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  • Overnight Sensation Overnight Sensation

Overnight Sensations

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Quick Overview

One of the best selling DIY speakers ever.

* This kit ships for free *


Availability: In stock


The Overnight Sensations are likely one of the best selling DIY speakers of all time.  The small size is deceiving because they're able to fill an average size room with plenty of volume and good bass response.  These speakers also make great computer or bedroom speakers.

From the speaker designer: The Overnight Sensations were designed to be a quick, economical build that could put out a surprisingly-big sound in a small box. Could be a weekender project for an addict, a gift for a teenager, or--in my case--a set of small, full-bodied monitors that I could listen to while I graded papers. The bass these little HiVi drivers can put out is tremendous.  They throw out a very large soundstage and can actually fill a medium-sized room very well.  I originally built these to sit on my desk, but since they have very full bass, they sounded best put up on a little stand or risor.  Once I did that, I absolutely fell in love with listening to them in the nearfield.  They image very well not only from left to right, but also in front of, and far behind the speakers.


Product Highlights:

  • Baltic birch cabinet included with the kit.
  • Soft dome tweeter for smooth highs.
  • 4" aluminum cone woofer.
  • High quality crossover parts.
  • Surprising amount of bass.






Minimum order is 2 speakers: If you ordered one in the past and need one for a center, please contact me. Kits are sold as full kits, sorry no substitutions or subtractions. Don't forget binding posts, terminal cups, or speaker spikes if you need them because they can be shipped for free with any kit or flat pack purchase.

Shipping Note: Most speaker kits currently ship for free, but flat packs normally do not.  We try to get your order packaged and shipped in 5-8 days depending on how many orders have come in.  Please read the 'Frequently Asked Questions' section for more information.

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Speaker Kit Information


  Model:      The Overnight Sensation
  Designer:      Paul Carmody
  Frequency Response:      45hz - 20khz (+/-3db)
  Power Range:      5 - 35 watts
  Sensitivity:      83db - 2.83v/1m
  Impedance:      8 Ohm
  Tweeter:      Dayton ND20FA
  Midrange:      N/A
  Woofer:      4" HiVi B4N
  Enclosure Type:      Ported
  Dimensions:      6" W x 9" H x 8.5" D
  Kit weight:      About 7 pounds
  Assembled weight:      About 7 pounds

Price Break Down:

1 - 4" HiVi B4n woofer: $14.91
1 - Dayton Audio ND20FA-6: $14.82
1 - Denovo CNC cut flat pack: $13.70
1 - Set of crossover parts: $23.31
1 - Speaker port: $2.57
1 - Set of screws:  $.50

Packaging Material: $1.50

Paypal Fee: $1.98

Retail Cost: $73.29

Discount Cost: $66.93 with free shipping

Please read the 'About Us' section for more information on pricing structure and quality parts used.

Specific Overnight Sensation Assembly Notes:

It is recommended that you lightly fill the speaker cabinet with polyfill without blocking the port. The tweeter is a push in style tweeter, so it's a tight fit and will need to be pushed in pretty hard. That's the way they were designed to mount. If your tweeter seems like it just won't fit, check for any excess glue or plastic on the tweeter mount which can keep it from getting started in the hole. Once it's started, push a little on the top, then on the bottom. Back and forth until it's all the way in. Note the reverse polarity when wiring up the tweeter. Paul has a lot of information and the crossover schematic posted on his site.  Click here to read all of that information. 

I recommend gluing up the box and leaving the front baffle off until the last step. Before gluing the front panel on, you might want to install the port.  Before gluing the telescopic port together, check to see if it's wide end will fit through the cutout okay. Sometimes the plastic can be just a little bigger from the manufacturer.  It will be tight no matter what, but as long as you can fit both sides of the telescopic section of the port through the hole, then you can glue it at 6" and install it later.  If the plastic port seems a bit too big, you can either sand it a little bit or attach the outer portion of the port to the box and then glue the telescopic portion inside so that the total length of the port is about 6" long. It doesn't have to be 100% perfect, just close. Then go ahead and glue on the front panel. That paragraph sounds a bit harder than it actually is.  Please be sure to read the general tips below before starting your build.


