8'' two-way any reason why not?

[dthomas]

Re: 8'' two-way any reason why not?

Well, after seeing those tests results, I think I'm out of the running for those M&D's. I've been searching for a larger tweeter. Anyone know where I could find one?

Where did you find test results for the M&Ds?

As Scott brought the Aura 2" would be a good choice. I modeled it with a RS 10" woofer crossed at 800Hz once and it worked pretty well. The project kinda fizzled so I don't have the data anymore.

It was for background tunes in a cafeteria at a graphic design company that a freind worked at. The owner bought some Berhringer DJ speakers and called it good. That was my initial recommendation as it was just to play at a moderate level and keep his employees stoked.

Dave

[gowa]

Re: 8'' two-way any reason why not?

Where did you find test results for the M&Ds?

As Scott brought the Aura 2" would be a good choice. I modeled it with a RS 10" woofer crossed at 800Hz once and it worked pretty well. The project kinda fizzled so I don't have the data anymore.

It was for background tunes in a cafeteria at a graphic design company that a freind worked at. The owner bought some Berhringer DJ speakers and called it good. That was my initial recommendation as it was just to play at a moderate level and keep his employees stoked.

Dave

Here:

http://techtalk.parts-express.com/showthread.php?t=208287

Boy, it sure would be nice to see measurements of those Alpairs.

http://markaudio.com/

[dthomas]

Re: 8'' two-way any reason why not?

Here:

http://techtalk.parts-express.com/showthread.php?t=208287

Boy, it sure would be nice to see measurements of those Alpairs.
http://markaudio.com/

Wow... I saw those after I wrote the last post. What a disappointment not exactly what you would expect from a driver of that price. I suspect all the detail they think they are hearing is all that high odd order distortion. Just goes to show what folks will pay for if you set the price high enough.

[Max_Andrews]

Re: 8'' two-way any reason why not?

Also consider the Neo8! Can be crossed at 700hz easily and is very low distortion, not to mention very cheap for this kind of performance!

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=264-713

[gowa]

Re: 8'' two-way any reason why not?

Also consider the Neo8! Can be crossed at 700hz easily and is very low distortion, not to mention very cheap for this kind of performance!
http://www.parts-express.com/pe/show...number=264-713

Yep, I did consider them but boy, you just don't get much uglier than the Neo8.

[Hi Fi Guy]

Re: 8'' two-way any reason why not?

A two-way using a 8" woofer is very normal, but it is more popular these days to use smaller woofers in a two-way. That is not the case throughout the 1970's however when 8, 10 and even 12 inch two-ways were common. The crossover should not exeed 2.2kHz generally, 1.8Khz is even better, but this is only a guideline.

There is a popular, expensive well-reviewed two-way available commercially from Spendor that crosses over the eight-inch woofer to a tweeter at about 5kHz, so, no rule is iron clad. Depends on many things, not the least of which is the quality and properties of the 8" woofer.

[nooboob]

Re: 8'' two-way any reason why not?

You didn't mention your application or listening configuration preferences but many of the most respected studio monitors are 8" woofers paired with 1" tweeters. Most all of these however use active xovers and are biamped. I have a pair of Events of this sort that I like a lot. They do not use true delays to time align the tweeters but probably use phase correction to align them at the xover freq--not sure about that--anyone here know?

[Taterworks]

Re: 8'' two-way any reason why not?

I can say this: After hearing the Wilson Audio Duet (8" paper mid-woofer of decent quality, Scan-Speak AirCirc tweeter) at an audio shop today, you're going to have a hard time convincing me that an 8" two-way is in any way a fundamentally flawed design.

While I'm sure I don't have Dave Wilson's ears or his crossover mojo, I'm feeling a lot better about my own 8" two-way design (awaiting construction) which will use the 8" Audax shielded HD-Aerogel woofer and everyone's favorite low-Fs tweeter, the Seas 27TDFC in a large stand-mount acoustic-suspension monitor. If it's at least as good as my parents' older Fried Model Q, I'll be happy. I like large-midbass designs for their very solid and energetic lower midrange performance, which is essential to the warmth of many instruments.

[Todd G.]

Re: 8'' two-way any reason why not?

I can say this: After hearing the Wilson Audio Duet (8" paper mid-woofer of decent quality, Scan-Speak AirCirc tweeter) at an audio shop today, you're going to have a hard time convincing me that an 8" two-way is in any way a fundamentally flawed design.

