series or parallel?

[Jdizzle 10+ year member]

ehhhh after veiwing his homepage, i can see that hes full of shit http://www.ratemypoo.com/ratemy/poo

 

[80INCHES 5,000+ posts]

i agree

80

 

[VereChronicus 10+ year member]

you can't argue that that's not some funny sh*t....literally

 

[stones 10+ year member]

from designing subwoofers for a living.

Do you mean enclosure setups or actual commercial subwoofers?, if so what ones?.

Pm me if needed.

 

[Jdizzle 10+ year member]

you can't argue that that's not some funny sh*t....literally

my statement said nothing about it being funny.....just now adds another peice of evidence that leads to beleive your full of shit

 

[Prowler573 5,000+ posts]

taken from their web site:
TDX Technology TM

Kevlar/Nomex Driver and Neodymium Magnet

Type: Bass Driver

Size: 12 in.

Power Handling NOM/MAX: 800/1600 watts

Sensitivity (2.83V/1m): 86.5 dB SPL

Freq. Response: 20-250

Mounting Depth/Diameter: 8 in. / 11.1 in.

now i'd like to highlight 86.5dB SPL 1w/1m.

How do we achieve this....... low motor strength in regards to it's suspension compliance. you will come across the same answer if you ask DAT what their BL product is on that subwoofer. every one of them will have a trade off and their slightly more firm suspension is simply due to the fact that they want the subwoofer to handle what is it.....800wrms of input.

However, when you take into consideration that the TDX (and it's newer model replacement, the D9) will safely operate within both its thermal and mechanical limitations at considerably more than the rated RMS input what say you then? If the assumption is that this particular driver was given a firmer suspension than a competitor's offering for the higher power handling when you considerably increase the power handling further does the assumption follow that the suspension will be that much stiffer?

the problem is this, they do it with glue. it is a single or dual spider system at most with a higher resin content. that comes off as you play it, the louder you play it the faster the glue goes bye bye. the initial blanket statement of loose suspensions and weak motors was generally pointing in the direction of JL Audio products. whom most users consider to produce "SQ" products. and as far as SQ drivers go, to reproduce SQ level performance....95dB average with 105dB peaks, we can compare the TDX to the lesser W6's and the such as most people can't tell the difference at low volume. But, with that suspension, being stiffer than it's counterpart JL offering, it will need more input power to reproduce the same effect. we can both agree on this?

I reckon so. Can't say I have heard of anyone slinging all the glue off of the spider on their Diamond sub while driving the heck out of it, though. I've seen some Diamond D9 12" subs (coils wired in parallel, by the way) get fed off of D61500.1 amps running at a 1 Ohm load. The higher the volume knob on the source unit was cranked the more volume the subs produced. This was in a vehicle setup specifically for big audio and the 1500.1 amps were getting a full 14.4vdc and it is assumed that at the time they were doing (at the minimum) rated output seeing as the birthsheets for both amps showed factory testing yielded over 1800 watts into a 1 Ohm load. When taking into consideration impedence rise during use and other such factors I'd still guess than each amp was outputting a kilowatt, easily.
Did sloppy surrounds and weak motors enable this to happen?

 

[Jdizzle 10+ year member]

i personally dont see how he can consider a Neo motor to be "weak"

 

[80INCHES 5,000+ posts]

becuz he eats his boogers

80

 

[Jdizzle 10+ year member]

becuz he eats his boogers
80

ouch i bet that one hurt his feelings //content.invisioncic.com/y282845/emoticons/up2something.gif.dd110ecf3ae4b76050d87598f2f8de7c.gif

 

[Eldorado 5,000+ posts]

difference is the Qts and BL, Qes and BL are affected by wiring the subs one way or the other. Qts is changed because of the Qes. BL drops when wired in parallel and goes up when wired in series. For small/medium sealed, you normally want the BL lower like most of the "SQ" subs, loose suspension, huge gap, limp surround and low Fs and weak motor. For vented, if you don't have a suspension and a motor/coil with enough restoring force, you'll just launch the sub. I never wire in parallel on a DVC if at all possible using whatever equipment I have to work with.

The problem with wiring in series on a DVC woofer is that the impedance is so high that most amplifiers cant produce enough wattage to make the woofer perform at its best. More BL doesnt seem like it would cancel out the decreased wattage.Not to mention impedance rise caused by the enclosure.

 

[helotaxi 5,000+ posts]

A few comments...

First, the immature BS in this thread is an example of 99% of the reason that so many people see this forum as a noob forum. The idiots who just troll around trying to start crap run off the majority of the people who actually know anything and want to have an intelligent discussion without having to put up with a bunch of children.

Second, all of the intelligent posts made in this thread have valid points. BL is halved when the coils are wired in parallel, however with equal power, the current is double at 1/4 the impedance so the total motive force (BL*I) is still the same. Also as mentioned, many Class D amp have a hard time with cone control because of a terrible damping factor, especially at low impedances. Class D amps are not good in an SQ install, IMO, even on subs.

Traditional SQ subs were designed to be efficient and accurate and to work in a particular type of enclosure (sealed/ported). Most all JL subs ever built, W7 series being the notable exception, fall into this category. To get the best sound out of them (they are SQ drivers by design) they should be used in a small to medium sealed enclosure and given only a modest amount of power. This is the source of most of the complaints about JL, the complainers want them to be something that they are not. They are meant to sound good at moderate volume while listening to music. They are not SPL subs and are not meant to rattle windows and soak up a ton of power and most complaints that I have heard come from people expecting them to do just that citing that since they are so expensive, they should do whatever I want them to do. That's like saying that a Bentley is a hunk of crap becuase it can't go off-road like a 4X4.

The newer supersubs are designed to get loud and sound good while doing it. One of the major tradeoffs is efficiency. To get loud the sub needs to be able to handle a lot of power, relatively easy from a thermal perspective, but not so from a mechanical one. To survive the sub needed to have tough suspension that was realtively non compliant. To keep a realtively low Fs with a stiff suspension the moving mass had to increase which needed a stiffer suspension to support and the downward spiral begins. As a result the Fs of most of the big subs are relatively high, but other factors allow them to overcome that through basically brute force to still perform as a subwoofer. Most all of these subs WILL loosen up as they are played. The resin in the spider cracks as the sub moves and its stiffness is decreased proportionally. This can take a short time if you really wail on it or a long time if you listen at lower volumes. For example, my XXX has taken almost 18 mos to break in fully because I hardly run any power to it rarely turn it up that loud. The Diamonds are the same way. They are really stiff out of the box but run them for awhile and they WILL loosen up.