656BC LEAP Design Special: 830656 and BC25SC06 2way

656BC LEAP Design Special: 830656 5.25" woofer and BC25SC06 1" textile dome tweeter 2-way

This package includes two woofers, two tweeters, and two fully assembled premium crossovers.

• Configuration: Peerless 830656 5.25" woofer and BC25SC06 1" textile dome tweeter 2-way
• Box Size: 0.2 cf3 sealed
• SPL: 88 dB
• Impedance: 8 ohm
• Frequency Response: 80Hz to 20kHz
• Nominal Power Rating: 60 watts

We have culled our Crossover Design Library for the most promising crossover simulations. We are putting these together as a package deal for folks who want to experiment. These designs were custom-generated by Madisound's very experienced engineer who sadly passed away in recent years, so this is sort of in his honor. (He did hundreds of designs over the years, so he knew what he was doing!)

This design features the Peerless 830656 and BC25SC06 in a 2-way configuration. 

You will notice bass output on the lower region of the woofer response is bumped up a bit. This is due to LEAP simulating frequencies below around 200 Hz in half space (this means the speaker is radiating just 180 degrees when measured, i.e. half a sphere). This results in a frequency response with higher output in the bass section sloping gently to the midrange/tweeter. This blends the drivers most naturally to our ears in our experience. The output of the loudspeaker after the crossover is applied is mostly the decibel level between 200Hz to 800Hz on your graph (lower midrange region). 

Notes: Crossover point about 2.2 kHz. Output in the 86-88 dB range. Two hi-pass caps including a large value 20mfd. Fair amount of tweeter padding. Impedance mostly 8 ohm.

Unless otherwise requested, for optimal parts spacing crossovers will be assembled on one 5.5" X 5.625" Matrix and one 5.5" x 3.75" 64B board per channel. These boards are tin plated copper on fiberglass. The 64B can take 0.25" solder tabs or quick connector receptacles, but the Matrix board has solder pads only. The crossovers will be fully assembled with SideWinder 16awg air core inductor and MDL cap in low pass and with XPP-400V caps on tweeter. Since the box is so small you might consider running them externally.

For this design, we recommend a sealed box of 0.2 cubic feet for F3 of 90Hz.

(You could also try vented box of 0.25 cubic with 1.5" diameter vent by 4" long for an F3 of 68Hz, with the Goldwood 1.5" x 4" vent for a roll off at 65 Hz, but this simulation was done for sealed box)









Frequency Response- individual: The graph above shows the output in SPL across the frequency range. The left-most line is the woofer and the right designates tweeter. The crossover "point" is at about 2.2 kHz.




Frequency Response- summed: The graph above shows the summed frequency response. Nominal output is in the mid to upper-80's dB region. Pretty efficient nominal 87 dB.




This graph shows the system impedance. Mostly 8 ohm across the midband. Should be a friendly impedance load to most amplifiers.

Basic Assembly Instructions

1. If using cabinets not pre-cut for your drivers, mark the enclosures for pilot holes and drill pilot holes.
2. Cut internal wires to appropriate lengths. Adjust according to the cable type you are using and solder wires to crossovers, observing polarity.
3. Install crossovers inside cabinet. We recommend a double stick tape to adhere to the cabinet base.
4. Solder input leads to terminal cup, observing polarity, and install terminal cups.
5. Cut and install desired insulation materials. Typically you would cut a slit in the foam, then pull the drivers' lead wires out through their respective driver holes.
6. Separate and fluff-out fill material such as Acousta-Stuf then place in cabinet, dispersing evenly throughout the main cavity and apply gasketing tape material to cutout holes if desired.
7. Solder wires to drivers, observing polarity.
8. Align drivers with pilot holes and secure with wood screws or desired fasteners. Tighten slowly and evenly.
9. Double-check polarity. If woofer polarity is incorrect, the loudspeaker will typically have weak or poor bass response. If tweeter polarity is incorrect, the system may have a dip in response in the midrange and sound odd.

Peerless SDS Line 830656 5.25" Woofer offers low resonant frequency performance, ideally suited for compact sealed enclosures. This 5.25 inch 8 ohm member of the SDS family features a coated paper cone with rubber surround, high power voice coil suspended in a ferrite magnet motor, and narrow profile steel basket shaped to fit into narrow cabinets.

Peerless BC25SC06-04 1" Textile Dome Tweeter features pre-coated textile diaphragm for improved consistency, neodymium magnet, and heat sink on magnet for increased power handling.

See more free designs in Madisound's Crossover Design Library!