Recommended Tools and Supplies:

  • Quality wood glue like TiteBond.
  • At least 2 clamps 6" wide or bigger.  You can use masking tape to hold the panels together if needed.
  • Soldering Iron and solder unless there is an optional assembled crossover for your kit.
  • Wire cutters
  • Screwdriver
  • Drill to predrill all screw holes.
  • Sanding block or power sander.
  • About 2' of speaker wire to connect your woofers and tweeter to the crossover board.


General Tips:

    Crossover Assembly: 

  • VERY IMPORTANT - Inductors are the parts that look like small rolls of copper wire. Notice that the two ends of wire are silver and have been 'tinned' with solder. Those are the parts of the inductor that you should be soldering to, so don't cut it off to get to the copper colored portion.  Inductors should not be installed directly next to each other on your board.
  • None of the crossover parts have a positive or negative side so it doesn't matter which way they are facing when you assemble your crossover. 16-18 gauge wire is thick enough to use for your crossover or to go from your crossover board to the woofer or tweeter.
  • Your crossover can be assembled on a thin piece of MDF or pegboard if the kit doesn't come with a circuit board.
  • It doesn't matter where you put the crossover inside your speaker.  You could mount it on the outside if you wanted to.  
  • Normally you wire red wires to positive and black wires to negative.  If (and only if) your crossover schemtaic has a note saying 'Inverted Polarity', that means you need to connect the negative from the crossover to the positive on the tweeter and positive from the crossover to the negative on the tweeter.  This is only done on some tweeters, not woofers.
  • Click Here for a good assembly video by Matt Grant.


     Screws and Gaskets:

  • Predrill all screw holes with a bit that's slightly smaller than your screws to prevent the wood from splitting.  Most screws are #8 panhead and you can use a 7/64" or 1/8" drill bit.  Overnight Sensations use a #6 panhead so you can use a 3/32" bit.
  • VERY IMPORTANT:  Protect your woofer or tweeter when installing screws because you don't want the screwdriver to slip and puncture one of your components....that will ruin your day!  Consider putting your free hand next to the screw to cover up the edge of the woofer or tweeter.
  • If your kit comes with gasket tape, it should be applied to the back of the waveguide. Peel the paper off the back to expose the sticky side and slowly work it around the perimeter on the back side of the part.  Some woofers will need gasket tape as well.


     Stuffing or Lining the Speaker Cabinet:

  • If your speaker or subwoofer is a sealed cabinet, most designers recommend that you lightly fill the inside with polyfill (pillow stuffing).  If you don't have polyfill, then you can line the walls with 1" - 1.5" thick light weight open cell foam (like acoustic foam) or fiberglass insulation.  You can also use 2-3" recyled denim insulation that can be bought at Home Depot.
  • It's okay to cover up your crossover with the polyfill, insulation, or foam.
  • If you're using a ported enclosure you should lightly fill the cabinet with polyfill and be sure not to block the ports.  If you do not have polyfill then line the walls with 1" - 1.5" thick open cell foam (like acoustic foam), 2" - 3" of denim insulation, or 2" - 3" thick poly batting.
  • Some of the speaker designers like to lines the walls of their ported enclosures with a 1" - 1.5" acoustic foam, and then lightly fill the remainder of the cabinet with polyfill.  If this is a required method, it will be listed at the top of the page under 'Assembly Notes'.


Links to Build Threads for this Speaker:

Frequently Asked Questions:

* What length do the ports need to be?  Answer:  The designer recommends them glued at 6" long.

* Does this kit come with a circuit board to assemble the crossover on?  Answer:  No, most people assemble them on a small thin piece of wood.

* Do I need to use a subwoofer with these?  Answer:  For music, these can be run without a subwoofer.

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