Each 12" woofer is ported If you see a small box speaker with small woofers and ports then generally you can guess that it is for bass extension (often underdamped). If you see a very large box speaker with large woofer and large ports then it can be either bass extension (often underdamped) or for simple efficiency (may still be critically damped). In the case of very large box speakers the ports allow the designer to use a driver with an even more massive motor and magnet ( an electrically overdamped woofer, Qes) and place this in a ported enclosure to raise its Q or damping to be critically damped. (This is the typical design of what you see in studios with giant woofers and large 4 inch ports in very large cabinets - they are usually trying to get louder with a bigger motor woofer rather than deeper bass) |
Thanks to both of you,Marty and Shadorne.These are both very good explanations.I now understand what this means.My speakers have very impressive and efficient bass output.However,in order to see in what category they fit (over or under or just right),i first need to acoustically treat the room.There are just too many reflections.
My speakers are Silverline Sinfonia (18Hz-28kHz,96 dB).They have two 12" woofers and one 7" mid-woofer.Each 12" woofer is ported.I don't think these are "overdamped".I think they come closer to "underdamped" or "just right".
This is next for now,amps will come after that. |
Marty, Is correct. In fact the way the speaker mechanical and air suspension is designed is very important as to how it will sound. (actually far far more important than amplifier damping!!) Here is a third term: "critically damped". This has been generally accepted as the best sounding most practical approach. This is neither overdamped or underdamped - it means that when power is removed then the speaker goes to the rest position faster than any other design WITHOUT additional oscillations. Here is a link to Damping. The red curve is overdamped (like a screen door closing - uncommon in speakers - needs lots of force to make it move). The Blue curve is underdamped (quite common in speakers with a bass boost/hump). The Green curve is the "goldilocks" curve - critically damped or "just right" (often regarded as the optimum setup for a woofer) You may ask - Why then do speaker designers use anything else except "critical damping"? Basically it boils down to tweaking to get more output efficiency or more bass extension from small boxes - for example an underdamped driver with a port can get you more bass (higher efficiency) but the bass may sound muddy or warm (and won't be very smooth in freq response). Conversely, a critically damped sealed box design will sound tight and punchy in comparison but won't have anywhere near the bass extension and efficiency. An overdamped design will sound very tight but will be extremely inefficient - needs lots of power - high power Class D SS amps and Active designs may make this a more viable option in future. The above may explain why some ported small subwoofers with high bass efficiency may sound impressive but muddy or non-musical. |
Audiobb,
I am using the terms to describe:
Overdamped = tight, well defined bass response that may be reduced in level relative to the mid band and beyond. This is often (though not always) characteristic of sealed (particularly acoustic suspension) systems, and less often (though ocassionally) seen in ported speaker systems.
Underdamped = looser, fuller bass that may be elevated in level. This is more often (though not exclusively) found in ported or passive radiator systems and sometimes in infinte baffle sealed systems where the cabinet volume is large relative to certain performance parameters of the woofer.
Technically the terms have a somewhat more precise meaning, but for the purposes of understanding my earlier post, I hope that this is useful shorthand.
Good Luck,
Marty |
Thanks for your answers.Martykl,could you please define "overdamped" and "underdamped"? |
In my system, the amps really shine in the lower octaves. The only caveat is that they may be slightly "bumped up" in the upper bass area (the "warmth" I referred to in my earlier post). The effect is subtle, but audible on certain speakers. As I mentioned, I like this tonal balance on my Merlins, not so much on other speakers I own. As a general rule, I believe that these amps will work better as bass amps with speakers that are slightly overdamped than with those that are underdamped. Just MHO.
Good Luck,
Marty |
Audiobob,
Unfortunately I can't gauge how these amps will work on just bass drivers. I do know that I had the TAD 60 prior and these monos best it in just about every aspect. As far as speed, punch, and deep bass, all I can say is that , with my Vandys, these amps are punchy and musical and do not sound laid back like people think they sound with other amps. I listen to mostly classic rock so I need the characteristics that you mentioned. As far as the technical stuff, best to email Paul. |
What about bass response?If i order these amps, they will be used for the bass drivers only.I intend to use a SET amp on the tweeter and mid driver.Volume control(in TAD-125) is a bonus in this set-up.
The areas i am looking for in the bass are - speed,punch,deep as it can be and tight bass.
Eagleman,i've read your review,and as much as i find it helpfull,i s'd still like to know about the bass a bit more.
Also,TAD's page does not mention whther bipolar or mosFET transistors are used.Any info on the damping factor? |
These are unusual ss amps in that they actually sound "tubey" ... for better and worse. That is, they sound warmer (in my system) than any other ss amps I've owned (Krell KSA 50s, Odyssey Stratos Mono, Bel Canto integrated). As for tube amp "midrange magic", maybe a modest dose, but don't expect the full blown SET experience. For my Merlin VSMs, this is the best ss amp I've heard. For my Verity P/E and my SF Cremonas, the Krell, Bel Canto and Stratos offer plusses and minuses that make the choice less clear cut.
My short answer: If you're looking for a reasonably powerful ss mono amp that has real warmth, few real weaknesses and a modest price tag, you could do much worse.
Good luck,
Marty |
I wrote a review in that section a couple of months ago. These amps are a giant killer. They mate very well with the TAD 150 and my Vandy 2CE signatures. They make the Vandys sound lively, detailed, and transparent. Huge soundstage. Came back over from tubes for these... |
Yes, it would be interesting to hear something from someno who has used these.They seem like an interesting product.Does anyone know do they use bipolar or MOSfet transistors? |
David,
Can you compare it to the TAD 60 which I have? |
lol Paul at Tad just has a sense of humor is all. I have his tad 60 amp and his 2.1 setup to boot. Good, tank built and muuuusical as all get out. |
You're right it's not a joke.
But if you order the Hibachi amp today you get a set of Ginsu speaker cables free. |
This thread was not meant to be a joke. This company puts out some excellent equipment at very reasonable prices. I have his amp and pre. I was just wondering if anyone has had a chance to try this set of monoblocks. |
I don't know about these amps? Something seems odd...
There's really not much room for a charcoal tray at the bottom and the grate doesn't look like its ceramic coated... I figure your steaks will stick! |
Hibachi now this is a great step forward in the field of audio research. Not only can you play music but you can grill on the darn thing all at the same time. |
