2-way large bookshelf design

Nm2285 · 17th September 2004, 04:03 AM

I recently designed and built a 2-way bookshelf speaker project. I'm thrilled with the results. They've replace my NHT SB2s. Their overall clarity, detail, and soundstage have thoroughly impressed me. Their one weakness is a bit of bass deficiency (+/- 3dB at 67 Hz). I had a sub going into the project, so this didn't bother me too much. Here's a brief design description in case it inspires anyone:

Drivers: Peerless 850122
Vifa XT19
Approximate volume of enclosure: .52 cu ft.
External Dim of enclosure: 9.5"x10.5"x14"
Material: 3/4" MDF

Crossover: 4th Order Linkwitz-Riley at 2700 Hz (this avoids distortion in the Vifa and a bit of unevenness in the Peerless).

I offset the center of the tweeter 1 inch from the center of the midrange. One brace (3x8) was attached to the back and sides. The box was sealed using polyurethane glue. The drivers were flush mounted. Most materials were purchased from Madisound; they were great to deal with.

Total cost was about $350.

I also made my own stands for them using some of the leftover MDF and PVC pipe. I connected the bases across the pipe using 3/8" all-thread rod. They are sand filled, attached to the PVC with polyurethane glue, and caulked to ensure a tight seal.

They're mated with a HK DVD101 and a NAD C370. I'm very satisfied with the results of my first project.

Grahamt · 17th September 2004, 04:11 AM

pics please

Glad you are thrilled with the results.
Any BSC, impedance correction, etc I am interested in any details. I cant afford to do your project but the details may help me with my own.

Dave Bullet · 17th September 2004, 08:11 AM

If you are willing...

I would appreciate details on the crossover you used. I presume a vented box? If so - what was your tuning freq.

Thanks,
David.

Nm2285 · 18th September 2004, 08:06 PM

I actually used a sealed enclosure (thus the reason for the lack of bass). I wasn't worried about bass response and the ideal port would have been quite large, so I bypassed it.

I'll post details in a day or two...

Nm2285 · 21st September 2004, 02:56 AM

Crossover is attached.

jleaman · 21st September 2004, 03:38 AM

pic's?

17th September 2004, 04:03 AM	#1
Nm2285 diyAudio Member Join Date: Aug 2004 Location: Delaware	2-way large bookshelf design I recently designed and built a 2-way bookshelf speaker project. I'm thrilled with the results. They've replace my NHT SB2s. Their overall clarity, detail, and soundstage have thoroughly impressed me. Their one weakness is a bit of bass deficiency (+/- 3dB at 67 Hz). I had a sub going into the project, so this didn't bother me too much. Here's a brief design description in case it inspires anyone: Drivers: Peerless 850122 Vifa XT19 Approximate volume of enclosure: .52 cu ft. External Dim of enclosure: 9.5"x10.5"x14" Material: 3/4" MDF Crossover: 4th Order Linkwitz-Riley at 2700 Hz (this avoids distortion in the Vifa and a bit of unevenness in the Peerless). I offset the center of the tweeter 1 inch from the center of the midrange. One brace (3x8) was attached to the back and sides. The box was sealed using polyurethane glue. The drivers were flush mounted. Most materials were purchased from Madisound; they were great to deal with. Total cost was about $350. I also made my own stands for them using some of the leftover MDF and PVC pipe. I connected the bases across the pipe using 3/8" all-thread rod. They are sand filled, attached to the PVC with polyurethane glue, and caulked to ensure a tight seal. They're mated with a HK DVD101 and a NAD C370. I'm very satisfied with the results of my first project.

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17th September 2004, 04:11 AM	#2
Grahamt diyAudio Member Join Date: Mar 2004 Location: U of Waterloo	pics please Glad you are thrilled with the results. Any BSC, impedance correction, etc I am interested in any details. I cant afford to do your project but the details may help me with my own.

17th September 2004, 08:11 AM	#3
Dave Bullet diyAudio Member Join Date: Jan 2002 Location: Wellington, New Zealand	If you are willing... I would appreciate details on the crossover you used. I presume a vented box? If so - what was your tuning freq. Thanks, David.

18th September 2004, 08:06 PM	#4
Nm2285 diyAudio Member Join Date: Aug 2004 Location: Delaware	I actually used a sealed enclosure (thus the reason for the lack of bass). I wasn't worried about bass response and the ideal port would have been quite large, so I bypassed it. I'll post details in a day or two...

21st September 2004, 03:38 AM	#6
jleaman Banned Join Date: Apr 2002	pic's?

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