AV123 x-statik Tower Loudspeaker

[TLS Guy]

Why does a speaker with that many drivers and decent size cabinet only have the following frequency response:

Frequency Response: 65 Hz to 20 KHz (± 3 dB)

Because it has two 6.5 inch drivers in a sealed enclosure. That is what you would expect. Don't forget roll off will be 12 db per octave. However bass performance no better than most bookshelves.

However, I would bet the 200 Hz crossover is first order, and a zobel may not have been included, so that the lower drivers are rolling off very gradually to fill in for the two small drivers, in the very narrow baffle were diffraction and cancellation losses have to be severe.

Peerless India have been around since 1977. They make a large range of cheap OEM drivers. Tymphany, I don't think picked them up in the merger.

The India line was always separate from the Scandinavian Peerless line.

I have never seen any of their offerings I would be tempted to use. Madisound have not put their offering in their product list.

 

[Sean Parque]

Just a quick note on drivers: The woofers are made by Peerless India to our exact parameters. They would be the same if Peerless Denmark made them or whoever else. We use Peerless India because they are responsive to our requests, priced reasonable and their defect rate is extraordinarily low.

Thanks,

Sean

 

[TLS Guy]

Just a quick note on drivers: The woofers are made by Peerless India to our exact parameters. They would be the same if Peerless Denmark made them or whoever else. We use Peerless India because they are responsive to our requests, priced reasonable and their defect rate is extraordinarily low.

Thanks,

Sean

Thanks for the info. I knew those drivers were not in their current OEM list, as none could fit your specifications. Nice to know they are doing a good job for you.

Did I guess the 200Hz crossover somewhat close?

 

[Sean Parque]

Crossover: 200Hz & 1800Hz, 3rd order electrical slope on the tweeter, midrange low pass is 3rd order electrical and high pass is 1st order electrical. The woofer low pass slope is 2nd order electrical. Acoustically they all match.

Did I guess the 200Hz crossover somewhat close?

 

[TLS Guy]

Crossover: 200Hz & 1800Hz, 3rd order electrical slope on the tweeter, midrange low pass is 3rd order electrical and high pass is 1st order electrical. The woofer low pass slope is 2nd order electrical. Acoustically they all match.

So the sealed bass speakers are down 12 db by 400 Hz. I'm surprised that compensates for the cancellation and diffraction losses of the open baffle drivers.

 

[Sean Parque]

TLS,

Maybe once we are shipping these in big quantities you can catch someone in MN and listen to theirs. Post an audition request on the AV123 forum in a few weeks and you should find someone close

Sean

 

[TLS Guy]

So the sealed bass speakers are down 12 db by 400 Hz. I'm surprised that compensates for the cancellation and diffraction losses of the open baffle drivers.

In the lakes country of North Central Minnesota I doubt there will be one near by!

 

[Sean Parque]

Why - is that waaaay out there in BFE?

Sean

In the lakes country of North Central Minnesota I doubt there will be one near by!

 

[TLS Guy]

Why - is that waaaay out there in BFE?

Sean

Yes, we are 200 miles from the Twin Cities. I'm not really interested in those speakers. I'm just curious with that design, I always am when a speaker is out of the mold. There has to be a substantial first order roll off from the open baffle speakers. The second order woofer crossover it seems to me would make a poor splice with the open baffle drivers. Therefore you would have to rely on speaker placement and room gain to help out. I suppose, though, you did not want the impedance to drop down to 2 ohms or below, if you made the sealed woofers fill in the loss all the way. Then you would have had budget speakers needing a high priced amp. It seems to me there has to be a compromise here.

Here are my speakers.

http://mdcarter.smugmug.com/gallery/2424008_RKGvb#127077317

 

[Sean Parque]

TLS,

There has to be a substantial first order roll off from the open baffle speakers. The second order woofer crossover it seems to me would make a poor splice with the open baffle drivers.

Not really... The mids already have a natural first order roll off. Adding the first order high pass filter to it creates a higher order acoustic roll off. This perfectly matches the roll off of the woofers that use a second order (electrical) low pass filter.

Therefore you would have to rely on speaker placement and room gain to help out.

Room gain is not needed to yield a flat response.

I suppose, though, you did not want the impedance to drop down to 2 ohms or below, if you made the sealed woofers fill in the loss all the way.

There is a crossover between those sets of drivers. It is not a 2.5 way design. The drivers sum perfectly without any low impedance load just like any other three way design.

So the sealed bass speakers are down 12 db by 400 Hz.

Acoustically they are down more than 18db by 400Hz.

...so that the lower drivers are rolling off very gradually to fill in for the two small drivers, in the very narrow baffle were diffraction and cancellation losses have to be severe.

The diffraction is minimized by the narrow baffle and cancellation of the dipole effect is only at 90 degrees off axis. Off axis measurements show loss of output to be extremely balanced and much better than most other speakers (if you don't mind me saying )