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When you do get that high-excursion driver, some overhead chicken wire should do the trick :D

Thanks for the replies guys. I've decided to use the inbuilt decoder of the player and the old M504 will be used to power 1 or possibly 2 DIY subwoofers. Best regards :) Isaac

Hi, We recently bought an ONKYO TX-SR701 receiver and a Pioneer DV-667As for my dad who has a pair of BOSE 901VI. Dad would like to use the 901s as the front surround channels, unfortunately the speaker's active EQ is proving to be a challenge to insert between the signal path. At the...

That 100W figure is the thermal rating of the voice-coil. It really takes little power to mechanically-overload a subwoofer; especially at low frequencies; and especially using pure sinusoidal signals. hth :) Isaac

Hi, General Circuit Simulators: SpeakerWorkshop is not entirely user-friendly, but it's free. Crossover Simulator isn't entirely finished, but it's functional and free. Classic Filter Simulator: Jeff B's Passive Crossover Design Calculator is a free, Microsoft Excel-based...

Here you go David :) Subwoofer Simulator Unibox winISD Pro SpeakerWorkshop Some more freeware programs from the FRD Group site. Regards, Isaac

An Adire Audio Shiva Mk-III in a 142-liter/18Hz vented-box is really something to be heard and experienced; especially when compared to 'car subwoofers.' Its bass reproduction just seems effortless and especially undistorted. Ordering one and shipping it to the Philippines may seem a bit too...

Xmax is pretty low and Fs is relatively higher compared to most "home" drivers. How much is this driver unit? I'd recommend an Adire Audio Shiva instead, which has more Xmax, better bass extension given only a (smaller) 142.5-litre vented-box @ 16Hz-18Hz and it'll play louder too. The authorized...

Try the software and information found at the FRD Group site as well :)

Peter, did you get a chance to look at that AES Preprint about flared ports? If not, you might be interested to know that the same text was re-released last year, so you no longer have to pay for the preprint just to study the article (that is if your local library has a JAES subscription). Here...

Dan, it's always been a habbit of mine to only round down the final answer (to the smallest significant digits among the factors used; 3 in this case) :D

Dan, you could put student (which is what I put), hobbyist or DIYer in the Company edit box, that's fine. Tobey, I bet that'll make a nice pair of multimedia speakers -- better than stock plastic computer speakers. Those Peerless tweeters aren't shielded, are they? Here's an 8-ch amp based on...

No, Brian is right. 1.0ft^3 = 28.3 liters There are 12*2.54 cms/foot. 30.48^3 equals 28316.846592 cubic centimeters or 28.3 liters. :)

Tobey, Rod's projects only come with inexpensive circuit boards, nothing else. So you can use the stuff you already have at hand. The Gainclone is another minimalist amp. It's so simple, everything could be wired up point to point. Dan, National Semiconductor offers free samples of their...

Nice, simple and neat setup! I bet those speakers sound just as good as they look :emoji_thumbsup:

Consider using other chips. I'd imagine it would be cheaper too since chips like the LM3886 and LM3875 are available as free samples. All you'll need are a few caps and resistors and a ready-made circuit board from, perhaps, The Audio Pages (specifically this project pictured below)...

3V of allowance is just a rule of thumb. You'd see in op-amp datasheets what the maximum output voltage swing is before it clips. For most op-amps, the maximum is 2V to 3V away from the supply rails (unless otherwise specified).

Generally, input/output signals should be 3V (or more) clear off the op-amp's supply rails. So if you're sure your input/output amplitudes are well below 12V, you could use a lower supply voltage(s) (keeping in mind the minimum 3V allowance and the particular op-amp's needs). But if you were...

If the noise is there even at low volumes, then the driver could be faulty -- the voice-coil might be rubbing against the pole piece. Or... Examin your receiver/player's sub out. I found my SONY DVP-S336's subout to have scratching, grainy, noise along with the bass signal. I knew it was...

The C12 (CS2246) woofer might be more efficient, but it is severely limited by its Xmax. The 12XL (CS2272) can play ~6dB louder thanks to its higher Xmax. (An excursion/power-limited graph should verify this). A net enclosure volume of 0.1m^3 tuned to 22Hz should be fine for either subwoofer...

Recall that Unibox states frequency response with pure sinusoidal signals. With normal music, especially complex music, the available power from your amp would be spread across the power spectrum (of the input signal), so extra amp headroom won't hurt :) Cheers, Isaac

Did you base your values on textbook equations? Filter design must be based on actual SPL and impedance measurements of the drivers in their enclosures. I wouldn't recommend you go through the trial and error process of tweaking the component values, especially since this is for an electronics...

The option for a PR box would be in winISD's project wizard. The PR options for Unibox are near the bottom on the Speaker Design tab. Try Subwoofer Simulator as well :) hth, Isaac

A rumble filter or subsonic filter is otherwise known as a high-pass filter. The most common ones are based on the Sallen-Key or Multiple Feedback topology. Usually, a 4th-order HP filter is enough, even a 2nd-order one will do. Have a look at the Projects section of The Audio Pages hth :)

We Were Soldiers is another subwoofer demo DVD :)

Try the Y.Aksan's Room Response Calculator. It can calculate the in-room response of two subwoofers at the same time. hth :) Isaac

The test version of the new winISD Pro was recently announced and made available for download. The updates include filters, equalizers etc. You might want to try it out :) Cheers, Isaac

Brian, I think that is only true for the passive filters of Unibox :) Don't quote me on this Greg, but I think Unibox uses the Benson-Thiele-Small model to simulate subwoofers. Yes, it's accurate, but only to about 300Hz or so (or within the pistonic range of the driver). Beyond that, more...