Peerless Tymphany 830880 5.25" passive radiator
I am selling them by the case of 18 @ $5.00 ea. for a total of $90.00 + $20.00 shipping to the lower 48 states.
These Tymphany passive radiators can offer you some fine bass in a loudspeaker used for a computer, Ipod, boombox, and etc. They would also be great for surround sound speakers. I love the smooth bass extension that the passive radiators give me. I have modified the B & O Redline 60 loudspeakers using these passives. My mains and subwoofers have a total of 12 - 15" passive radiators in their cabinets. The extra cost over the "honking and noisy" ports is well worth the money. Smaller cabinets can be built using the passive radiators. I have a link in the index dedicated to passive radiators. The passive radiator design extends the bass lower as well.
If you have a woofer or mid-woofer driver with a "Q" or QTS of .4 or less, you can take advantage of these passive radiators by reducing your cabinet size and having extended bass. Depending on the displacement and other parameters of your driver(s), one or several of them can get you some surprisingly great results! Get someone with good modeling software to run your driver parameters and my passive radiator numbers in their design program, and build your box according to the box tuning you desire. The specs of the 830880 passive radiators are in the buttons below. Tymphany recommends one of their active drivers and one of these passive radiators in a 5 liter box, but models have been run with some other drivers which work well in a smaller cabinet.
One size tire can fit many cars. The same is true with these passives. Use a couple of these passives with a driver of similar size and see how low and the high quality bass you can achieve without the port noises and honking. The rule of thumb is two times the amount of passives per driver. By having the passive radiators in your cabinet, your air space then becomes a suspension for your main driver, helping to keep it from bottoming out and reaching xmax or overdriving your woofer.
Peerless 830880
5.25" Passive Radiator with 6 mm Xmax, one
way.
Polymer coated paper cone with rubber surround.
Decorative stamped frame, truncated. Fs 23
Hz
These passive radiators already come with a factory gasket mounted to them to help you seal them to your cabinet's build.
The Superior Dynamic Sounds (SDS) Series
provides the
smallest but highest-quality subwoofers in the
industry today.
Leveraging the best in Danish craftsmanship, but
manufactured
to be very affordable, these audio transducers
are ideal for use in
small surround sound systems, but can also be
used in a wide
variety of end user products and applications.
Please click on the following links for full details of the specs of the passive radiators and the mounting dimensions:
I use these passive radiators in my redesign and modification of the Bang and Olufsen Redline 60 speakers, a very highly sought after vintage speaker due to their unique build and sound quality. My modification replaces the factory defective steel ABR plate's foam design and those who have modified them have reported lower and tighter bass than when they bought them new. I have plenty of the new passive radiators in stock. The gap in the steel plate and outer ring shown below is where the foam used to be.
Below are just a couple of examples with different types of drivers to show how the passive radiators can lower your box tuning frequency.
Here is a graph showing what a Pr will do with 2 A3’s(in red and without the PR’s in gray). This is a 5db boost from 75-100Hz!
A one foot outside dimension cube with 1 W6 driver and 3 of my PR’s all properly tuned now will do the following, see graph. (The zero point is 102db) That is 111db @ 22Hz for a stacked stereo pair near a rear wall. Audience's much bigger stacked cube 12” driver sub has slightly more output capabilities but only down to 25Hz. As you can see this small sub will go down to less than 22Hz, a 12% improvement! And all this without overdriving the drivers or the PR’s. This is some exciting stuff!
