604-8G in 620 cabinet - Bass responce
Good day @ all
I have built a pair of 620 cabinets for my 604-8Gs but the bass is less than satisfying. Especially the mid bass is nowhere leaving the mid band hanging with no authority. Some very low bass <60 is there but that is all.
Calculating using TS parameters of the speaker, the cabinet suited is about 100liters!!! less than the 620. The result calculates at about 150liters and not 250 of the 620.
Where is the mistake?
Thanks in advance
amplifier output impedance
Hello,
Perhaps your problem is related to amplifier output impedance. The vintage Altec designs were suited to vintage amplifiers which in general had output impedance of some ohms (not zero). You could rerun your simulation with non zero source impedance which will increase Qes. If you need the equation it is available in Small's AES paper or I can look it up for you.
If you prefer to experiment you can put 4 or 8 ohms in series with your speaker and listen for any changes. The resistor will dissipate some watts so be sure to use a resistor with enough dissipation.
Tom