • 2ohm: 3000w
  • 4ohm:1750w

Certified Amp Dyno results (on electrical consisting of Mechman 370a alternator, 8 HPL75 AGM batteries, 3 runs of Crescendo 1/0 OFC cable runs Front to back)


  • .5ohm: 8210w @12.9v
  • 1ohm: 6554w @ 13.3v
  • 2ohm: 3729w @ 13.7v


Dimensions: 25 3/4" x 9 1/8" x 2 7/8"

(27" length from the tip of the terminal block to RCA tip)

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17 Reviews

  • 5

    Crescendo 6k.

    Posted by Jeramie on Dec 14, 2022

    I'm really impressed with this amplifier. Been running it at .7 Ohm for about 3 months now. This amplifier does not even get slightly warm. Nice amplifier and great service from D4S.

  • 5

    Crescendo bc6k

    Posted by Salvadore on May 22, 2022

    The Crescendo bc6k gets down. There is no complants here. Awesome support. Fast shipping. Couldn't ask for a better place to go threw for car audio.

  • 5

    This things a beast!

    Posted by Nicholas Musgrave on Mar 09, 2022

    I must say this is the nicest amp I have ever owned. I spent a little money on it. But you get what you pay for. The quality of this amp is amazing. And you can tweak it so much it's amazing . D4S was cheaper than anywhere and had it in stock. Thank you all

  • 5

    This things a beast!

    Posted by Nicholas Musgrave on Feb 25, 2022

    This amplifier is a monster. And down 4 sound made it happen! Super fast delivery. Packaged well and shipped fast. Thank you guys. I can't wait to get it all hooked up!!!

  • 5

    Crescendo bass clef 6k

    Posted by Rich Manalo on Sep 18, 2021

    Beefy amplifier and full of power.

  • 5

    This amp is Beasty

    Posted by Bradley Gardner on Jul 20, 2021

    I ended up swapping two taramps smart 3s for this crescendo and I must say it made a world of difference. Shipping was super fast and eventhough I didn't choose the option jp still signed it for me thanks jp. I'll never buy from another supplier I'm a fan for life. By the way my subs are 2 sundown x 12 v2s and I hit a 147 this past weekend.

  • 5


    Posted by Darryl Johnson on May 25, 2021


  • 5

    Excellent amplifier

    Posted by Gilberto Castellanos on May 13, 2021

    I love this amplifier the only thing I didn't get was my shirt, decals and the volt meter but besides that the amplifier is perfect thank you it was fast shipping love the service I would recommend this amplifier to anybody that loves big car audio big bass thank you again

  • 5

    Crescendo 6k

    Posted by Kamil Supinski on Mar 11, 2020

    Excellent service like always. Ton's up 5 starts for all,nothing to say. Great company. Recommended all way.Thanks

  • 5

    Excellent service as usual!!!!

    Posted by Chris Texeira on Feb 26, 2020

    I have ordered from jp he first started the company. That order was great. I didn't know much about cat audio and ordered a few things including a 16v battery for my car. Jp called me personally to give some advice and help me with correcting my order. This order I upgraded my amp and got it in 2 days from purchase. Thing is massive!!! Very very happy with the customer service and products from d4s. Thanks man.

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