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Old 3rd October 2006, 11:00 PM   #1
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Default Another which subwoofer question...

Newbie here... I'm interested in a sub to go with my Fostex 167 ML-TL speakers. All I want is to fill in the bottom end. My requirement are that I want a sound that is solid, well defined and fast. Also that its not too big and with a price of ~$200. Doesn't have to go loud and too deep ~25-30Hz. I want to hear clarity of the notes on a standup string bass. Most of my music is jazz and acoustic pop mixed with a few vintage rock songs.

I want to build only one now but but might think about adding a second one in the future to go with some smaller fullrangers, ie FE 108. Crossed over around 70Hz or so for now.

Can I get away with 10" and a 200W amp? Sealed or ported and which drivers would you suggest for my application?

TIA...
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Old 4th October 2006, 12:34 AM   #2
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10" and 200W should be just fine. I'd go sealed.

If you don't mind a big box, one like this would be great in 3.5cuft:
http://www.partsexpress.com/pe/showd...number=296-434

Or this one in about 1cuft:
http://www.partsexpress.com/pe/showd...number=295-460

Morel has a couple options too if you don't mind increasing your budget a little, and Dayton also has a couple cheaper options than those two.

I didn't check Madisound, but I'm sure there are suitable options there too.
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Old 4th October 2006, 04:39 AM   #3
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Thanks, but let me ask this in a different way. With my requirements about the type of sound I'm looking for what should I be looking for in a subwoof driver and the cabinet itself? As stated earlier I want something fast with a lot of definition. Which cabinet type should I choose and what type of specs should I look for in a driver.

PS. I'm starting my search but still need some direction in which way to go. Too many options out there...
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Old 4th October 2006, 04:51 AM   #4
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Sealed enclosure.

Driver with a strong motor and lightweight cone. I think that first one would be perfect.
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Old 5th October 2006, 03:13 AM   #5
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Quote:
Originally posted by Lothar34
Sealed enclosure.

Driver with a strong motor and lightweight cone. I think that first one would be perfect.
I've been searching around and found out that a seal cabinet is what would work best for me. But 3.5ft^3 is a bit big. Is there something smaller that would work in a sealed cabinet?

What parameters in that speaker tells you that the motor is strong and the cone is lightweight? Maybe there are others that would work in a smaller cabinet.

Would something like the PE 10" Titanic work in my case? I've never heard one before but read that its pretty good. I could probably get that driver and plate amp then build my own cabinet.

Going sealed, now looking for a driver to fit in a smaller chassis...
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Old 5th October 2006, 07:29 PM   #6
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Quote:
Going sealed, now looking for a driver to fit in a smaller chassis...
Than I'd recommend Peerless XLS10

http://www.partsexpress.com/pe/showd...Number=297-604

I has extremely strong motor (Qts is 0,17), low fs, very low distortion and long throw.
You can put it in closed box of 5-10 liters to achieve reasonable Q for music listening.
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Old 5th October 2006, 08:07 PM   #7
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Quote:
Originally posted by RockysDad


I've been searching around and found out that a seal cabinet is what would work best for me. But 3.5ft^3 is a bit big. Is there something smaller that would work in a sealed cabinet?

What parameters in that speaker tells you that the motor is strong and the cone is lightweight? Maybe there are others that would work in a smaller cabinet.

Would something like the PE 10" Titanic work in my case? I've never heard one before but read that its pretty good. I could probably get that driver and plate amp then build my own cabinet.

Going sealed, now looking for a driver to fit in a smaller chassis...
3.5cuft is big. You can make it around 2.5cuft if you put a good amount of fill in there.

Most places won't actually list the weight of the cone, but that one is a carbon fiber and it says in the description that it's lightweight.

That Peerless is a good sub, but I don't think they intended it for sealed enclosures. You'd need .19 cubic feet for a Qtc of .707, and that's terribly small.
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Old 6th October 2006, 03:08 PM   #8
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Default Lets talk numbers...

Specifications: *Power handling: 350 watts RMS/600 watts max *VCdia: 2-1/2" *Le: .95 mH *Impedance: 4 ohms *Re: 3.3 ohms *Frequency range: 22 - 1,000 Hz *Fs: 22 Hz *SPL: 87 dB 2.83 V/1m *Vas: 2.12 cu. ft. *Qms: 2.80 *Qes: .45 *Qts: .39 *Xmax: 14mm *Dimensions: A: 10-1/2", B: 9-1/4", C: 5".

Here are the specs for the Dayton 10" RSS265HF. When I ran this driver through a sealed sub calculator, the recommended enclosure came out to be 1.5ft^3. The Qtc was set to .707. This would drop a bit if the enclosure went a little larger.

This driver seems that it would fit my needs but what spec would tell me it has a strong motor and would be quick? Qts is mentioned by Cro maniac but which way is better, more or less? What does this spec mean anyway and why? What about all the rest? What do they mean and why are they important?

Much to learn...
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Old 6th October 2006, 05:16 PM   #9
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Nothing to add except I have the same drivers and am looking to do pretty much the same thing - use a sub to fill in the bottom. Your questions are the same as mine, so please be sure to share what you learn. Thanks.
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Old 6th October 2006, 06:54 PM   #10
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http://hometheaterhifi.com/forum/showthread.php?p=10678

Quote:
BL------Expressed in Tesla meters, this is a measurement of the motor strength of a speaker. Think of this as how good a weightlifter the
transducer is. A measured mass is applied to the cone forcing it back while the current required for the motor to force the mass back is measured. The formula is mass in grams divided by the current in amperes. A high BL figure indicates a very strong transducer that moves the cone
with authority!
Quote:
Q Parameters---------Qms, Qes, and Qts are measurements related to the control of a transducer's suspension when it reaches the resonant
frequency (Fs). The suspension must prevent any lateral motion that might allow the voice coil and pole to touch (this would destroy the
loudspeaker). The suspension must also act like a shock absorber. Qms is a measurement of the control coming from the speaker's mechanical suspension system (the surround and spider). View these components like springs. Qes is a measurement of the control coming from the speaker's electrical suspension system (the voice coil and magnet). Opposing forces from the mechanical and electrical suspensions act to absorb shock. Qts is called the 'Total Q' of the driver and is derived from an equation where Qes is multiplied by Qms and the result is divided by the sum of the same.

As a general guideline, Qts of 0.4 or below indicates a transducer well suited to a vented enclosure. Qts between 0.4 and 0.7 indicates
suitability for a sealed enclosure. Qts of 0.7 or above indicates suitability for free-air or infinite baffle applications. However, there
are exceptions!
You won't often find the weight of the cone assembly listed with the driver's specs. I'm pretty sure paper is the heaviest though.
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