While I'm sure I don't have Dave Wilson's ears or his crossover mojo, I'm feeling a lot better about my own 8" two-way design (awaiting construction) which will use the 8" Audax shielded HD-Aerogel woofer and everyone's favorite low-Fs tweeter, the Seas 27TDFC in a large stand-mount acoustic-suspension monitor. If it's at least as good as my parents' older Fried Model Q, I'll be happy. I like large-midbass designs for their very solid and energetic lower midrange performance, which is essential to the warmth of many instruments.

Agreed. And where have you been?

[Taterworks]

Re: 8'' two-way any reason why not?

Where have I been? Oh, right...the Duettes. I heard them in Ovation's high-end showroom on the north side of Indianapolis, and they did what it says on the tin -- they sounded like well-placed standmount monitors, even though they were in the resonant cavity created by an actual bookshelf, making them true 'bookshelf' speakers. They were really incredible. Of course, the interchangeable resistors in the "Novel" outboard crossover modules have something to do with this. I imagine they determine the magnitude of the baffle step filter.

Or, if you're simply wondering why I haven't been around the Tech Talk forums as much, it's because I've been inhaling plenty of MDF dust, trying to get two pairs of identical two-way (7"/1") bookshelf monitors ready for my two cousins in Detroit. They won't be ready by Christmas day, unfortunately, but my cousins will receive them very shortly afterward.

[terentellie]

Re: 8'' two-way any reason why not?

I made 2-way design using part # 299-128 (Peerless 850136) 8" woofer along with a Vifa 1" dome and a Dayton 10" passive in a .88 cubic ft box. I crossed the tweeter over at 3.5KHz 18dB/octave. I feel I got excellent results. Blew away my friends Polk RT 55i speakers that had 2 6.5 along with a 1" dome. The mids sound excellent and since the woofer hardly moves because the passive does all the work, I do not hear any issues at all. I have 3 pairs of these driven by 3 hafler DH220 amps. They are very efficient great imaging in two channel at the sweet spot. I can't complain at all. They do slop off quickly below 50Hz but since I have 2 15" subs and a 12" sub I get excellent balance. I had a friend who works for Pass Labs audition my system and over all he was pretty impressed. So all in all I wouldn't worry about the issues surrounding an 8" two way design. Just crossover your tweeter high enough to get the power-handling you need while keeping frequency gaps at bay. I listen to music like Tori Amos, a lot of pianos, organs and female vocals and they sound very balanced and clean.

[brianpowers27]

Re: 8'' two-way any reason why not?

You didn't mention your application or listening configuration preferences but many of the most respected studio monitors are 8" woofers paired with 1" tweeters. Most all of these however use active xovers and are biamped. I have a pair of Events of this sort that I like a lot. They do not use true delays to time align the tweeters but probably use phase correction to align them at the xover freq--not sure about that--anyone here know?

I own a pair of m-audio bx-8 monitors that are configured just as you described. I imagine that they are using the equivalent of the bi-amp plates that PE and MCM sell. These have a electrical 4th orderx-over. I imagine that the total system has a at least a 6th order x-over.

I haven't done the math but I figure that the acoustic center of the tweeter is further forward than the woofer. The instructions for my speakers said that your ear should be in-line with the top of the woofer. This should correct for some of the phase difference due to physical alignment. I don't imagine that any phase correction is provided in the x-over, especially for the price of the speakers.

[jdclark]

Re: 8'' two-way any reason why not?

ENOUGH of the off-axis response complaints. All you people do have your setups positioned so you are listening in an ON-axis position dont you?

[DS-21]

Re: 8'' two-way any reason why not?

ENOUGH of the off-axis response complaints. All you people do have your setups positioned so you are listening in an ON-axis position dont you?

Of course not. That would be silly. I listen with my speakers over-toed, so that their axes cross in front of the listening position.

Besides, the direct-in-line signal is a very small portion of what you hear. The power response is what's really important, and IMO what's key there is making sure that there are no abrupt transitions, especially in the midrange. Without controlling the directivity of the tweeter at the bottom of its passband, that's not going to happen with a 4" 2-way, let alone an 8" 2-way.

[spasticteapot]

Re: 8'' two-way any reason why not?

I've got some Seas P21REX/P 8" woofers and some Vifa D27TG35-06 tweeters I picked up cheaply that I'd like to use in a 2-way like the "Pipes" on the PE projects section.

http://www.parts-express.com/projectshowcase/indexn.cfm?project=Pipes

Do you think this would work well in a 2-way crossed over around 1.8khz? Or should I hunt down some cheap dome mids? I'd obviously need a crossover with steeper slopes than the original 1st-order unit, and of course, the cabinets would need to be bigger, too.