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Multi-Way Conventional loudspeakers with crossovers

Matching amplifier to loudspeaker question(s)
Matching amplifier to loudspeaker question(s)
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Old 31st December 2017, 01:05 AM   #11
globalplayer is offline globalplayer  Germany
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High damping factor is a advantage and will help precise bass reproduction.
Although connectors and cables will influence df greatly the value you are starting with so to speak will make a difference.

If you got 4 ohm speakers be sure the amp is also 4 ohm rated.

Also when the damping factor is specified it is usually at 8 ohms.
If you got 4 ohm speakers the damping factor will only be half of the 8 ohm value.
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Old 31st December 2017, 01:54 AM   #12
montana1 is offline montana1  United States
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Thanks globalplayer,
That is great information to know how amps are rated. I really appreciate your insight on this subject.

Best Regards,
Rich
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Old 31st December 2017, 05:57 AM   #13
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by montana1 View Post
Could you elaborate some on your methods used to match amp to speakers?
A load that varies with frequency can impose differently upon an amplifier vs frequency. This is unrelated to anything useful. It might not be an issue. If it is you can make your load appear resistive, ie constant impedance magnitude (and phase) vs frequency using passive components against your speaker (next to the amp). You would need to measure and adjust.

Last edited by AllenB; 31st December 2017 at 06:09 AM.
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Old 31st December 2017, 06:08 AM   #14
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by eriksquires View Post
In theory, a perfect amp has zero output impedance. <snip> a lot of very good amps are not so great, especially tube amplifiers that use transformer coupled outputs.
A Voltage source has a zero output impedance. A current source has an infinite output impedance. Different strokes..
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Old 31st December 2017, 03:06 PM   #15
montana1 is offline montana1  United States
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Thanks AllenB,
I appreciate you taking the time to share your thoughts on the subject!

Have A Happy New Year,
Rich
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Old 31st December 2017, 03:27 PM   #16
Lojzek is offline Lojzek  Croatia
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Hi Rich, a perfect DIY amp in my view and considering my needs, is the one explained in G.Randy Slone's "The Audiophile's Project Sourcebook". Post #4067
Post your Solid State pics here.
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Old 31st December 2017, 04:07 PM   #17
OllBoll is offline OllBoll  Sweden
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Depends on what your speaker is designed for. If it is a voltage source designed speaker then low output impedance is better.

If you are going active and cross the midwoofer, midrange and above say 2 octaves above fs then a high output impedance is great. Mostly because the distortion above fs in a speaker is dependant on current so with constant current => less distortion. I did some measurements with a 6nd430 a while ago.

High output impedance does impact the frequency response though so you have to take that into account when designing the speaker.
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Old 31st December 2017, 04:44 PM   #18
eriksquires is offline eriksquires  United States
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Allen,

Most amps attempt to be voltage sources, even tubes. Their output impedance is high, not infinite. The AR 75 I used as an example is like this.

Having said this, there has been some interesting work done on making speakers for current sources. Nelson Pass has posted a number of hypotheticals online about this.

Best,

E
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Old 31st December 2017, 04:48 PM   #19
montana1 is offline montana1  United States
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Hi Lojzek,
Thanks for your post here! I will try to get my hands on the book you referenced. Very nice amplifier you built BTW!

Happy New Year,
Rich
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Old 31st December 2017, 04:57 PM   #20
montana1 is offline montana1  United States
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Hi OllBoll,
Thanks for taking the time to share your thoughts! I will continue to research and gain more knowledge on the subject of amplifier/ loudspeaker relationship.

Happy New Year,
Rich
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