Sq 8" Subwoofer

[FLYONWALL9@AOL. 10+ year member]

I need a little help. I've posed this question on other boards

and had some good reply's. Just looking for a bit more or

perhaps different perspective.

The sub should perform well with 200rms into a 4 ohm load,

prefer a ported enclosure, so the driver should be fairly efficient

90+db. The basket of the sub will be mounted outside of the

enclosure. Tuned pretty low, it will have no midbass duties, I

have a pair of Quart 8s for that. Somewhat light weight and not

greater than 5" mounting depth. The car is semi open air but not

a convertible, a Targa. The orientation of the subs will be in the

back of the vehicle firing forward, like I said into the enclosure;

the ports will vent vertical. I almost forgot one of the major

limitations, cost, should be not greater than 110 per driver x2.

IF you have one of the modeling software and can model the

sub you suggest EVEN BETTER. I have yet to get any real

world or simulated results.

The front runner so far is one of the Tang Band 8" drivers with

a Neo motor.

THANKS FOR YOUR HELP!

Click to read more...

 

[RAM_Designs 5,000+ posts]

I'd personally go with the Dayton HF 8" sub at partsexpress.com, the only thing it's lacking is the efficiency that you want(which isn't realistic given that you're wanting an 8" SQ sub).

 

[Ray21 10+ year member]

I'd personally go with the Dayton HF 8" sub at partsexpress.com, the only thing it's lacking is the efficiency that you want(which isn't realistic given that you're wanting an 8" SQ sub).

x2

 

[ciaonzo 5,000+ posts]

I'd personally go with the Dayton HF 8" sub at partsexpress.com, the only thing it's lacking is the efficiency that you want(which isn't realistic given that you're wanting an 8" SQ sub).

x3

Although those like relatively large vented enclosures. Sealed is a nice option for those if used in a vehicle, especially for SQ.

 

[Louisiana_CRX 5,000+ posts]

What kinda vehicle do you have ?

 

[supermaxx123 10+ year member]

What kinda vehicle do you have ?

dude he said targa, an 8 would work in there nicley. cant recommend anything i've heard for you

 

[Toxic Tuan 10+ year member]

DD 1508's will give you great linear response if you have a ported enclosure with sufficient air space. High motor strength, low mms is the key to SQ in a ported enclosure.

Tuan

 

[Ronmeister]

DD 1508's will give you great linear response if you have a ported enclosure with sufficient air space. High motor strength, low mms is the key to SQ in a ported enclosure.
Tuan

If you don't mind, could you explain this further? Mostly the "mms?"

I'd just like to know for future reference.

Thanks,

Ron

 

[supermaxx123 10+ year member]

DD 1508's will give you great linear response if you have a ported enclosure with sufficient air space. High motor strength, low mms is the key to SQ in a ported enclosure.
Tuan

cant wait to listen to your DD setup!

 

[Toxic Tuan 10+ year member]

If you don't mind, could you explain this further? Mostly the "mms?"I'd just like to know for future reference.

Thanks,

Ron

It refers to low moving mass. The lighter the cone, the more agile it is hence more responsive. Cones are made up of all sorts of materials. Some cones are lighter than others. DD's philosophy is exactly that and they're recently upgraded their standard drivers with a new yellow cone (no not the kevlar). They make them black by applying a wetlook on the cone. However, if you look on the back of the new cones, they're yellow. This cone is from an american company and china does not have this cone available.

Tuan

 

[azimuth 5,000+ posts]

the tang band aluminum 8 models up well ported. 1 cube, flat to almost 30 hz. the dayton models up well also, but the enclosure is over 1.5 cubes.

 

[Louisiana_CRX 5,000+ posts]

the DD 8's won out in the big 8 sq against several 8's a few years ago...the test was done with a 1008a sealed....there were about 8 different 8's tested.....you may can do a search and bring up the test results...

 

[Louisiana_CRX 5,000+ posts]

dude he said targa, an 8 would work in there nicley. cant recommend anything i've heard for you

there are all sorts of cars with Targas...Targa is not a brand .....my Porsche 911 Carrera has a Targa roof...so does my Porsche 914....some Supras...Some Vettes...some Acura NSX's....the Fiat X19....a Lotus Elise...the Pontiac Solstice Coupe....a Honda Del Sol several different Ferrari's....and I'm sure many more...depending on which Targa vehicle would depend on the room he might have to spare as to which sub could fit his needs...//content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[PV Audio 5,000+ posts]

DD 1508's will give you great linear response if you have a ported enclosure with sufficient air space. High motor strength, low mms is the key to SQ in a ported enclosure.
Tuan

I'm sorry Tuan, but that just isn't true. In fact, if your Mms is too low, you can encounter serious cone breakup which sounds absolutely horrible. What you really want are soft parts that couple well with the motor: low inductance, high compliance and linear BL as the VC leaves the gap. The mass of the cone doesn't grant you greater SQ, and to prove the point, many home audio subwoofer DIYers add lead weights to their speakers to lower the Fs without sacrificing sound quality. I'm not talking cheap speakers, I'm talking SS RL-P 18s, RL-S 15s, Dayton Titanic 15s, Adire Brahma 15s, Ascendant Ava 18s, etc and all are just as clean as before. The low frequency bandwidth is therefore slightly increased.
What is true, however, is that while excursion may be lessened, the cone is still changing direction at the same rate since the transient response is due to having a low inducting voice coil, not the mass of the moving parts. That voice coil has a set inductance value regardless of what mass is resting on it be it a sheet of construction paper or a brick. It's a purely electrical property, and that means that the VC is attracted and repelled at a speed dependent on the inductance of the coil alone, not what's attached to one end of it. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[cam5860 10+ year member]

Image Dynamics ID3 all day long cuz! I have four of them in a regular cab. Best subs I have ever heard. 120 Bucks at woofersetc.com. 200 watts is perfect for these.