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What kind of tweeterhorn does the 7pi use? [message #46762]

Tue, 26 April 2005 20:02

Kim Schultz
Messages: 85
Registered: May 2009

Viscount

I´m trying to put a 7pi together using drivers I already have.
But I doesn´t have any tweeter horns.

What horn does the 7pi use.

Regards
Kim

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Re: What kind of tweeterhorn does the 7pi use? [message #46765 is a reply to message #46762]

Wed, 27 April 2005 01:56

Wayne Parham
Messages: 18835
Registered: January 2001

Illuminati (33rd Degree)

It uses a 1" compression driver on a 90x40 horn. Specific models are the Eminence PSD2002 or the JBL 2426 mounted on an Eminence H290 horn flare.

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Thx Wayne. [message #46766 is a reply to message #46765]

Wed, 27 April 2005 07:32

Kim Schultz
Messages: 85
Registered: May 2009

Viscount

I´ll see if I can find a driver and horn flare that will work.
Already have the 10" and 15" driver.

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Re: Thx Wayne. [message #46767 is a reply to message #46766]

Wed, 27 April 2005 08:29

Wayne Parham
Messages: 18835
Registered: January 2001

Illuminati (33rd Degree)

Sounds good. What midrange driver do you have? Just to make sure you noticed - The crossover is different depending on the driver chosen.

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Re: Thx Wayne. [message #46781 is a reply to message #46767]

Wed, 27 April 2005 17:53

Kim Schultz
Messages: 85
Registered: May 2009

Viscount

I have a cheap driver from Monacor, but it models very closely to the Delta 10 when simulated in Hornresp.

SP-10/100PA
PA bass-midrange speaker, 200WMAX, 8Ω
With high power capability and linear frequency response.

Technical datasheet

Impedance (Z) 8Ω
Resonant frequency (fs) 65Hz
Max. frequency range f3-5,000Hz
Music power 200WMAX
Power rating (P) 100WRMS
SPL (1W/1m) 98dB
Suspension compl. (Cms) 0.18mm/N
Moving mass (Mms) 31g
Mech. Q factor (Qms) 4.10
Electr. Q factor (Qes) 0.42
Total Q factor (Qts) 0.38
Equivalent volume (Vas) 32 l
DC resistance (Re) 6.9Ω
Force factor (BxL) 14.4Tm
Voice coil induct. (Le) 0.75mH
Voice coil diameter 50mm
Voice coil former Kapton
Linear excursion (XMAX) ±2.5mm
Eff. cone area (Sd) 350cm2
Magnet weight 50oz.
Weight 4.1kg

I´m having problems with your program, trying to figure out the pi alignment for the 15" driver.

SP-15/300PA
High-quality PA speakers for universal stage and professional DJ applications. Excellent manufacture and optimum specifications for powerful bass-reflex speaker systems.
PA bass speaker, 600WMAX, 8Ω
Very high efficiency for bass applications, max. bass pressure in the medium bass range in astonishingly small cabinets.

Technical datasheet

Impedance (Z) 8Ω
Resonant frequency (fs) 38Hz
Max. frequency range f3-4,500Hz
Music power 600WMAX
Power rating (P) 300WRMS
SPL (1W/1m) 101dB
Suspension compl. (Cms) 0.23mm/N
Moving mass (Mms) 88g
Mech. Q factor (Qms) 5.44
Electr. Q factor (Qes) 0.29
Total Q factor (Qts) 0.27
Equivalent volume (Vas) 232 l
DC resistance (Re) 6.8Ω
Force factor (BxL) 22.2Tm
Voice coil induct. (Le) 1.3mH
Voice coil diameter 78mm
Voice coil former Kapton
Linear excursion (XMAX) ±3mm
Eff. cone area (Sd) 855cm2
Magnet weight 65oz.
Weight 7.5kg

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Re: Thx Wayne. [message #46783 is a reply to message #46781]

Wed, 27 April 2005 18:09

Wayne Parham
Messages: 18835
Registered: January 2001

Illuminati (33rd Degree)

I'm not as concerned with the bottom end, which Hornresp does a good job of modeling because cone motion is pistonic. I'm more concerned with the behavior of the driver at the upper end of its response curve. That's more determined by cone shape, including the dust cap.

If you have anything to make measurements with, you might verify the mid/tweeter crossover point. If not, then look at the manufacturer's spec sheet. If the speaker has a lot of energy above 2kHz, you probably want the midrange coil and if not, then probably not. Look at the crossover schematic and the notes about different drivers for some examples.

Your woofer models very much like JBL 22xx woofers. It will work very nicely in the Stage, Professional or Audiophile Series seven π bass bin. I think your speakers will work out very well if you build them exactly like the plans show, but maybe verify the midrange/tweeter crossover and choose the midrange circuit that suits your drivers best.

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