Quick crossover questions

Grahamt · 9th September 2004, 07:30 PM

Couple of hypothetical questions,

If I have a 8 Ohm midrange, 88 dB (2.83V 1m) sensitivity and want to pair it to a 4 Ohm tweeter also with a 88 dB (2.83V 1m) , are they actually going to play at the same volume? I dont see why not but maybe I am missing something.

Also, lets say I have a tweeter with an 8 ohm nom. impedance, and want to cross it over at 4 kHz. The actual impedance from say 2kHz to 6kHz is 7 Ohms, should I use the 8 or 7 Ohm number in my crossover calculations.

Thanks in advance
Graham

Edit: Also, does anyone have any experience with the Hi Vi TN28?

jomor · 9th September 2004, 07:49 PM

Hi,

you should use the 7Ù value for your calculations.

Grahamt · 9th September 2004, 09:49 PM

Thanks Jomor

What about the first part,

Quote:

If I have a 8 Ohm midrange, 88 dB (2.83V 1m) sensitivity and want to pair it to a 4 Ohm tweeter also with a 88 dB (2.83V 1m) , are they actually going to play at the same volume?

Anyone know this one?

Thanks in advance

Salas · 10th September 2004, 12:35 AM

the 2.83V spec tells same SPL. Speakers are voltage controlled. Consumed power by them is a result, not the SPL governor.
The 4OHM unit is just going to use up twice the power than an 8 OHM one with same SPL sec @ 8 OHM. But its peanuts when talking tweeters. Plus after BSC correction you gonna need to pad it down so it will approach 8 OHM with the added resistance anyway.

Grahamt · 10th September 2004, 01:12 AM

Thanks Salas

9th September 2004, 07:30 PM	#1
Grahamt diyAudio Member Join Date: Mar 2004 Location: U of Waterloo	Quick crossover questions Couple of hypothetical questions, If I have a 8 Ohm midrange, 88 dB (2.83V 1m) sensitivity and want to pair it to a 4 Ohm tweeter also with a 88 dB (2.83V 1m) , are they actually going to play at the same volume? I dont see why not but maybe I am missing something. Also, lets say I have a tweeter with an 8 ohm nom. impedance, and want to cross it over at 4 kHz. The actual impedance from say 2kHz to 6kHz is 7 Ohms, should I use the 8 or 7 Ohm number in my crossover calculations. Thanks in advance Graham Edit: Also, does anyone have any experience with the Hi Vi TN28?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
2 quick SI questions	Decker	Class D	2	26th November 2007 11:30 PM
2 quick questions	JPeitzman	Chip Amps	7	22nd July 2007 05:27 PM
2 quick questions	Lowjacker	Car Audio	3	8th July 2006 03:32 AM
Quick Question About a Crossover	Wyloch	Multi-Way	5	2nd March 2005 06:00 AM
quick questions	theChris	Multi-Way	0	12th February 2003 04:54 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

9th September 2004, 07:49 PM	#2
jomor diyAudio Member Join Date: Feb 2004 Location: Athens	Hi, you should use the 7Ù value for your calculations.

10th September 2004, 12:35 AM	#4
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	the 2.83V spec tells same SPL. Speakers are voltage controlled. Consumed power by them is a result, not the SPL governor. The 4OHM unit is just going to use up twice the power than an 8 OHM one with same SPL sec @ 8 OHM. But its peanuts when talking tweeters. Plus after BSC correction you gonna need to pad it down so it will approach 8 OHM with the added resistance anyway.

10th September 2004, 01:12 AM	#5
Grahamt diyAudio Member Join Date: Mar 2004 Location: U of Waterloo	Thanks Salas